Head & Neck anatomy: Suprahyoid muscles PDF

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Summary

Head & Neck anatomy: Suprahyoid muscles - origin, insertion, innervation and action...

Description

Supra Suprahy hy hyoid oid muscle Mylohy Mylohyoid oid

origin

insertion

innerv innervation ation

Mylohyoid line of mandible

Nerve to mylohyoid = branch of IAV (from posterior division of CNVc). Hyoid bone Runs in mylohyoid groove C1 cervical spinal nerve VIA hypoglossal nerve (CNXII)

Genioh Geniohyoid yoid

Inferior mental spine of mandible

Styloh Stylohyoid yoid

Styloid process of temporal bone

Facial nerve (CNVII): stylohyoid branch

Digastric

Anterior belly: anterior internal surface of mandible

Anterior belly: nerve to mylohyoid

Posterior belly: mastoid notch of temporal bone

Posterior belly: facial nerve – digastric branch

Bellies meet as they pass through the fascial sling

action Elevates hyoid bone, floor of mouth & tongue during swallowing and speaking Pulls hyoid anterosuperiorly Shortens floor of mouth Wides pharynx – aid swallowing Elevates & retracts hyoid – elongates floor of mouth Works with infrahyoid musclesDepresses mandible against resistance Elevates & steadies hyoid during swallowing & speaking

HEAD & NECK ANA ANAT TOMY - Suprah Suprahyoid yoid muscles * superior to hyoid bone *insert onto hyoid bone *elevate hyoid bone during swallowing to aid expansion of oesophagus...