Actions of Muscles (Thoracic Limb)

Question 1

Superficial Pectoral

Answer 1

adduct limb (non-weight bearing) & prevent abduction (weight-bearing)

Question 2

Deep Pectoral

Answer 2

Supporting weight: pull trunk cranial, extend shoulder
Not supporting weight: draw limb in caudal, flex shoulder, adduct limb

Question 3

Brachiocephalicus

Answer 3

extend shoulder & draw head/neck lateral

Question 4

Sternocephalicus

Answer 4

draw head/neck lateral

Question 5

Sternohyoideus

Answer 5

pull tongue/larynx caudal

Question 6

Sternothyroideus

Answer 6

Pull tongue/larynx caudal

Question 7

Omotransversarius

Answer 7

Advance limb or flex neck lateral

Question 8

Trapezius

Answer 8

elevate & abduct forelimb

Question 9

Rhomboideus

Answer 9

elevate forelimb & draw scapula against trunk

Question 10

Latissimus Dorsi

Answer 10

draw free limb caudal
flex shoulder

Question 11

Serratus Ventralis (Cervicis & Thoracis)

Answer 11

support trunk & depress scapula

Question 12

Deltoideus

Answer 12

flex shoulder

Question 13

Infraspinatus

Answer 13

extend or flex shoulder

Question 14

Supraspinatus

Answer 14

extend & stabilize shoulder

Question 15

Teres Minor

Answer 15

flex shoulder & rotate lateral
prevent medial rotation when weight bearing

Question 16

Teres Major

Answer 16

Flex shoulder & rotate medial
Prevent lateral rotation when weight bearing

Question 17

Coracobrachialis

Answer 17

adduct, extend, stabilize shoulder

Question 18

Subscapularis

Answer 18

adduct, extend, medial stabilize shoulder
prevent lateral rotation when weight bearing

Question 19

Triceps Brachii: Long head

Answer 19

extend elbow, flex shoulder

Question 20

Triceps Brachii: Lateral/Accessory/Medial head

Answer 20

Extend elbow

Question 21

Anconeus

Answer 21

extend elbow

Question 22

Biceps Brachii

Answer 22

flex elbow, extend shoulder

Question 23

Brachialis

Answer 23

flex elbow

Question 24

Brachioradialis

Answer 24

supination of antebrachium

Question 25

Extensor Carpi Radialis

Answer 25

extend carpus

Question 26

Common Digital Extensor

Answer 26

extend joints of 4 main digits & carpus

Question 27

Lateral Digital Extensor

Answer 27

extend carpus & joints III,IV,V

Question 28

Extensor Carpi Ulnaris

Answer 28

abduct carpal joint, support extended carpus

Question 29

Supinator

Answer 29

rotate forearm lateral (supine) to flex elbow

Question 30

Abductor Pollicis Longus

Answer 30

abduct first digit & extend carpal joints

Question 31

Pronator Teres

Answer 31

rotate forearm medial (prone), flex elbow

Question 32

Flexor Carpi Radialis

Answer 32

flex carpus

Question 33

Superficial Digital Flexor

Answer 33

flex carpal, metacarpophalangeal, proximal interphalangeal joints of digits II-V

Question 34

Superficial Digital Flexor

Answer 34

flex carpal, metacarpophalangeal, proximal interphalangeal joints of digits II-V

Question 35

Superficial Digital Flexor

Answer 35

flex carpal, metacarpophalangeal, proximal interphalangeal joints of digits II-V

Question 36

Flexor Carpi Ulnaris

Answer 36

flex carpus

Question 37

flex carpal & metacarpophyalangeal joints of digits

Question 38

Pronator Quadratus

Answer 38

pronate paw