Anatomy study note · Upper limb

Triceps brachii

The three-headed muscle filling the back of the arm; the main extensor of the elbow.

Key points

• Long: infraglenoid tubercle; lateral: above the radial groove; medial: below it.
• → olecranon.
• Radial nerve (C6, 7, 8).
• Elbow extension; triceps jerk = C6, 7, 8 (mainly C7).
• 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 · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 306, 357–358
• 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

• Ulna
• Ulnar artery
• Ulnar nerve
• Veins of the hand
• Wrist joint
• Abductor pollicis longus
• Acromioclavicular joint
• Adductor pollicis
• Anconeus
• Axillary artery
• Axillary lymph nodes
• Axillary nerve

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