Muscles Origin, Insertion, Innervation, Action: EXTENSOR FOREARM AND HAND

Question 1

Origin and Insertion of Extensor Carpi Radialis Longus

Answer 1

Origin: Lower third of lateral supracondylar ridge of humerus
Insertion: Dorsal surface of the base of the second metacarpal bone

Question 2

Innervation and Action of Extensor Carpi Radialis Longus

Answer 2

Innervation: Radial nerve
Action: Extension and abduction of wrist

Question 3

Origin and Insertion of Extensor Capri Radialis Brevis

Answer 3

Origin: Lateral epicondyle of humerus
Insertion: Dorsal base of third metacarpal bone

Question 4

Innervation and Action of Extensor Carpi Radialis Brevis

Answer 4

Innervation: Radial nerve
Action: Extension and Abduction of wrist

Question 5

Origin and Insertion of Extensor Digitorum

Answer 5

Origin: Lateral epicondyle of humerus
Insertion: Dorsal digital expansions of digits 2-4

Question 6

Innervation and Action of Extensor Digitorum

Answer 6

Innervation: Deep radial nerve
Action: Extension of wrist

Question 7

Origin and Insertion of Extensor Digiti Minimi

Answer 7

Origin: Lateral epicondyle of humerus
Insertion: Dorsal digital expansion of the 1st phalanx of little finger

Question 8

Innervation and Action of Extensor Digiti Minimi

Answer 8

Innervation: Deep radial nerve
Action: Extension and abduction of wrist

Question 9

Origin and Insertion of Extensor Carpi Ulnaris

Answer 9

Origin: Lateral epicondyle of humerus
Insertion: Tubercle on the ulnar side of the base of 5th metacarpal

Question 10

Innervation and Action of Extensor Carpi Ulnaris

Answer 10

Innervation: Radial nerve
Action: Extends forearm at the elbow

Question 11

Origin and Insertion of Anconeus

Answer 11

Origin: Back part of lateral epicondyle of humerus
Insertion: Side of olecranon and proximal dorsal surface of body of ulna

Question 12

Innervation and Action of Anconeus

Answer 12

Innervation: Radial nerve
Action: Extends forearm at the elbow

Question 13

Origin and Insertion of Abductor Pollicis Longus

Answer 13

Origin: Lateral dorsal surface or radius and ulna
Insertion: Radial side of base of first metacarpal bone

Question 14

Innervation and Action of Abductor Pollicis Longus

Answer 14

Innervation: Deep radial nerve
Action: Abduction at wrist and thumb

Question 15

Origin and Insertion of Extensor Pollicis Brevis

Answer 15

Origin: Dorsal surface of radius and ulna
Insertion: Base of first phalanx of thumb

Question 16

Innervation and Action of Extensor Pollicis Brevis

Answer 16

Innervation: Deep radial nerve
Action: Extension of thumb, abduction of wrist

Question 17

Origin and Insertion of Extensor Pollicis Longus

Answer 17

Origin: Lateral part of middle third of dorsal surface of body of ulna
Insertion: Base of last phalanx of thumb

Question 18

Innervation and Action of Extensor Pollicis Longus

Answer 18

Innervation: Deep radial nerve
Action: Extension of thumb, abduction of wrist

Question 19

Origin and Insertion of Extensor Indicis

Answer 19

Origin: Posterior surface of ulna and interosseous membrane
Insertion: Posterior digital expansion of second digit

Question 20

Innervation and Action of Extensor Indicis

Answer 20

Innervation: Deep radial nerve
Action: Extension of wrist and joints of second digit

Question 21

Origin and Insertion of Supinator

Answer 21

Origin: Lateral epicondyle of humerus, ulna, radial collateral ligaments, and annular ligaments
Insertion: Dorsal and lateral surfaces of body of radius