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

Muscles of the Pectoral (Thoracic Limb) Flashcards

(45 cards)

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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?

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A

Cranial sternum, costal cartilage

20
Q

What is the insertion of the m. subclavius?

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A

Epimysium of m. supraspinatus

21
Q

What is the function of the m. subclavius?

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A

Supports trunk, stabilizes shoulder

22
Q

What is the origin of the m. deltoidus?

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A

Scapular spine

23
Q

What is the insertion of the m. deltoidus?

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A

Deltoid tuberosity (of the humerus)

24
Q

What is the function of the m. deltoidus?

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A

Shoulder flexion

25
What is the origin of the m. supraspinatus?
Supraspinous fossa of the scapula
26
What is the insertion of the m. supraspinatus?
Greater tubercle of the humerus
27
What is the function of the m. supraspinatus?
Extension and stabilization of the shoulder
28
What is the origin of the m. infraspinatus?
Infraspinous fossa of the scapula
29
What is the insertion of the m. infraspinatus?
Greater tubercle of the humerus
30
What is the function of the m. infraspinatus?
Flexion and stabilization of the shoulder
31
What is the origin of the m. subscapularis?
Subscapular fossa
32
What is the insertion of the m. subscapularis?
Medial humerus
33
What is the function of the m. subscapularis?
Shoulder stabilization; adduction of the humerus
34
What is the origin of the m. biceps brachii?
Supraglenoid tubercle of the scapula
35
What is the insertion of the m. biceps brachii?
Cranial aspect of proximal radius and ulna
36
What is the function of the m. biceps brachii?
Elbow flexion and shoulder extension
37
What is the origin of the m. triceps brachii?
Caudal border of the scapula, proximal humerus
38
What is the insertion of the m. triceps brachii?
Olecranon process of the ulna
39
What is the function of the m. triceps brachii?
Elbow extension, shoulder flexion
40
What is the origin of the m. brachialis?
Caudal aspect of proximal humerus
41
What is the insertion of the m. brachialis?
Medial aspect of proximal radius
42
What is the function of the m. brachialis?
Elbow function
43
What is the origin of m. serratus ventralis?
Transverse processes of caudal cervical and cranial thoracic vertebrae
44
What is the insertion of the m. serratus ventralis?
Medial side of scapula and scapular cartilage
45
What is the function of the m. serratus ventralis?
Support trunk, lifts neck, advances and retracts scapula; provides connectivity between the ribs and scapula

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