extrinsic muscles of the thoracic limb

Question 1

where are all the extrinsic muscles of the thoracic limb located

Answer 1

lateral scapula and shoulder

Question 2

name all extrinsic muscles of the thoracic limb

Answer 2

superficial pectoral
deep pectoral
brachiocephalicus - cleidocephalicus and cleidomastoideus
omotransversarius
trapezius
rhomboideus
latissimus dorsi
serratus ventralis - cranial and caudal

Question 3

origin of the superficial pectoral

Answer 3

first two sternebrae

Question 4

insertion of the superficial pectoral

Answer 4

entire crest of greater tubercle

Question 5

innervation of the superficial pectoral

Answer 5

cranial pectoral nerves (C7, C8)

Question 6

function of the superficial pectoral

Answer 6

adducts the forelimb

Question 7

origin of the deep pectoral muscle

Answer 7

ventral part of the sternum - the caudal end of the sternum

Question 8

insertion of the deep pectoral muscle

Answer 8

crest of greater tubercle and partly on lesser tubercle of the humerus

Question 9

innervation of the deep pectoral muscle

Answer 9

caudal pectoral nerves (C8,C1)

Question 10

function of the deep pectoral muscle

Answer 10

adducts the forelimb, draw limb caudally, flexes the shoulder joint

Question 11

origin of the brachiocephalicus

Answer 11

faint line of clavicular insertion (fibrous vetigial clavicle)

Question 12

insertion of the brachiocephalicus

Answer 12

distal end of the cranial border of the humerus

Question 13

innervation of the brachiocephalicus

Answer 13

accessory nerve and ventral branches of cervical spinal nerves

Question 14

function of the brachiocephalicus

Answer 14

protract the limb
extend the shoulder
draw the head and neck to the side

Question 15

origin of the cleidocephalicus

Answer 15

mid dorsal fibrous cervical raphe

Question 16

insertion of the cleidocephalicus

Answer 16

faint line of clavicular insertion (fibrous vetigial clavicle)

Question 17

innervation of the cleidocephalicus

Answer 17

accessory nerve and ventral branches of cervical spinal nerves.

Question 18

function of cleidocephalicus

Answer 18

protract the limb
extend the shoulder
draw the head and neck to the side

Question 19

origin of the cleidomastoideus

Answer 19

mastoid part of the temporal bone with stemomastoideus muscle

Question 20

insertion of the cleidomastoideus

Answer 20

faint line of clavicular insertion (fibrous vetigial clavicle)

Question 21

innervation of the cleidomastoideus

Answer 21

accessory nerve and ventral branches of cervical spinal nerves.

Question 22

function of the cleidomastoideus

Answer 22

protract the limb
extend the shoulder
draw the head and neck to the side

Question 23

origin of the omotransversarius

Answer 23

transverse wing of the attas

Question 24

insertion of the omotransversarius

Answer 24

distal end of the spine

Question 25

innervation of the omontranserversarius

Answer 25

accessory

Question 26

function of the omontransversarius

Answer 26

protracts the limb also flexes the head laterally

Question 27

origin of the trapezius

Answer 27

median raphe of the neck C3-T9

Question 28

insertion of the trapezius

Answer 28

the spine of the scapula

Question 29

innervation of the trapezius

Answer 29

accessory nerve

Question 30

function of the trapezius

Answer 30

abducts and elevates the forelimb

Question 31

origin of the rhomboideus

Answer 31

median raphe of the neck; spinous processes of the first 7 thoracic vertebrae

Question 32

insertion of the rhomboideus

Answer 32

dorsal border of the scapula

Question 33

innervation of the rhomboideus

Answer 33

ventral branches of the cervical and thoracic spinal nerves

Question 34

function of the rhomboideus

Answer 34

elevates the forelimb and draw scapula against the trunk

Question 35

origin of the latissimus dorsi

Answer 35

thoracolumbar tascla; spinous processes of the lumbar and T7/8

Question 36

insertion of the latissimus dorsi

Answer 36

teres major tuberosity of the humerus

Question 37

innervation of the lattisimus dorsi

Answer 37

thoracodorsal nerve (C7, C8, T1)

Question 38

function of the latissimus dorsi

Answer 38

retraction of the forelimb, flex the shoulder joint

Question 39

origin of the serratus ventralis

Answer 39

transverse processes of the last five cervical vertebrae (C3-C7) and first of the or eight ribs midventrally.

Question 40

insertion of serratus ventralis

Answer 40

serrated face of the scapula
(dorsomedial third of the scapula)

Question 41

innervation of the serratus ventralis

Answer 41

ventral branches of cervical spinal nerves and long thoracic nerves

Question 42

function of the serratus ventralis

Answer 42

cranial and caudal part retractor of the forelimb
also supports the trunk and depresses the scapula