Anatomy study note · Upper limb

Brachialis

The deep muscle on the front of the lower arm. It is the main flexor of the elbow in every position of the forearm.

Key points

• Lower anterior humerus → coronoid process / ulnar tuberosity.
• Musculocutaneous (+ small radial branch).
• Flexes the elbow in every forearm position.
• Forms 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, 306
• 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

• Brachioradialis
• Breast
• Carpal bones
• Cephalic vein
• Clavicle
• Coracobrachialis
• Deltoid
• Dorsal scapular nerve
• Elbow joint
• Extensor carpi radialis brevis
• Extensor carpi radialis longus
• Extensor carpi ulnaris

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