Actions of Muscles of the Thoracic Limb

Question 1

superficial pectoral muscles

Answer 1

adduct limb when non-weight bearing; prevent abduction when limb is weight bearing

Question 2

deep pectoral

Answer 2

pull limb cranially and extend shoulder; draw limb caudally and flex shoulder when non-weight bearing; adduct limb

Question 3

brachiocephalicus (all parts)

Answer 3

advance limb; extend shoulder; draw head and neck to side

Question 4

sternocephalicus

Answer 4

draw head and neck to side

Question 5

sternohyoideus

Answer 5

pull tongue and larynx caudally

Question 6

sternothyroideus

Answer 6

pull tongue and larynx caudally

Question 7

omotransversarius

Answer 7

advance limb or flex neck laterally

Question 8

trapezius (both parts)

Answer 8

elevate and abduct limb

Question 9

rhomboideus (all parts)

Answer 9

elevate limb, draw scapula against body

Question 10

latissimus dorsi

Answer 10

draw limb caudally; flex shoulder

Question 11

serratus ventralis cervicis and thoracis

Answer 11

support trunk, depress scapula

Question 12

deltoideus

Answer 12

flex and abduct shoulder

Question 13

infraspinatus

Answer 13

extend, flex shoulder; abduct and rotate shoulder laterally; stabilize joint

Question 14

teres minor

Answer 14

flex shoulder, rotate shoulder laterally

Question 15

supraspinatus

Answer 15

extend, stabilize shoulder

Question 16

subscapularis

Answer 16

adduct, extend, medially stabilize shoulder

Question 17

teres major

Answer 17

flex, rotate medially shoulder

Question 18

coracobrachialis

Answer 18

adduct, stabilize shoulder joint

Question 19

tensor fasciae antebrachii

Answer 19

extend elbow

Question 20

triceps brachii (all heads)

Answer 20

extend elbow

Question 21

triceps brachii long head

Answer 21

flex shoulder joint

Question 22

anconeus

Answer 22

extend elbow

Question 23

biceps brachii

Answer 23

flex elbow, extend shoulder

Question 24

brachialis

Answer 24

flex elbow

Question 25

extensor carpi radialis

Answer 25

extend carpus

Question 26

common digital extensor

Answer 26

extend joints of digits 2-5

Question 27

lateral digital extensor

Answer 27

extend joints of digits 3-5

Question 28

extensor carpi ulnaris

Answer 28

abduct carpal joints, support carpus when weight bearing

Question 29

supinator

Answer 29

supinate paw, flex elbow

Question 30

abductor digit I longus (abductor pollicis longus)

Answer 30

abduct digit 1, extend carpal joints

Question 31

pronator teres

Answer 31

pronation, flex elbow

Question 32

flexor carpi radialis

Answer 32

flex carpus

Question 33

superficial digital flexor

Answer 33

flex carpal, metacarpophalangeal, and proximal interphalangeal joints

Question 34

flexor carpi ulnaris

Answer 34

flex carpus

Question 35

deep digital flexor (all heads)

Answer 35

flex carpal, metacarpophalangeal, and prximal and distal interphalangeal joints

Question 36

pronator quadratus

Answer 36

pronate paw