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Anatomy 1 > Thoracic Limb Intrinsic Muscles > Flashcards

Thoracic Limb Intrinsic Muscles Flashcards

1
Q

The _____ of a muscle is the more fixed point of muscle attachment, whereas the _____ is the more moveable point of muscle attachment.

A
  • Origin

- Insertion

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2
Q

An _____ muscle of the thoracic limb is one that has both its origin and insertion on the bones of the thoracic limb

A

Intrinsic

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3
Q

_____ is an increase in the angle of a joint, and ____ is a decrease in the angle of a joint. The ____ surface is the side of a joint that will decrease in angle upon the contraction of a muscle.

A
  • Extension
  • Flexion
  • Flexor
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4
Q

What is the action of the deltoideus?

A

To flex the shoulder

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5
Q

What is the action of the infraspinatus?

A

Abducts the shoulder

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6
Q

What is the action of the teres minor?

A

Flexion of the shoulder joint

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7
Q

What is the action, origin, and insertion of the supraspinatus?

A
  • Action: Extension of the shoulder joint
  • Origin: the supraspinous fossa
  • Insertion: The greater tubercle of the humerus
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8
Q

What is the action of the subscapularis?

A

To adduct the shoulder joint

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9
Q

What is the action, origin, and insertion of the teres major?

A

Action: Flex the shoulder
Origin: Caudal angle/border of the scapula
Insertion: Teres major tuberosity of the humerus

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10
Q

What is the action of the coracobrachialis?

A

To adduct the shoulder joint

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11
Q

The _____ ______ _____ is a synovial fluid filled sac that will reduce friction of the muscle tendon as it glides over the humerus.

A

Subtendinous Synovial Bursa

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12
Q

What is the action of the tensor fasciae antebrachii?

A

To extend the elbow

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13
Q

What is the origin, insertion, and action of the triceps brachiii long head?

A

Origin: the caudal border of the scapula
Insertion: The olecranon tuber of the ulna
Action: Extend the elbow

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14
Q

What is the origin, insertion, and action of the lateral head of the triceps brachii?

A

-Origin: Tricipital line of the humerus
-Insertion: Olecranon tuber of the ulna
Action: To extend the elbow

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15
Q

What is the Action, origin, and insertion of the triceps brachii accessory head?

A

Action: To extend the elbow
Origin: The neck of the humerus
Insertion: The olecranon tuber of the ulna

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16
Q

What is the action, origin, and insertion of the medial head of the triceps brachii?

A

Action: To extend the elbow
Origin: The crest of the lesser tubercle of the humerus
Insertion: The olecrennon tuber of the ulna

17
Q

The _____ is the only muscle that must be transected for a surgical approach to the elbow joint?

A

Anconeus

18
Q

What is the action of the anconeus?

A

To extend the elbow

19
Q

What is the action, origin, and insertion of the biceps brachii?

A

Action: Flex the elbow
Origin: The supraglenoid tubercle of the scapula
Insertion: The ulnar and radial tuberosities

20
Q

The ______ _____ ____ holds the biceps brachii tendon of origin in place as it passes through the ____ ____.

A
  • Transverse humeral retinaculum

- intertubercular groove

21
Q

What is the action of the brachialis?

A

To flex the elbow

22
Q

What is the action, origin, and insertion of the extensor carpi radialis?

A

Action: to extend the carpus
Origin: the lateral supracondylar crest of the humerus
Insertion: Dorsal surface of the base of metacarpals II and III

23
Q

What is the action, origin, and insertion of the common digital extensor?

A

Action: to extend the carpus and digits
Origin: The lateral epicondyle of the humerus
Insertion: The extensor processes of the distal phalanges II-V

24
Q

What is the action of the lateral digital extensor?

A

To extend the carpus

25
Q

What is the action of the ulnaris lateralis?

A

To extend the carpal joint

26
Q

What is the action of the supinator?

A

Supination of the paw

27
Q

What is the action of the abductor pollicis longus?

A

To abduct digit I

28
Q

What is the action, origin, and insertion of the superficial digital flexor?

A
  • Action: to flex the carpus
  • Origin: The medial epicondyle of the humerus
  • Insertion: Palmar surface of the of the middle phalanges II-V.
29
Q

What Is the action of pronator teres?

A

Pronation of the paw

30
Q

What is the action of flexor carpi radialis?

A

To flex the carpus

31
Q

What is the action, origin, and insertion of flexor carpi ulnaris (humeral and ulnar heads)?

A

Action: to flex the carpus
Origin: Humeral- the medial epicondyle of the humerus Ulnar- caudomedial surface of the olecranon
Insertion: The accessory carpal bone

32
Q

What is the action, origin, and insertion of the deep digital flexor? (humeral, ulnar, and radial heads)

A

-Action: To flex the carpus
-Origin: Humeral- the medial epicondyle of the humerus Ulnar- the proximal aspect of the caudal border of the ulna Radial- The middle third of the medial boarder of the radius
Insertion: The palmar surface of the base of the distal phalanx of each digit

33
Q

The _____ ____ is a sleeve of the superficial digital flexor that allows the deep digital flexor to pass through it.

A

Manica flexoria

34
Q

What is the action of the pronator quadratus?

A

Pronation of the paw

35
Q

What is the action, origin, and insertion of the interosseous muscle?

A

Action: flexion of the metacarpophalangeal joints
Insertion: Proximal end of the first phalanx
Origin: Proximal ends of metacarpal bones II-V

Anatomy 1 (11 decks)

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