Mylohyoid Space Division — MFDS Part 1 MCQ

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EasyAnatomy (Head & Neck)Mylohyoid Space DivisionMFDS Part 1

Which muscle forms the principal anatomical partition between the sublingual and submandibular spaces?

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Correct answer: D — Mylohyoid muscle

The correct answer is D, the mylohyoid muscle. It forms the principal muscular partition in the floor of the mouth: the sublingual space lies above it and the submandibular space lies below it. The separation is not completely sealed because the spaces may communicate around the posterior free border or through mylohyoid defects. Geniohyoid lies superior to mylohyoid and does not divide these spaces. Hyoglossus is an extrinsic tongue muscle forming a medial relation of the sublingual region. Buccinator forms the muscular wall of the cheek, while the superior pharyngeal constrictor contributes to the pharyngeal wall.

Reference: Lahiri AK, Daultrey CR. Imaging evaluation of the benign and malignant lesions of the floor of the mouth: Pictorial review. Anatomy of the floor of mouth and sublingual space. 2023. https://pubmed.ncbi.nlm.nih.gov/37693857/