Upper Extremity 4st Part

Question 1

Origin of the Extensor Pollicis Longus

Answer 1

Middle part of posterior ulnar body + Interosseous membrane

Question 2

Insertion of the Extensor Pollicis Longus

Answer 2

Base of distal phalanx of digit 1 (thumb)

Question 3

Function of the Extensor Pollicis Longus

Answer 3

Ext. of digit 1 at metacarpophalangeal and interphalangeal joints + hand ext. at wrist joint

Question 4

Origin of the Extensor Pollicis Brevis

Answer 4

Dorsal surface of body of the radius + interosseous membrane

Question 5

Insertion of the Extensor Pollicis Brevis

Answer 5

Base of distal phalanx of digit 1 (thumb)

Question 6

Function of the Extensor Pollicis Brevis

Answer 6

Ext. of digit 1 at metacarpophalangeal and interphalangeal joints + abduction of hand at wrist joint

Question 7

Origin of the Extensor Digitorum

Answer 7

Lateral epicondyle of humerus

Question 8

Insertion of the Extensor Digitorum

Answer 8

Dorsal digital expansions of digits 2-5

Question 9

Function of the Extensor Digitorum

Answer 9

Ext. of fingers at metacarpophalangeal joints 2-5 + Ext. of hand at wrist joint

Question 10

Origin of the Extensor Carpi Ulnaris

Answer 10

Lateral epicondyle of humerus + dorsal surface of ulna

Question 11

Insertion of the Extensor Carpi Ulnaris

Answer 11

Base of metacarpal 5

Question 12

Function of the Extensor Carpi Ulnaris

Answer 12

Ext. and adduction of hand at wrist joint

Question 13

Origin of the Extensor Carpi Radialis Longus

Answer 13

Lateral supracondylar ridge of humerus

Question 14

Insertion of the Extensor Carpi Radialis Longus

Answer 14

Dorsal surface of the base of metacarpal 2

Question 15

Function of the Extensor Carpi Radialis Longus

Answer 15

Ext. + abduction of hand at wrist joint

Question 16

Origin of the Extensor Carpi Radialis Brevis

Answer 16

Lateral epicondyle of humerus

Question 17

Insertion of the Extensor Carpi Radialis Brevis

Answer 17

Dorsal base of metacarpal 3

Question 18

Function of the Extensor Carpi Radialis Brevis

Answer 18

Ext. + abduction of hand at wrist joint

Question 18

Origin of the Extensor Indicis Proprius

Answer 18

Posterior surface of ulna + interosseous membrane

Question 19

Insertion of the Extensor Indicis Proprius

Answer 19

Posterior digital expansion of digit 2 (index)

Question 20

Function of the Extensor Indicis Proprius

Answer 20

Ext. of digit 2 at metacarpophalangeal and interphalangeal joints + ext. of hand at wrist joint

Question 21

Origin of the Extensor Digiti Minimi

Answer 21

Lateral epicondyle of humerus

Question 22

Insertion of the Extensor Digiti Minimi

Answer 22

Dorsal digital expansions of digit 5

Question 23

Function of the Extensor Digiti Minimi

Answer 23

Ext. of finger at metacarpophalangeal and interphalangeal joint 5 + ext. of hand at wrist joint

Question 24

Origin of the Brachioradialis

Answer 24

Ridge superior to the lateral epicondule of the humerus + lateral intermuscular septum

Question 25

Insertion of the Brachioradialis

Answer 25

Lateral side of the base of the styloid process of the radius

Question 26

Function of the Brachioradialis

Answer 26

Flex. of forearm at elbow joint

Question 27

Origin of the Dorsal Interossei

Answer 27

2 heads from the adjacents sides of metacarpals 1-5

Question 28

Insertion of the Dorsal Interossei

Answer 28

Base of proximal phalanges and dorsal expansions of digits 2-4

Question 29

Function of the Dorsal Interossei

Answer 29

Abduction + flex. of fingers at metacarpophalangeal joints 2-4 + ext. of fingers at interphalangeal joints 2-4