Mylohyoid nerve explained

Mylohyoid nerve
Latin:nervus mylohyoideus
Innervates:Mylohyoid muscle, anterior belly of digastric muscle
Branchfrom:Inferior alveolar nerve

The mylohyoid nerve (or nerve to mylohyoid) is a mixed nerve of the head. It is a branch of the inferior alveolar nerve. It provides motor innervation the mylohyoid muscle, and the anterior belly of the digastric muscle. It provides sensory innervation to part of the submental area, and sometimes also the mandibular (lower) molar teeth, requiring local anaesthesia for some oral procedures.

Structure

Origin

The mylohyoid nerve is a mixed (motor-sensory) branch of the inferior alveolar nerve (which is a branch of the mandibular nerve (CN V3) that is itself a branch of the trigeminal nerve (CN V)).[1] [2] It arises just before it enters the mandibular foramen.

Course

It pierces the sphenomandibular ligament.[3] It descends in a groove on the deep surface of the ramus of the mandible. When it reaches the under surface of the mylohyoid muscle, it gives branches to the mylohyoid muscle and the anterior belly of the digastric muscle.

Distribution

Motor

The mylohyoid nerve supplies the mylohyoid muscle and the anterior belly of the digastric muscle.

Sensory

It provides sensory innervation to the skin of the centre of the submental area.[4] It may also provide some sensory innervation to the mandibular (lower) molar teeth.[5]

Clinical significance

The mylohyoid nerve needs to be blocked during local anaesthesia of the mandibular (lower) teeth to prevent pain during oral procedures.[6] It may not be anaesthetised during a block of the inferior alveolar nerve, causing pain.

References

  1. Book: Hallinan. James T. P. D.. https://www.sciencedirect.com/science/article/pii/B9780323485630000039. Skull Base Imaging. Sia. David S. Y.. Yong. Clement. Chong. Vincent. Elsevier. 2018. 978-0-323-48563-0. 39–64. en. Chapter 3 - The Sphenoid Bone. 10.1016/B978-0-323-48563-0.00003-9.
  2. Bennett. Sam. Townsend. Grant. 2001. Distribution Of The Mylohyoid Nerve: Anatomical Variability And Clinical Implications. Australian Endodontic Journal. en. 27. 3. 109–111. 10.1111/j.1747-4477.2001.tb00470.x. 12360663 . 1747-4477.
  3. Book: Sinnatamby, Chummy S. . Last's Anatomy . 2011 . 978-0-7295-3752-0 . 12th . 364.
  4. Iwanaga . Joe . Ibaragi . Soichiro . Okui . Tatsuo . Divi . Vasu . Ohyama . Yoshio . Watanabe . Koichi . Kusukawa . Jingo . Tubbs . R. Shane . 2022-08-01 . Cutaneous branch of the nerve to the mylohyoid muscle: Potential cause of postoperative sensory alteration in the submental area . Annals of Anatomy - Anatomischer Anzeiger . en . 243 . 151934 . 10.1016/j.aanat.2022.151934 . 35307555 . 247543350 . 0940-9602.
  5. Book: Ferneini . Elie M. . https://www.sciencedirect.com/science/article/pii/B9780323289450000326 . Head, Neck, and Orofacial Infections - A Multidisciplinary Approach . Bennett . Jeffrey D. . . 2016 . 978-0-323-28945-0 . 422–437 . en . 32 - Anesthetic Considerations in Head, Neck, and Orofacial Infections . 10.1016/B978-0-323-28945-0.00032-6.
  6. Book: Gulabivala. K.. https://www.sciencedirect.com/science/article/pii/B9780702031557000102. Endodontics. Ng. Y.-L.. Mosby. 2014. 978-0-7020-3155-7. 4th. 264–284. en. 10 - Management of acute emergencies and traumatic dental injuries. 10.1016/B978-0-7020-3155-7.00010-2.

External links

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Mylohyoid nerve".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.