Gross Anatomy: Extensor Region Of The Forearm

Front 1

Describe extensor compartment of the forearm

Back 1

Posterior compartment of the forearm. Contains extensor muscles of hand and digits; innervated by the radial nerve. Nerves and vessels run in the connective tissue plane that divides the superficial and the deeps layers of the extensor muscles.

Front 2

List superficial layer muscles of the extensor compartment of the forearm

Back 2

Superficial layer muscles extend the wrist and proximal phalanges. M: 1. brachioradialis, 2. extensor carpi radialis longus, 3. extensor carpi radialis brevis, 4. extensor digitorum, 5. extensor carpi ulnaris. M 2-5 (all but brachioradialis and extensor carpi radialis longus) attach to the lateral epicondyle of the humerus by common extensor tendon

Front 3

Brachioradialis site of attachment /function

Back 3

Lateral surface of distal radius and lateral supracondylar ridge of the humerus. Flexes the forearm at the elbow; capable of both pronation and supination; innervated by the radial nerve

Front 4

Extensor carpi radialis longus site of attachment/function

Back 4

Lateral epicondyle of the humerus by common extensor tendon and base of metacarpal 2. Extends the wrist and abducts the hand at the wrist.

Front 5

Extensor carpi radialis brevis site of attachment/function

Back 5

Lateral epicondyle of the humeris by common extensor tendor and base of metacarpal 3. Extend and abduct the wrist.

Front 6

Extensor digitorum site of attachment/function

Back 6

Lateral epicondyle of the humerus by common extensor tendon and extensor extension of digits 2-5; extends the medial four digits of the hand

Front 7

Extensor carpi ulnaris site of attachment/function

Back 7

Lateral epicondyle of the humerus by common extensor tendon; extend and adduct wrist/hand

Front 8

How are tendons of extensor digitorum held together?

Back 8

By intertendious connection on the posterior surface of the hand

Front 9

What is expansor extention?

Back 9

Special connective attachments by which the extensor tendons insert into the phalanges

Front 10

Name muscles of the deep layer of forearm extensor

Back 10

1. Supinator, 2. adbuctor pollicis longus, 3. extensor pollicis brevis, 4. extensor pollicis longus, 5. extensor indicis;
Proximal attachment of 2-5 are posterior surfaces of radius, ulna, and interosseous membrane. 3 of the muscles emerge between extensor digitorum and extensor carpi radialis brevis (outcropping)