Anatomy study note · Head and neck

Inferior rectus

An extraocular muscle that depresses the cornea and turns it medially.

Key points

• Tendinous ring → bottom of the eyeball.
• CN III.
• Down and in; test: look out, then down.
• Trapped in orbital floor blowout fracture.
• Oculomotor muscles: somitomeres 1–2.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

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

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 12, PDF pp. 1574–1575, 1589–1593, 1602
• Inderbir Singh’s Human Embryology, ch. 7, PDF p. 109; ch. 9, PDF p. 126
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the head and neck

• Insula
• Internal capsule
• Internal carotid artery
• Internal jugular vein
• Iris
• Lacrimal apparatus
• Laryngeal membranes and ligaments
• Larynx
• Lateral cricoarytenoid
• Lateral pterygoid
• Lateral rectus
• Lens

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