Extrinsic Muscles of the Thoracic Limb

Question 1

Descending Superficial Pectoral Muscle ORIGIN

Answer 1

1st sternebra

Question 2

descending superficial pectoral muscle INSERTION

Answer 2

crest of the greater tubercle of the humerus

Question 3

transverse superficial pectoral muscle ORIGIN

Answer 3

first 2 or 3 sternebra

Question 4

transverse superficial pectoral muscle INSERTION

Answer 4

crest of the greater tubercle of the humerus

Question 5

superficial pectorals ACTION

Answer 5

adduct the limb when not weight bearing; prevent abduction of the limb when weight bearing

Question 6

deep pectoral muscle ORIGIN

Answer 6

ventral part of the sternum; fibrous raphe of muscles (deep abdominal fascia at caudal end of sternum)

Question 7

deep pectoral INSERTION

Answer 7

muscle and tendon mainly at lesser tubercle of the humerus’ aponeurosis to greater tubercle and crest; caudal part: medial brachial fascia

Question 8

deep pectoral ACTION

Answer 8

pull trunk cranially, when not bearing weight, draw limb caudally and flex shoulder joint – abduct limb

Question 9

braciocephalicus PARTS

Answer 9

cleidobrachialis (caudal) , cleidocephalicis (cranial) (cleidomastoideus, cleidocervialis), clavicular intersection (middle)

Question 10

cleidobrachialis ORIGIN

Answer 10

(movable) clavicular intersection

Question 11

cleidobrachialis INSERTION

Answer 11

distal end of the caudal border of the humerus

Question 12

cleidocervicalis ORIGIN

Answer 12

clavicular intersection

Question 13

cleidocervicalis INSERTION

Answer 13

cranial half of mid dorsal raphe, nuchal crest of occipital bone

Question 14

cleidomastoideus ORIGIN

Answer 14

clavicular intersection

Question 15

cleidomastoideus INSERTION

Answer 15

mastoid process on the temporal bone of the skull

Question 16

brachiocephalicus ACTION

Answer 16

advance limb, extend shoulder joint, draw head and neck to the side

Question 17

sternocephalicus PARTS

Answer 17

occipital and mastoid (at cranial end)

Question 18

sternocephalicus ORIGIN

Answer 18

1st sternebra or manubrium

Question 19

occipital sternocephalicus INSERTION

Answer 19

nuchal crest of the occipital bone

Question 20

mastoid sternocephalicus INSERTION

Answer 20

mastoid process of the temporal bone of the skull

Question 21

sternocephalicus ACTION

Answer 21

draw head and neck to the side

Question 22

omotransversarius ORIGIN/ATTACHMENT (caudal end)

Answer 22

distal end of the spine of the scapula

Question 23

omotransversarius INSERTION/ATTACHMENT (cranial end)

Answer 23

transverse process of the atlas (vertebrae c1)

Question 24

omotransversarius ACTION

Answer 24

advance limb or flex neck

Question 25

two muscles that create jugular groove

Answer 25

sternocephalicus and brachiocephalicus

Question 26

trapezius ORIGIN

Answer 26

median raphe of the neck and supraspinous ligament (c3-t9)

Question 27

trapezius INSERTION

Answer 27

spine of the scapula

Question 28

trapezius ACTION

Answer 28

elevate and abduct the forelimb

Question 29

latissmus dorsi ORIGIN

Answer 29

thoraculumbar fascia from spinous processes of lumbar to last 7 or 8 thoracic vertebrae' muscular attachment to last 2 or 3 ribs

Question 30

latissmus dorsi INSERTION

Answer 30

teres major tuberosity of humerus and teres major tendon

Question 31

latissmus dorsi ACTION

Answer 31

draw free limb caudally as in digging and flex shoulder joint

Question 32

rhomboideus PARTS

Answer 32

cervical, thoracic, capital

Question 33

rhomboideus capitalis ORIGIN

Answer 33

nuchal crest of occipital bone

Question 34

rhomboidues cervicis ORIGIN

Answer 34

median fibrous raphe of the neck

Question 35

rhomboideus thoracis ORIGIN

Answer 35

spinous processes of the 1st 7 thoracic vertebrae

Question 36

rhomboideus INSERTION

Answer 36

dorsal border of the scapula

Question 37

rhomboideus ACTION

Answer 37

elevate forelimb and draw scapula against the trunk

Question 38

serratus ventralis PARTS

Answer 38

cervicis and thoracis

Question 39

serratus ventralis ORIGIN

Answer 39

transverse processes of last 5 cervical vertebrae and first 7 or 8 ribs ventral to their middle

Question 40

serratus ventralis INSERTION

Answer 40

dorsomedial third of scapula (serrated face)

Question 41

serratus ventralis ACTION

Answer 41

support trunk and depress scapula