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Sternocleidomastoid muscle can have multiple attachments

Nayak SB, Soumya KV

Surg Radiol Anat, 2020 06;42(6):717.
PMID: 31984433 DOI: 10.1007/s00276-020-02418-6
Matched MeSH terms: Neck Muscles*
Fulltext Bilateral isolated mylohyoid groove fracture progressing as submandibular abscess: an usual fracture pattern of mandible

Rajaran JR, Nazimi AJ

BMJ Case Rep, 2021 Mar 17;14(3).
PMID: 33731407 DOI: 10.1136/bcr-2020-239542

The mylohyoid ridges or lines are pairs of anatomical bony structures located on the internal or lingual surface of mandible. They are the origin for the mylohyoid muscle. These bony structures are distinct in the mandibular molar region, well protected and gradually become undiscernible towards anterior mandible. Bilateral, isolated fracture of the mylohyoid ridges without concomitant mandibular fracture is rare and, to the best of the authors knowledge, was never previously described. This case report describes an isolated bilateral mylohyoid groove fracture, where one side of a necrotic bone fragment at the fracture site progress to became a nidus of infection, which later caused submandibular space abscess requiring emergency surgical intervention. Diagnosis, possible theory to explain the occurrence of isolated mylohyoid groove fracture and management of these condition are explained in this report.

Matched MeSH terms: Neck Muscles/surgery
The fourth case of Sarcocystis infection in man in Malaysia

Prathap K, Dissanaike AS

Southeast Asian J. Trop. Med. Public Health, 1978 Sep;9(3):452-3.
PMID: 107599
Matched MeSH terms: Neck Muscles/parasitology; Neck Muscles/pathology
Effects of using a document holder when typing on head excursion and neck muscle activity among computer users with and without neck pain

Subramaniam A, Singh DKA

Int J Occup Saf Ergon, 2021 Mar;27(1):48-54.
PMID: 30465482 DOI: 10.1080/10803548.2018.1543101

Purpose. The aim of this study was to examine the effects of using a document holder while typing on head excursion and neck muscle activity among computer users with and without neck pain. Method. An experimental study including 52 individuals with (n = 26) and without (n = 26) neck pain was conducted. Head excursion and neck muscle activity were measured using an accelerometer and surface electromyography, respectively. Two-way analysis of variance was conducted to examine the effects of using a document holder between computer users with and without neck pain. Results. The results demonstrated a decrease in head excursion (p neck pain had significantly (p neck pain. Conclusion. The results of the study supported the use of a document holder to assist in decreasing head excursion and neck muscle activity. The use of a document holder while typing may be beneficial in preventing repetitive strain injuries among computer users.

Matched MeSH terms: Neck Muscles*
Fulltext Sternocleidohyoid muscle: an unreported variant of cleidohyoid muscle

Nayak SB, Shetty SD

Surg Radiol Anat, 2021 Aug;43(8):1327-1330.
PMID: 33527215 DOI: 10.1007/s00276-021-02682-0

Sternohyoid, sternothyroid, omohyoid, and thyrohyoid muscles are collectively known as infrahyoid muscles. These muscles frequently show variations in their attachments. Here, an extremely rare variant muscle belonging to this group has been presented. During cadaveric dissection for undergraduate medical students, an additional muscle was found between sternohyoid and superior belly of omohyoid muscles bilaterally in a male cadaver aged approximately 70 years. This muscle took its origin from posterior surface of the manubrium sterni, capsule of the sternoclavicular joint and the posterior surface of the medial part of the clavicle. It was inserted to the hyoid bone between the attachments of sternohyoid and superior belly of omohyoid muscles and was supplied by a branch of ansa cervicalis profunda. There is no report on such a muscle in the literature and it could be named as "sternocleidohyoid muscle". Knowledge of this muscle could be useful in neck surgeries.

Matched MeSH terms: Neck Muscles/abnormalities*
Myopathic dropped head syndrome: a syndrome of mixed aetiology

Goh KJ, Wong KT, Tan CT

J Clin Neurosci, 2000 Jul;7(4):334-6.
PMID: 10938615

We report two patients with myopathic dropped head syndrome, a rare and interesting neuromuscular syndrome characterised by a predominant weakness of the neck extensor muscles. The first patient, a middle aged Chinese man, presented with progressive weakness of neck extension but his clinical course later stabilised despite a lack of response to corticosteroids. Muscle biopsy revealed a necrotising myopathy with no evidence of inflammation. This patient supports the existence of an idiopathic restricted non-inflammatory myopathy, a so called isolated neck extensor myopathy syndrome which is recognised to pursue a less progressive, more benign course. Our second patient had histopathological evidence for polymyositis; there was a favourable response to steroids. Our cases underscore the fact that there may be a spectrum of pathological processes associated with the myopathic dropped head syndrome ranging from non-inflammatory muscle necrosis to a full blown inflammatory myositis.

Matched MeSH terms: Neck Muscles/pathology*; Neck Muscles/physiopathology
Localization of the motor neuron somata of geniohyoid muscle in rat: A horseradish peroxidase study

Razlan ANB, Ullah M, Kapitonova MY, Liaqat Ali Khan NB, Fuad SBSA

Anat Histol Embryol, 2018 Oct;47(5):410-416.
PMID: 29888399 DOI: 10.1111/ahe.12372

The aim of the study was to investigate the location of motor neuron somata of geniohyoid muscle in rat. Nine Sprague-Dawley rats were used in this study. Operations were performed under general anaesthesia. Nembutal sodium, 40 mg per kg intraperitoneally was used for anaesthesia. 0.02 to 0.05 ml of 30% horseradish peroxidase (Sigma Type VI) solution in normal saline was injected into the exposed right geniohyoid muscle. After 48 hr, the animals were fixed by perfusion through left ventricle of heart, first by 100 ml normal saline and then with 500 ml of 1.25% glutaraldehyde and 1% paraformaldehyde in 0.1 M phosphate buffer, pH 7.4, at room temperature, and finally with 500 ml of 10% sucrose in the same buffer at 4°C. The medulla oblongata and first cervical segment of spinal cord were removed, kept in 10% sucrose in above phosphate buffer at 4°C for 24 hr. Thereafter, their serial transverse sections were cut in a cryostat at a thickness of 60 μm. The sections were treated according to tetramethyl benzidine (TMB)-horseradish peroxidase (HRP) method. HRP-labelled neuron somata were observed at the following sites: (a) In ventral part of right main hypoglossal nucleus in upper two-thirds of the closed part of medulla oblongata. (b) In ventrolateral subnucleus of hypoglossal nucleus in lower third of closed part of medulla oblongata. (c) At spinomedullary junction, they were located in dorsomedial part of right ventral grey column; a few were also seen here scattered on right side of central canal and among corticospinal fibres.

Matched MeSH terms: Neck Muscles/anatomy & histology*; Neck Muscles/innervation*
Fulltext An acute pharyngeal-cervical-brachial (PCB) variant of Guillain-Barre syndrome presenting with isolated bulbar palsy

Hamidon BB

Med J Malaysia, 2006 Jun;61(2):245-7.
PMID: 16898323 MyJurnal

Acute Guillain-Barre syndrome (GBS) is characterized by an acute onset of limb weakness and areflexia. There are a few rare variants that have been described and one of them is the pharyngeal-cervical-brachial (PCB) variant (oropharynx, neck, and proximal upper limb muscles). However, in this patient, the only presentation was bulbar involvement with fast recovery within days. This is likely to be the milder form of PCB that has rarely been described before. A 19-year-old Malay lady presented with progressive dysphagia associated with nasal voice for one week duration. There was no limb weakness. Examination showed generalized areflexia. Pharyngeal and palatal muscles were markedly weak. Cerebrospinal fluid (CSF) examination showed raised protein level. Nerve conduction studies revealed generalized demyelinating motor polyneuropathy consistent with GBS. The patient fully recovered within three days and was discharged well.

Matched MeSH terms: Neck Muscles/innervation; Neck Muscles/physiopathology
Position of document holder and work related risk factors for neck pain among computer users: a narrative review

Ambusam S, Baharudin O, Roslizawati N, Leonard J

Clin Ter, 2015 Nov-Dec;166(6):256-61.
PMID: 26794814 DOI: 10.7417/CT.2015.1898

Document holder is used as a remedy to address occupational neck pain among computer users. An understanding on the effects of the document holder along with other work related risk factors while working in computer workstation requires attention. A comprehensive knowledge on the optimal location of the document holder in computer use and associated work related factors that may contribute to neck pain reviewed in this article. A literature search has been conducted over the past 14 years based on the published articles from January 1990 to January 2014 in both Science Direct and PubMed databases. Medical Subject Headings (MeSH) keywords for search were neck muscle OR head posture OR muscle tension' OR muscle activity OR work related disorders OR neck pain AND/OR document location OR document holder OR source document OR copy screen holder.Document holder placed lateral to the screen was most preferred to reduce neck discomfort among occupational typists. Document without a holder was placed flat on the surface is least preferred. The head posture and muscle activity increases when the document is placed flat on the surface compared to when placed on the document holder. Work related factors such as static posture, repetitive movement, prolong sitting and awkward positions were the risk factors for chronic neck pain. This review highlights the optimal location for document holder for computer users to reduce neck pain. Together, the importance of work related risk factors for to neck pain on occupational typist is emphasized for the clinical management.

Matched MeSH terms: Neck Muscles
Fulltext Intramuscular haemangioma of the masseter muscle: a case report

Ahmad Sahril Hussin, Nik Azrizie Muhamed, Haryati Husin, Irfan Mohamad

Archives of Orofacial Sciences, 2018;13(1):41-44.
MyJurnal

Intramuscular haemangioma is relatively rare and accounts for less than 1% of all haemangioma.
Most of these tumours occur in the trunk, arms and legs. Only 14% of all intramuscular haemangioma arise
from the head and neck region, with masseter muscle representing the most common site of involvement,
followed by the trapezius and sternocleidomastoid muscles. We present a case of a 60-year-old man with a
soft lump in the left cheek. Imaging of the neck showed irregular, dilated enhancing vessels seen in the left
masseter muscle suggestive of intramuscular haemangioma. Excisional biopsy was performed, and
histopathological findings confirmed the diagnosis.

Matched MeSH terms: Neck Muscles
Fulltext Mylohyoid foramen of mandible: a rare exit point of intra-mandibular origin of nerve to mylohyoid

Nayak SB, Soumya KV

Anat Cell Biol, 2020 Mar;53(1):114-116.
PMID: 32274257 DOI: 10.5115/acb.19.186

Nerve to mylohyoid is a branch of inferior alveolar nerve. It arises in the infratemporal fossa and runs in the mylohyoid groove of mandible to reach the submandibular region, where it supplies the anterior belly of digastric and mylohyoid muscles. Though sensory distribution of this nerve have been described, it is predominantly a motor nerve. Here, a rare intra-mandibular origin of nerve to mylohyoid has been presented. This nerve arose from the inferior alveolar nerve inside the mandible and came out to the submandibular region by passing through a small foramen present on the medial surface of the body of the mandible. It ended by supplying the anterior belly of digastric and mylohyoid muscles. The knowledge of this variation could be of importance to maxillofacial surgeons and radiologists.

Matched MeSH terms: Neck Muscles
Morphometrics of nuchal ligament in greyhound in different neck and body positions

Ismail SMY, Murray CM, Olusa TAO, Ismail MM, Hailat NQ, Yen HH, et al.

Anat Histol Embryol, 2022 Jan;51(1):143-152.
PMID: 34882828 DOI: 10.1111/ahe.12771

This study was conducted to describe the morphometrics of nuchal ligament and investigate the effects of different neck and body positions on the nuchal ligament in greyhounds. Nine adult greyhounds cadavers without any locomotion abnormalities were dissected through the neck musculature on the left side to expose the nuchal ligament. Three pins were placed to mark regions of interest on the nuchal ligament: at one cm cranial to the site of origin (the most dorsal point of the spinous process of the first thoracic vertebra), at the midpoint of the nuchal ligament and one cm caudal to the nuchal ligament site of insertion (close to the caudal aspect of the spinous process of the axis). Each cadaver was positioned on a masonite board and placed on a table on the floor in their lateral recumbency and seven different standardized body positions; P1-P7 were mimicked using goniometers and metal wires. Photographs were taken by positioning and fixing the camera above the nuchal ligament region. The length and widths (W1, W2 and W3) of nuchal ligament were measured using Image Pro software (Image-Pro Express version 5.0) on standardized photographs of each of seven different body and neck positions. The length of nuchal ligament in relation to the neutral position (P1) was less (- 7%, p > 0·05) in P6 (neck elevated) and increased in all other positions (+1%, p > 0·05 for P2, +19%, p 0·05 for P5, +40%, p neck and body positions change the shape, and hence, the function of the nuchal ligament during movement.

Matched MeSH terms: Neck Muscles
Prolonged writing task: comparison of electromyographic analysis of upper trapezius muscle in subjects with or without neck pain

Leonard JH, Kok KS, Ayiesha R, Das S, Roslizawati N, Vikram M, et al.

Clin Ter, 2010;161(1):29-33.
PMID: 20393675

Work related musculoskeletal disorders represent a serious public health problem as it is a leading cause for disability and absenteeism in workers. The main purpose of the present quasi-experimental study was to compare the muscle activity of the upper trapezius in subjects with neck pain and compare it to those of normal subjects.

Study site: Pusat Perubatan Universiti Kebangsaan Malaysia (PPUKM)

Matched MeSH terms: Neck Muscles/physiopathology*
Localization of the spinal nucleus of accessory nerve in rat: a horseradish peroxidase study

Ullah M, Mansor O, Ismail ZI, Kapitonova MY, Sirajudeen KN

J Anat, 2007 Apr;210(4):428-38.
PMID: 17428204

The spinal nucleus of the accessory nerve (SNA) comprises the group of somata (perikarya) of motor neurons that supply the sternocleidomastoid and trapezius muscles. There are many conflicting views regarding the longitudinal extent and topography of the SNA, even in the same species, and these disagreements prompted the present investigation. Thirty Sprague-Dawley rats (15 males, 15 females) were used. The SNA was localized by retrograde axonal transport of horseradish peroxidase. Longitudinally, the SNA was found to be located in the caudal part (caudal 0.9-1.2 mm) of the medulla oblongata, the whole lengths of cervical spinal cord segments C1, C2, C3, C4, C5 and rostral fourth of C6. In the caudal part of the medulla oblongata, the SNA was represented by a group of perikarya of motor neurons lying immediately ventrolateral to the pyramidal fibres that were passing dorsolaterally after their decussation. In the spinal cord, the motor neuronal somata of the SNA were located in the dorsomedial and central columns at C1, in the dorsomedial, central and ventrolateral columns at C2 and in the ventrolateral column only at C3, C4, C5 and rostral quarter of C6. The perikarya of motor neurons supplying the sternocleidomastoid were located in the caudal part (caudal 0.9-1.2 mm) of the medulla oblongata ventrolateral to the pyramidal fibres that were passing dorsolaterally after their decussation. They were also located in the dorsomedial and central columns at C1, in the dorsomedial, central and ventrolateral columns at C2 and only in the ventrolateral column at the rostral three-quarters of C3. The perikarya of motor neurons supplying the trapezius muscle were located in the ventrolateral column only in the caudal three-quarters of C2, the whole lengths of C3, C4 and C5, and in the rostral quarter of C6.

Matched MeSH terms: Neck Muscles/innervation
Fulltext Acute Retropharyngeal Calcific Tendonitis as a Rare Cause of Odynophagia and Neck Pain

Singh PKM, Noor MIM, Jaafar R, Ahmad A, Mohamad I

Medeni Med J, 2021;36(1):75-79.
PMID: 33828894 DOI: 10.5222/MMJ.2021.37539

Retropharyngeal calcific tendonitis (RCT) is an aseptic inflammatory process of the superior oblique tendons of the longus colli muscle caused by the deposition of calcium hydroxyapatite crystals. We reported a 23-year-old woman who presented with a sudden onset of neck pain with odynophagia after waking up from sleep. Physical examination showed paracervical point tenderness with limited neck movement in all directions. Prior to surgery, further imaging was requested to aid in diagnosis, which in turn revealed RCT. It is important to be aware that RCT presentation may mimic other severe conditions such as retropharyngeal space abscess or meningitis.

Matched MeSH terms: Neck Muscles
Fulltext Prognostic Factors in Recurrent Congenital Muscular Torticollis

Chotigavanichaya C, Phongprapapan P, Wongcharoenwatana J, Eamsobhana P, Ariyawatkul T, Kaewpornsawan K

Malays Orthop J, 2021 Mar;15(1):43-47.
PMID: 33880147 DOI: 10.5704/MOJ.2103.007

Introduction: Congenital muscular torticollis (CMT), primarily resulting from unilateral shortening and fibrosis of the sternocleidomastoid muscle. One of the common surgical complications is recurrent deformity. However, the associations between unipolar or bipolar release, age of the patient, and the recurrence of the disease are unclear. Therefore, the purpose of this study was to evaluate the factors associated with recurrence after surgery.
Materials and Methods: A retrospective review was performed in 47 patients who were diagnosed with CMT and had been treated surgically with unipolar or bipolar release between January 2007 and December 2015. Demographic data (sex, sides, surgical technique, age at time of surgery, period of follow-up, complications and recurrence) were recorded.
Results: Forty-seven patients with an average age of 8.7 years old at time of surgery. Twenty-six patients had right-sided muscular torticollis, while 21 had left-sided. The average follow-up time was 2 years (range, 2-4 years). The average age of unipolar release was 8.8 years old (range, 218 years old), while the average age of bipolar release was 8.7 years old (range, 2-13 years old). Recurrence occurred in 11 patients (9 in unipolar and 2 in bipolar release). Sex, side of deformity, type of surgery and age at time of surgery showed no statistically significant as a factor for recurrence rate, however recurrence of unipolar more than bipolar surgery was nearly two times revealing clinical significance.
Conclusions: Sex, side of deformity, type of surgery and age at time of surgery were not associated with the recurrence deformity.

Matched MeSH terms: Neck Muscles
Concurrent validity and reliability of telerehabilitation-based physiotherapy assessment of cervical spine in adults with non-specific neck pain

Mani S, Sharma S, Singh DK

J Telemed Telecare, 2021 Feb;27(2):88-97.
PMID: 31272309 DOI: 10.1177/1357633X19861802

INTRODUCTION: The aim of this study was to determine the concurrent validity and reliability of telerehabilitation (TR)-based evaluation of the cervical spine among adults with non-specific neck pain (NS-NP).
METHODS: A total of 11 participants with NS-NP were recruited. Pain intensity, active range of motion (AROM), posture, deep neck flexor (DNF) endurance, combined neck movements and disability were measured using face-to-face and TR methods, with a one-hour break in between. TelePTsys, an image-based TR system, was used for TR assessment.
RESULTS: A high degree of concurrent validity for pain (bias = 0.90), posture (bias = 0.96°), endurance (bias = -2.3 seconds), disability (bias = 0.10), AROM (extension bias = -0.60 cm, flexion bias = 1.2 cm, side flexion bias = -1.00, rotation bias = -0.30 cm) was found. Standard error of measurement and coefficient of variation (CV) values were within the acceptable level for concurrent validity, except the CV for cervical flexion and endurance. There was a high degree of reliability demonstrated for pain, posture, AROM, endurance and disability measurements. The average-measure interclass correlation coefficient (ICC(3,1)) ranged from 0.96 to 0.99 for inter-rater, and 0.93 to 0.99 for intra-rater reliabilities. There was moderate agreement for combination movement for validity (78.5%, p neck posture and disability among adults with NS-NP via telePTsys.

Matched MeSH terms: Neck Muscles
Fulltext A survey among guardians on child restraint system (CRS) usage In central peninsular Malaysia

Noor Faradila, P., Aqbal Hafeez, A., Azhar, H., Rohayu, S., Akmalia, S., Mohd Syazwan, S., et al.

Malaysian Journal of Public Health Medicine, 2016;16(101):1-6.
MyJurnal

Children are much more likely than adults to get serious injuries in car crashes due to their softer bones, weaker neck muscle and fragile bodies. Child restraint system (CRS) can help in reduce injury and prevent fatality in the event of a crash. Thus the aim of this paper is to gauge the prevalence of CRS usage among guardians of children age below 11 years old. A survey to addressed guardians knowledge on CRS usage, practice and their views on fitting child restraints system to their vehicles were carried out among parents and carers who are caring children aged 11 years old and below. Seventy-four percent (74%) out of 500 respondents cited they have used CRS, however only 40% of them is currently using CRS with their children. Respondent in Kuala Lumpur and younger guardians reported twice likely to use CRS. In addition, graduate respondents are 1.5 times more likely to use CRS for their children. In conclusion, high incorrect usage rate and understanding of the CRS could promote additional injury towards the children in a car crash. Many initiatives could be introduced before the implementation of the CRS law in Malaysia such as awareness, community-based programs and CRS clinics that aim to guide guardians on the correct and effective way of installing the CRS device in their car.

Matched MeSH terms: Neck Muscles
Submental intubation - Practical alternative airway in maxillofacial surgeries

Lim D, Parumo R, Ma CB, Palasuntharam S

J Clin Anesth, 2017 09;41:97-98.
PMID: 28802621 DOI: 10.1016/j.jclinane.2017.07.001
Matched MeSH terms: Neck Muscles/surgery

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