Anterior interosseous nerve

Anterior interosseous nerve
Nerves of the left upper extremity. (Volar interosseus labeled at center right.)
Deep palmar nerves. (Volar interosseous labeled at center top.)
Details
From	Median nerve
Identifiers
Latin	nervus interosseus antebrachii anterior
TA98	A14.2.03.034
TA2	6460
FMA	44822
Anatomical terms of neuroanatomy [edit on Wikidata]

The anterior interosseous nerve (volar interosseous nerve) is a branch of the

. Its nerve roots come from C8 and T1.

It accompanies the

.

Note that the median nerve supplies all flexor muscles of the forearm except for the ulnar half of

, which is a superficial muscle of the forearm.

Innervation

The anterior interosseous nerve classically innervates 2.5 muscles:

which are deep muscles of the forearm

• flexor pollicis longus
• pronator quadratus
• the radial (lateral) half of
  flexor digitorum profundus
  (inserting on the second and third digits)

and the inferior radioulnar, wrist and carpal joints.

Injury

A branch of the median nerve, the anterior interosseous nerve (AIN) can be affected by either direct penetrating injury, possibly compression in a fashion similar to carpal tunnel syndrome, but most commonly an idiopathic inflammatory process (referred to an

is similar, but involves both the AIN as well as the median nerve proper.

Clinical significance

Following

See also

• Carpal Tunnel Syndrome
• Posterior interosseous nerve

References

This article incorporates text in the public domain from page 938 of the 20th edition of Gray's Anatomy (1918)

External links

• Anterior interosseous branch of median nerve at the Duke University Health System's Orthopedics program
• EatonHand ner-071
• Image (see yellow arrow under "Findings")

Additional Images

• 
  Anterior interosseous nerve.Deep dissection.Anterior.