extrinsic muscles of the thoracic limb Flashcards

1
Q

where are all the extrinsic muscles of the thoracic limb located

A

lateral scapula and shoulder

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2
Q

name all extrinsic muscles of the thoracic limb

A

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

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3
Q

origin of the superficial pectoral

A

first two sternebrae

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4
Q

insertion of the superficial pectoral

A

entire crest of greater tubercle

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5
Q

innervation of the superficial pectoral

A

cranial pectoral nerves (C7, C8)

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6
Q

function of the superficial pectoral

A

adducts the forelimb

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7
Q

origin of the deep pectoral muscle

A

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

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8
Q

insertion of the deep pectoral muscle

A

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

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9
Q

innervation of the deep pectoral muscle

A

caudal pectoral nerves (C8,C1)

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10
Q

function of the deep pectoral muscle

A

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

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11
Q

origin of the brachiocephalicus

A

faint line of clavicular insertion (fibrous vetigial clavicle)

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12
Q

insertion of the brachiocephalicus

A

distal end of the cranial border of the humerus

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13
Q

innervation of the brachiocephalicus

A

accessory nerve and ventral branches of cervical spinal nerves

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14
Q

function of the brachiocephalicus

A

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

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15
Q

origin of the cleidocephalicus

A

mid dorsal fibrous cervical raphe

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16
Q

insertion of the cleidocephalicus

A

faint line of clavicular insertion (fibrous vetigial clavicle)

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17
Q

innervation of the cleidocephalicus

A

accessory nerve and ventral branches of cervical spinal nerves.

18
Q

function of cleidocephalicus

A

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

19
Q

origin of the cleidomastoideus

A

mastoid part of the temporal bone with stemomastoideus muscle

20
Q

insertion of the cleidomastoideus

A

faint line of clavicular insertion (fibrous vetigial clavicle)

21
Q

innervation of the cleidomastoideus

A

accessory nerve and ventral branches of cervical spinal nerves.

22
Q

function of the cleidomastoideus

A

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

23
Q

origin of the omotransversarius

A

transverse wing of the attas

24
Q

insertion of the omotransversarius

A

distal end of the spine

25
innervation of the omontranserversarius
accessory
26
function of the omontransversarius
protracts the limb also flexes the head laterally
27
origin of the trapezius
median raphe of the neck C3-T9
28
insertion of the trapezius
the spine of the scapula
29
innervation of the trapezius
accessory nerve
30
function of the trapezius
abducts and elevates the forelimb
31
origin of the rhomboideus
median raphe of the neck; spinous processes of the first 7 thoracic vertebrae
32
insertion of the rhomboideus
dorsal border of the scapula
33
innervation of the rhomboideus
ventral branches of the cervical and thoracic spinal nerves
34
function of the rhomboideus
elevates the forelimb and draw scapula against the trunk
35
origin of the latissimus dorsi
thoracolumbar tascla; spinous processes of the lumbar and T7/8
36
insertion of the latissimus dorsi
teres major tuberosity of the humerus
37
innervation of the lattisimus dorsi
thoracodorsal nerve (C7, C8, T1)
38
function of the latissimus dorsi
retraction of the forelimb, flex the shoulder joint
39
origin of the serratus ventralis
transverse processes of the last five cervical vertebrae (C3-C7) and first of the or eight ribs midventrally.
40
insertion of serratus ventralis
serrated face of the scapula (dorsomedial third of the scapula)
41
innervation of the serratus ventralis
ventral branches of cervical spinal nerves and long thoracic nerves
42
function of the serratus ventralis
cranial and caudal part retractor of the forelimb also supports the trunk and depresses the scapula