Cranial and Lateral Forearm

Question 1

Extensor carpi radialis m.

origin-
insertion-
action-
innervation-

Answer 1

Origin: the lateral supracondylar crest

Insertion: Tuberosities on dorsal surfaces of metacarpals 2 & 3

Action: to extend the carpal joints

Innervation: radial nerve

Question 2

Common digital extensor m.
origin-
insertion-
action-
innervation-

Answer 2

the 4 tendons of this muscles goes to the distal phalanx of the four main digits

Origin- the lateral epicondyle of the humerus

*Insertion- the extensor processes of the distal phalanges of digits 2-5

Action- Extend carpal joints of carpus & digits 2-5

Innervation: Radial nerve

Question 3

Lateral digital extenseor m.
origin-
insertion-
action-
innervation-

Answer 3

Origin- the lateral epicondyle of the humerus

• *Insertion:
• Proximal ends of all phalanges of digits 3-5
• Extensor processes of distal phalanges of these digits

Action - to extend the carpal joints and digits 3-5
Innervation- Radial Nerve

Question 4

Ulnaris lateralis m.
action-
innervation-

Answer 4

only flexor that lies on the lateral epicondyle that is labeled an extensor

Action - to abduct the manus and flex the carpal joints

Innervation - radial nerve

Question 5

Supinator m..
action-
innervation-

Answer 5

action: -Rotate forearm laterally (supination)
- Flex elbow joint

innervation - radial nerve

Question 6

Abductor digiti 1 longus m.
action-
innervation-

Answer 6

lies between radius and ulna and crosses to metacarpal 1

action - to abduct the first digit or pollex and extend the carpal joints

Innervation: radial nerve