Intrinsic Muscles of the Canine Thoracic Limb-Distal

Question 1

Extensor Carpi Radialis

Answer 1

O: lateral supercondylar crest of the humerus
I: dorsal aspect of metecarpals II and III
A: extend carpus

Question 2

Common Digital Extensor

Answer 2

O: lateral epicondyle of the humerus
I: extensor process of distal phalanx of digits II, III, IV and V
A: extend the digits

Question 3

Lateral Digital Extensor

Answer 3

O: lateral epicondyle of the humerus
I: extensor process of the distal phalnax of digits III, IV, and V, proximal ends of all phalanges of same digits
A: extend digits III, IV, V

Question 4

Ulnaris Lateralis

Answer 4

O: lateral epicondyle of the humerus
I: lateral aspect of the proximal ends of metacarpal V, accessory carpal bone
A: abduct carpus, flex carpus

Question 5

Suprinator

Answer 5

O: lateral epicondyle of the humerus
I: cranial aspect of proximal radius
A: supination

Question 6

pronator teres

Answer 6

O: medial epicondyle of the humerus
I: medial border of the radius
A: pronation

Question 7

abductor pollicis longus (abductor digiti I longus)

Answer 7

O: Lateral and cranial border of the ulna, interosseus membrane between radius and ulna
I: proximal end of metacarpal I
A: abduct digit I

Question 8

flexor carpi radialis

Answer 8

O: medial epicondyle of the humerus, medial border of the radius
I: palmar surface of proximal metacarpals II and III
A: flex carpus

Question 9

superficial digital flexor

Answer 9

O: medial epicondyle of humerus
I: palmar surface of the base of the middle phalanges of digits II, III, IV, and V
A: flex digits II-V

Note: forms a sleeve so that the of the DDF can pass through called flexor manica; annular ligaments hold down tendons of SDF and DDF-palmar, proximal, and distal

Question 10

flexor carpi ulnaris

Answer 10

O: medial epicondyle of the humerus, caudal and medial aspect of the olecranon
I: accessory carpal bone
A: flex carpus

Question 11

deep digital flexor

Answer 11

O: medial epicondyle of humerus; ulna; radius
I: palmar surface of the base of the distal phalanx of each digit
A: flex digit

Note: has 3 heads: radial, humeral, and ulnar

Question 12

pronator quadratus

Answer 12

muscle located within the space between the radiu and ulna

A: pronate the antebrachium

Question 13

Interossei

Answer 13

4 interosseus muscles in dog, lie deep to the DDF tendons and cover surfaces main metacarpal bones.; there are two proximal sesamoid bones embedded in the tendon of insertion
in horse commonly called the suspensory ligament-lateral and medial extensor branches that unite with tendon of common digital extensor, 3 pairs of sesamoid ligaments: straight, obliques, and cruciate