Human Anatomy Vol 1

Radial nerve

To brachioradialis

To extensor carpi

radialis longus

Superficial

terminal branch

To extensor carpi

radialis brevis

Short branches to:

Long lateral

branch to:

Extensor digitorum

Extensor digiti

mrntmt

Extensor carpi

ulnaris

Long medial branch to:

Abductor

pollicis longus

Extensor

pollicis brevis

Extensor polllcis

longus

Extensor indicis

Pseudoganglion

Termination of

nerve behind

wrist joint

Fig. 9.61 : Branches of the posterior interosseous nerve

c. After emerging from the supinator, the nerve
gives three short branches to:
i. The extensor digitorum.
ii. The extensor digiti minimi.
iii. The extensor carpi ulnaris.
It also gives two long branches.
i. A lateral branch supplies the abductor pollicis
longus and the extensor pollicis brevis.
ii. A medial branch supplies the extensor pollicis
longus and the extensor indicis.
B. Articulnr branches
Articular branches are given to:
i. The wrist joint.
ii. The distal radioulnar joint.
iii. Intercarpal and intermetacarpal joints.
C. Sensory branches
Sensory branches are given to the interosseous
membrane, the radius and the ulna.

POSTERIOR INTEROSSEOUS ARTERY

Coulse

Posterior interosseous artery is the smaller terminal
branch of the common interosseous, given off in the
cubital fossa. It enters the back of the forearm and lies
in between the muscles there.
It terminates by anastomosing with the anterior
interosseous artery.

FOREARM AND HAND

Relotions

1 It is the smaller terminal branch of the common

interosseous artery in the cubital fossa.

2 It enters the back of the forearm by passing between

the oblique cord and the upper margin of the

interosseous membrane (Fig. 9.60).

3 It appears on the back of the forearm in the interval

between the supinator and the abductor pollicis

longus and thereafter accompanies the posterior

interosseous nerve. At the lower border of the

extensor indicis, the artery becomes markedly

reduced and ends by anastomosing with the anterior

interosseous artery which reaches the posterior

compartment by piercing the interosseous

membrane at the upper border of the pronator

quadratus. Thus in its lower one-fourth, the back of

the forearm is supplied by the anterior interosseous

artery.

4 The posterior interosseous artery gives off an

interosseous recurrent branch which runs upwards

and takes part in the anastomosis on the back of the

lateral epicondyle of the humerus (see Fig. 8.10).

Mnemonics

Deep branch

To supinator

Anterior forearm muscles: Superficial group

'/Pretti Found Pamela for Fight"

Pronator teres

Flexor carpi radialis

Palmaris longus

Flexor carpi ulnaris

Flexor digitorum superficialis

lnterossei muscles: Actions of dorsal vs. palmar

in hand "PAd and DAb'

The Palmar Adduct and the Dorsal Abduct.

• Use your hand to dab with a pad.
  Median nerve: Hand muscles innervated "The
  LOAF muscles"
  Lumbricals 1 and 2
  Opponens pollicis
  Abductor pollicis brevis
  Flexor pollicis brevis

Median nerve exits the cubital fossa by passing

between two heads of pronator teres while ulnar

artery passes deep to both the heads of pronator

teres.

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