Anatomy study note · Upper limb

Pronator quadratus

A small square muscle lying deep in the lower forearm, across the front of the radius and ulna.

Key points

• Lower anterior ulna → lower anterior radius.
• Anterior interosseous nerve.
• Main pronator.
• 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 p. 308
• 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

• Pronator teres
• Radial artery
• Radial nerve
• Radioulnar joints and interosseous membrane
• Radius
• Rhomboid major
• Rhomboid minor
• Scapula
• Serratus anterior
• Shoulder joint
• Sternoclavicular joint
• Subclavius

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