Lecture 4 - Pectoral girdle Flashcards

1
Q

What part of the skeleton make up the pectoral girdle?

A

Coracoid, scapula, and clavicle

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2
Q

What part of the skeleton makes up the brachium?

A

Humerus

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3
Q

What part of the skeleton makes up the ante brachium?

A

Radius and ulna

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4
Q

What part of the skeleton makes up the carpus?

A

carpal bones

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5
Q

What part of the skeleton makes up the metacarpus?

A

metacarpal bones

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6
Q

What part of the skeleton makes up the digits?

A

Proximal, middle, and distal phalanges

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7
Q

Cingulum

A

shoulder

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8
Q

Stylopodium

A

brachium

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9
Q

Zeugopodium

A

antebrachium

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10
Q

Autopodium

A

manus

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11
Q

Basipodium

A

carpus

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12
Q

Metapodium

A

metacarpus

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13
Q

Acropodium

A

digit

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14
Q

What animals have complete pectoral girdles?

A

reptiles, birds, and monotremes

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15
Q

What is the structure of the pectoral girdle in MOST animals?

A

coracoid is reduced to a coracoid process

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16
Q

What is the clavicle like in cursorial quadrupedal mammals?

A

reduced or absent , no bony attachment of limb to pelvis

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17
Q

What is different about the scapula in a horse?

A

Dorsal aspect is extended by cartilage
Spine does not terminate at acromion process
Tuber spinae

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18
Q

What is the tuber spinae?

A

Thickened middle portion of the spine

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19
Q

What goes through the supracondylar foramen?

A

Brachial artery and medial nerve

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20
Q

What is different about the humerus of the horse?

A

Greater tubercle - cranial and caudal portion

Intermediate tubercle

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21
Q

Why is the shoulder joint in domestic animals restricted?

A

Due to the extensive muscling around the joint

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22
Q

In what way is the shoulder joint in domestic animals restricted?

A

sagittal excursions

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23
Q

What bony parts are in the glena-humeral joint?

A

head of humerus, gleaned of scapular

24
Q

What cartilage structure helps support the gleno-hemeral joint?

A

labrum

25
Q

Why does the shoulder joint have to be supported by muscles and tendons?

A

lacks collaeral ligaments

26
Q

What can the synovial fuss be confused with?

A

lesions on the cartilage

27
Q

What is the brachial plexus formed by?

A

ventral rami of C6-T2 (variations of C5-T1)

28
Q

What are the nerves of the BP that go to the extrinsic limb muscles?

A

Cranial pectoral, long thoracic, thoracodorsal, lateral thoracic, and caudal pectoral

29
Q

What nerve contributes to the long thoracic?

A

C7

30
Q

What muscle does the long thoracic n. innervate?

A

Serratus ventralis

31
Q

What nerve contributes to the thoracodorsal n.?

A

C8

32
Q

What muscle does the throacodorsal n.?

A

Latissimus dorsi

33
Q

What nerve contributes to the lateral thoracic n.?

A

T1

34
Q

What muscle does the lateral thoracic n. innervate?

A

Cutaneous trunci

35
Q

What nerve contributes to cranial/caudal pectoral n.?

A

T1

36
Q

What muscle does cranial/caudal pectoral n. innervate?

A

Pectoral mm.

37
Q

What arteries come off the brachiocephalic trunk in the dog?

A

right subclavian a.

common carotid aa. (off short bicarotid trunk)

38
Q

What branches off the aorta in dogs?

A

Brachiocephalic trunk and left subclavian a.

39
Q

What arteries supply the shoulder?

A

Superficial cervial a., suprascapular a., and subscapular a.

40
Q

What do the muscles of the pectoral girdle do?

A

1) suspend the thorax
2) stabilize the shoulder
3) move the limb

41
Q

In what directions does the scapula move?

A

cranial-caudal
dorsal-ventral
rotatory manner

42
Q

What movement advances the limb?

A

rotation that moves glenoid cranially

43
Q

What movement retracts the limb?

A

rotation that moves glenoid more ventrally

44
Q

What are the parts of the rhomboideus?

A

thoracis, cervicis, and capitis

45
Q

What are the parts of the serrates ventralis?

A

thoracis and cervicis

46
Q

What muscle do horses have that dogs don’t?

A

Subclavius

47
Q

What are the extrinsic shoulder muscles?

A

Omotransversarius, trapezius, brachiocephalicus, rhomboideus, latissimus dorsi, pectoralis profundus, subclavius (horse)
Serratus ventralis

48
Q

What are the muscles of the thorax?

A

Superficial pectoral m., Deep pectoral m.,

49
Q

What makes up the synarcosis in the shoulder?

A

pectoralis profundus and pelvic girdle muscles

50
Q

What is a synarcosis?

A

union of parts of the skeleton via muscles

51
Q

Whats makes the muscular supportive sling present in horses and cattle?

A

Serratus ventralis and pectoralis profundus

52
Q

What does this muscular sling do?

A

Transmit weight of head, neck and cranial part of trunk to forelimbs
Prevent thorax from collapsing

53
Q

What does the pectoral girdle do in regards to the scapula?

A

Stabilize it against external forces

54
Q

What is an external force that harms the scapula?

A

force of landing after jumping or pouncing can cause displacement or rotation of the scapula

55
Q

What is a rupture of the serratus ventralis?

A

severe trama to neck and withers where serratus ventralis attaches

56
Q

What is the progonosis of a serratus ventralis rupture?

A

Rarely see a full recovery

Surgery or euthanize