Anatomy study note · Head and neck

Digastric

A two-bellied suprahyoid muscle whose intermediate tendon is held to the hyoid by a fascial sling.

Key points

• 2 bellies, 2 nerves: posterior VII, anterior V3.
• Intermediate tendon to the hyoid.
• Opens the mouth / raises the hyoid.
• Anterior belly: 1st arch (V3). Posterior belly: 2nd arch (VII).
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 12, PDF pp. 1616–1617
• Inderbir Singh’s Human Embryology, ch. 9, PDF pp. 122, 125
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the head and neck

• Dura mater
• Dural venous sinuses
• Epiglottis
• Ethmoid
• External carotid artery
• External ear
• External jugular vein
• External nose
• Eyelids and conjunctiva
• Facial bones of the orbit and nasal cavity
• Facial nerve
• Frontal bone

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