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Anatomy > Intrinsic Muscles of the Thoracic Limb > Flashcards

Intrinsic Muscles of the Thoracic Limb Flashcards

1
Q

deltoideus m.

A

O: spine and acromion of the scapula

I: deltoid tuberosity of the humerus

Action: flex the shoulder

horses only have one part since they do not have an acromion*

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2
Q

infraspinatus m.

A

O: infraspinous fossa of the scapula

I: lateral side of the greater tubercle of the humerus

Action: extend the shoulder; stabilize the shoulder laterally (prevent medial rotation); abduct and laterally rotate the shoulder

*subtendinous synovial bursa

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3
Q

supraspinatus m.

A

O: supraspinous fossa of the scapula

I: greater tubercle of the humerus

Action: stabilize shoulder laterally (prevent medial rotation); shoulder extensor

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4
Q

teres minor m.

A

O: infragelnoid tubercle of the scapula; distal caudal border of the scapula

I: teres minor tuberosity of the humerus

Action: flex the shoulder; stabilize and rotate shoulder laterally

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5
Q

subscapularis m.

A

O: subscapular fossa of the scapula

I: lesser tubercle of the humerus

Action: stabilize medially; extend shoulder; adduct shoulder

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6
Q

teres major m.

A

O: caudal border and angle of the scapula; subscapularis muscle

I: teres major tuberosity

Action: rotate shoulder medially; extend shoulder

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7
Q

What muscles act as shoulder extensors?

A
  1. infraspinatus m.
  2. supraspinatus m.
  3. subscapularis m.
  4. coracobrachialis m.
  5. biceps brachii m.
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8
Q

What muscles act as shoulder flexors?

A
  1. teres minor m.
  2. teres major m.
  3. deltoideus m.
  4. long head of triceps brachii m.
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9
Q

coracobrachialis

A

O: coracoid process of scapula

I: crest of lesser tubercle; near teres major tuberosity

Action: shoulder stabilizer

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10
Q

tensor fasciae antebrachii

A

O: fascia covering the lateral surface of the latissimus dorsi

I: olecranon of ulna; in common with tendon of insertion of the triceps brachia

Action: extend elbow

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11
Q

triceps brachii

A

O: caudal border (long head); proximal humerus and tricipital line (other head)

I: olecranon of ulna

Action: extend elbow (all heads) and flex shoulder (long head)

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12
Q

anconeus

A

O: lateral supracondylar crest of the humerus; lateral and medial epicondyle of the humerus

I: proximal and lateral aspect of the ulna

Action: extend elbow

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13
Q

biceps brachii

A

O: supraglenoid tubercle of scapula

I: radial and ulnar tuberosities

Action: flex elbow; extend shoulder

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14
Q

brachialis

A

O: brachialis groove (proximal and lateral aspect of humerus)

I: radial and ulnar tuberosities

Action: flex elbow

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15
Q

extensor carpi radialis

A

O: lateral supracondylar crest of the humerus

I: metacarpal tuberosities of MC II and III

Action: extend carpus

***Horse: inserts at MC III

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16
Q

common digital extensor

A

O: lateral epicondyle of the humerus

I: extensor processes of the distal phalanx of digits 2, 3, 4, and 5.

Action: extend the joints of digits 2, 3, 4, and 5

Lateral digital extensor and lateral and medial extensor branches of the interosseous converge with common digital extensor in the horse!!!

17
Q

lateral digital extensor

A

O: lateral epicondyle of the humerus

I: extensor processes of the distal phalanx of digits 3, 4, and 5

Action: extend the joints of digits 3, 4, and 5

18
Q

ulnaris lateralis

A

O: lateral epicondyle of the humerus

I: lateral aspect of the proximal end of MC V; accessory carpal bone

Action: flex carpus; abduct carpus

19
Q

supinator

A

O: lateral epicondyle of the humerus

I: cranial aspect of the proximal radius

Action: supination (rotating antebrachium laterally, so the palmar surface of paw faces medially)

20
Q

pronator teres

A

O: medial epicondyle of humerus

I: medial border of the radius

Action:pronation (rotate antebrachium medially so that palmar surface of paw faces ground)

21
Q

flexor carpi radialis

A

O: medial epicondyle of the humerus

I: palmar surface of proximal aspect of MC II and III

22
Q

superficial digital flexor

A

O: medial epicondyle of humerus

I: palmar surface of proximal aspect of middle phalanges of digits 2, 3, 4, and 5

Action: flex carpus; flex digits 2, 3, 4, and 5

23
Q

flexor carpi ulnaris

A

O: medial epicondyle of humerus; olecranon

I: accessory carpal bone

Action: flex carpus

24
Q

deep digital flexor

A

O: medial epicondyle of humerus; radius; ulna

I: flexor tubercle of distal phalanx of each digit

Action: flex carpus; flex digits

25
Q

What are the borders of the carpal canal?

A

Dorsal: palmar carpal ligament
Lateral:accessory carpal bone
Palmar: flexor retinaculum

26
Q

What muscles are present in the carpal canal?

A

Dog:

  • flexor carpi radialis
  • deep digital flexor

Horse:

  • superficial digital flexor
  • deep digital flexor
  • flexor carpi radialis

Anatomy (9 decks)

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