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LETTER TO THE EDITOR
Year : 2014  |  Volume : 2  |  Issue : 3  |  Page : 234

Should Mylohyoid Muscle be Considered a True Partition Between the Sublingual and Submandibular Fossae?


Department of Anatomy, Melaka Manipal Medical College, Manipal University, Madhavnagar, Manipal, Karnataka, India

Date of Web Publication11-Oct-2014

Correspondence Address:
Srinivasa R Sirasanagnadla
Department of Anatomy, Melaka Manipal Medical College (Manipal Campus), Manipal University, Madhavnagar, Manipal - 576 104, Karnataka
India
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DOI: 10.4103/1658-631X.142583

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How to cite this article:
Sirasanagnadla SR, Nayak SB. Should Mylohyoid Muscle be Considered a True Partition Between the Sublingual and Submandibular Fossae?. Saudi J Med Med Sci 2014;2:234

How to cite this URL:
Sirasanagnadla SR, Nayak SB. Should Mylohyoid Muscle be Considered a True Partition Between the Sublingual and Submandibular Fossae?. Saudi J Med Med Sci [serial online] 2014 [cited 2019 Jul 19];2:234. Available from: http://www.sjmms.net/text.asp?2014/2/3/234/142583

Sir,

Mylohyoid muscle is one of the suprahyoid muscles situated in the floor of the mouth. This triangular muscle arises from the mylohyoid line of the mandible. Major part of the muscle meets the mylohyoid muscle of the opposite side and forms a continuous muscular sheath. Posterior part of the muscle is inserted to the body of the hyoid bone. Classically, mylohyoid muscle is considered as a muscular partition between the sublingual and submandibular fossae. The sublingual fossa is situated above and medial to the mylohyoid muscle and it contains sublingual gland, deep part of the submandibular gland, Wharton's duct, lingual nerve and lingual vessels. It communicates with the submandibular fossa at the posterior border of the muscle. [1] Mylohyoid muscle is often shown to present defects. In previous studies incidence of defects in the mylohyoid muscles is found to be 35-50%. [2],[3],[4],[5] Standring et al. [1] have mentioned that hiatus in the mylohyoid is present in about one-third of subjects. However, in one of the cadaveric studies, the incidence was 10%. [6] This is the lowest incidence of mylohyoid defects that has been reported in the literature.

The defects in the mylohyoid are usually occupied by the sublingual gland, or fat and blood vessels. The defects and their contents of the mylohyoid can be detected by computed tomography, magnetic resonance imaging and ultrasound. [7] Mylohyoid muscle plays a key role during the oral imaging and while performing the surgical procedures in the sublingual fossa or floor of the mouth. Though standard anatomy textbooks have described mylohyoid muscle as oral diaphragm forming continuous sheath, it is not found in approximately half of the population. Further, the defects in the muscle may not impair its action in elevating the floor of the mouth and depressing the mandible. Based on the above facts, defect of mylohyoid can be considered as normal opening. Hence it is not appropriate to say that the submandibular and sublingual fossae are separated from each other by the mylohyoid.

 
  References Top

1.
Standring S, Borley NR, Collins P, Crossman AR, Gatzoulis MA, Healy JC, et al. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 40 th ed., Vol. 1198. London: Elsevier, Churchill Livingstone; 2008. p. 501.  Back to cited text no. 1
    
2.
Gaughran GR. Mylohyoid boutonni'ere and sublingual bouton. J Anat 1963;97:565-8.  Back to cited text no. 2
    
3.
Nathan H, Luchansky E. Sublingual gland herniation through the mylohyoid muscle. Oral Surg Oral Med Oral Pathol 1985;59:21-3.  Back to cited text no. 3
    
4.
Engel JD, Harn SD, Cohen DM. Mylohyoid herniation: Gross and histologic evaluation with clinical correlation. Oral Surg Oral Med Oral Pathol 1987;63:55-9.  Back to cited text no. 4
    
5.
Windisch G, Weiglein AH, Kiesler K. Herniation of the mylohyoid muscle. J Craniofac Surg 2004;15:566-9.  Back to cited text no. 5
    
6.
Castelli WA, Huelke DF, Celis A. Some basic anatomic features in paralingual space surgery. Oral Surg Oral Med Oral Pathol 1969;27:613-21.  Back to cited text no. 6
    
7.
Otonari-Yamamoto M, Nakajima K, Tsuji Y, Otonari T, Curtin HD, Okano T, et al. Imaging of the mylohyoid muscle: Separation of submandibular and sublingual spaces. AJR Am J Roentgenol 2010;194:W431-8.  Back to cited text no. 7
    




 

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