Anatomy study note · Upper limb

Supinator

A deep muscle wrapped around the upper radius. The deep branch of the radial nerve passes through it to become the posterior interosseous nerve.

Key points

• Lateral epicondyle + anular ligament + ulna → neck/shaft of the radius.
• Deep radial nerve pierces it.
• Supination (with biceps).
• Part of the floor of the cubital fossa.
• Limb muscles: in situ from limb-bud mesenchyme.
• Upper limb bud C4–T2; lower limb bud L2–S2.
• 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. 3, PDF pp. 274, 309
• Inderbir Singh’s Human Embryology, ch. 7, PDF p. 109; ch. 10, PDF pp. 142–145
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the upper limb

• Suprascapular nerve
• Supraspinatus
• Supratrochlear (cubital) lymph node
• Teres major
• Teres minor
• Thenar muscles
• Thoracodorsal nerve
• Trapezius
• Triceps brachii
• Ulna
• Ulnar artery
• Ulnar nerve

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