posterior antebrachium n.
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POSTERIOR ANTEBRACHIUM. Extensor Retinaculum. Deep fascia Transversely crosses distal ends of radius and ulna. Extensor Retinaculum. Converts grooves in radius into tunnels for extensor tendons (lateral to medial): Abductor pollicis longus Extensor pollicis brevis Styloid process

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extensor retinaculum
Extensor Retinaculum
  • Deep fascia
  • Transversely crosses distal ends of radius and ulna.
extensor retinaculum1
Extensor Retinaculum
  • Converts grooves in radius into tunnels for extensor tendons (lateral to medial):

Abductor pollicis longus

Extensor pollicis brevis

Styloid process

Extensor carpi radialis longus

Extensor carpi radialis brevis

Dorsal tubercle

Extensor pollicis longus

Extensor digitorum and extensor indicis

radial nerve
Radial Nerve
  • Pierces lateral intermuscular septum in lower arm and enters antebrachium between brachioradialis and brachialis muscles.
  • Passes in front of lateral epicondyle and enters cubital fossa.
  • Divides into superficial and deep branches.
radial nerve deep branch
Radial Nerve Deep Branch
  • Wraps laterally around radius between superficial and deep layers of supinator.
  • = posterior interosseous nerve.
  • Runs with posterior interosseous artery.
  • Motor to all extensor muscles of the forearm except extensor carpi radialis longus and anconeus.
radial nerve superficial branch
Radial Nerve Superficial Branch
  • Cutaneous.
  • Accompanies radial artery proximally.
  • Emerges from beneath brachioradialis in distal forearm.
  • Supplies lateral half of dorsum of hand and dorsum of thumb and index finger.
radial artery
Radial Artery
  • Smallest terminal branch of brachial artery.
  • Proximally lies deep to brachioradialis.
  • Distally becomes superficial between brachioradialis and flexor carpi radialis.
  • Winds dorsally through anatomical snuff-box.
radial artery branches
Radial Artery Branches
  • Radial recurrent
  • Dorsal carpal artery
  • Dorsal metacarpal and digital arteries
  • First dorsal metacarpal:

Princeps pollicis

Radialis indicis

interosseous arteries
Interosseous Arteries
  • From common interosseous artery from ulnar artery.
  • One on either side of interosseous membrane.
superficial muscles
Superficial Muscles
  • Primarily wrist and hand extensors
  • Common origin = lateral epicondyle:

Superior to inferior:

Brachioradialis

Extensor carpi radialis longus

Extensor radialis brevis

Extensor digitorum (communis)

Extensor digiti minimi

Extensor carpi ulnaris

deep muscles
DeepMuscles
  • Four muscles emerge from antebrachium between extensor carpi radialis muscles and the extensor digitorum muscle.

Three outcropping muscles insert on thumb:

Abductor pollicis longus

Extensor pollicis brevis

Extensor pollicis longus

Extensor indicis.

  • Supinator