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Domestic Animal Biology > Muscles of the Pectoral (Thoracic Limb) > Flashcards

Muscles of the Pectoral (Thoracic Limb) Flashcards

1
Q

What is the origin of the m. trapezius?

A

Ligaments of the dorsal midline (nuchal ligaments)

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2
Q

What is the insertion of the m. trapezius?

A

Scapular spine

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3
Q

What is the function of the m. trapezius?

A

Helps to lift and advance the scapula, lifts the neck

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4
Q

What is the origin of the m. rhomboideus?

A

Ligaments of the dorsal midline (nuchal ligament); deep to m. trapezius

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5
Q

What is the insertion of the m. rhomboideus?

A

Medial side of the scapula

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6
Q

What is the function of the m. rhomboideus?

A

Lifts, advances, and retracts the scapula

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7
Q

What is the origin of the m. brachiocephalicus?

A

Occipital bone, transverse processes of the cervical vertebrae

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8
Q

What is the insertion of the m. brachiocephalicus?

A

Lateral humerus, deltoid tuberosity, fascia of arm and forearm

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9
Q

What is the function of the m. brachiocephalicus?

A

Lateral neck flexion, shoulder extension, advances limb

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10
Q

What is the origin of the m. latissimus dorsi?

A

Spinous processes of thoracic and lumbar vertebrae

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11
Q

What is the insertion of the m. latissimus dorsi?

A

Medial humerus

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12
Q

What is the function of the m. latissimus dorsi?

A

Limb retraction, shoulder flexion

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13
Q

What is the origin of the m. pectoralis superficialis?

A

Sternum and cranial costal cartilage

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14
Q

What is the insertion of the m. pectoralis superficialis?

A

Medial humerus, fascia of arm/forearm

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15
Q

What is the function of the m. pectoralis superficialis?

A

Adduction of the forelimb

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16
Q

What is the origin of the m. pectoralis profundus?

A

Sternum, ribs, abdominal fascia

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17
Q

What is the insertion of the m. pectoralis profundus?

A

Craniomedial humerus

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18
Q

What is the function of the m. pectoralis profundus?

A

Adduction and retract of limb; advances trunk when limb is weight-bearing

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19
Q

What is the origin of the m. subclavius?

A

Cranial sternum, costal cartilage

20
Q

What is the insertion of the m. subclavius?

A

Epimysium of m. supraspinatus

21
Q

What is the function of the m. subclavius?

A

Supports trunk, stabilizes shoulder

22
Q

What is the origin of the m. deltoidus?

A

Scapular spine

23
Q

What is the insertion of the m. deltoidus?

A

Deltoid tuberosity (of the humerus)

24
Q

What is the function of the m. deltoidus?

A

Shoulder flexion

25
Q

What is the origin of the m. supraspinatus?

A

Supraspinous fossa of the scapula

26
Q

What is the insertion of the m. supraspinatus?

A

Greater tubercle of the humerus

27
Q

What is the function of the m. supraspinatus?

A

Extension and stabilization of the shoulder

28
Q

What is the origin of the m. infraspinatus?

A

Infraspinous fossa of the scapula

29
Q

What is the insertion of the m. infraspinatus?

A

Greater tubercle of the humerus

30
Q

What is the function of the m. infraspinatus?

A

Flexion and stabilization of the shoulder

31
Q

What is the origin of the m. subscapularis?

A

Subscapular fossa

32
Q

What is the insertion of the m. subscapularis?

A

Medial humerus

33
Q

What is the function of the m. subscapularis?

A

Shoulder stabilization; adduction of the humerus

34
Q

What is the origin of the m. biceps brachii?

A

Supraglenoid tubercle of the scapula

35
Q

What is the insertion of the m. biceps brachii?

A

Cranial aspect of proximal radius and ulna

36
Q

What is the function of the m. biceps brachii?

A

Elbow flexion and shoulder extension

37
Q

What is the origin of the m. triceps brachii?

A

Caudal border of the scapula, proximal humerus

38
Q

What is the insertion of the m. triceps brachii?

A

Olecranon process of the ulna

39
Q

What is the function of the m. triceps brachii?

A

Elbow extension, shoulder flexion

40
Q

What is the origin of the m. brachialis?

A

Caudal aspect of proximal humerus

41
Q

What is the insertion of the m. brachialis?

A

Medial aspect of proximal radius

42
Q

What is the function of the m. brachialis?

A

Elbow function

43
Q

What is the origin of m. serratus ventralis?

A

Transverse processes of caudal cervical and cranial thoracic vertebrae

44
Q

What is the insertion of the m. serratus ventralis?

A

Medial side of scapula and scapular cartilage

45
Q

What is the function of the m. serratus ventralis?

A

Support trunk, lifts neck, advances and retracts scapula; provides connectivity between the ribs and scapula

Domestic Animal Biology (7 decks)

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