Intrinsic muscles of the forelimb Flashcards Preview

Anatomy > Intrinsic muscles of the forelimb > Flashcards

Flashcards in Intrinsic muscles of the forelimb Deck (12)
Loading flashcards...
1

Supraspinatus

Origin: supraspinous fossa, part of the spine of the scapula, and neck of the scapula.

Insertion: major tubercle of the humerous.

Innervation: Suprascapular nerve.

Action: extension of the shoulder

2

Infraspinatus

Origin: Infraspinous fossa, spine of the scapula

Insertion: Lateral aspect of greater tubercle of the humerous.

Innervation: Suprascapular nerve

Action: flexes the shoulder and some abduction

3

Teres Minor

Origin: Infraglenoid tubercle

Insertion: Tricipital line proximal to deltoid tuberosity.

Innervation: Axillary nerve

Action: flexion of the shoulder

4

Deltoideus

Origin: Acromiun and spine of the scapula

Insertion: Deltoid tuberosity

Innervation: Axillary nerve

Action: Flexion, maybe abduction

5

Subscapularis

Origin: Subscapular fossa of the scapula

Insertion: lesser tubercle of the humerous

Insertion: Subscapular and axillary nerves

Action: minor adduction, maybe some flexion and extension

6

Teres Major

Origin: Caudal angle of the scapula

Insertion: Teres tubercle

Innervation: axillary nerve

Action: flexion

7

Corachobrachialis

Origin: Coracoid process

Insertion: close to teres tubercle

Innervation: musculocutaneous nerve

Action: it is a vestigial muscle...may help to extend shoulder

8

Triceps Brachii

Origin: Long head from the caudal border of the scapula, lateral head from tricipital line,
medial head from proximal medial shaft close to teres tubercle, and accessory head from
neck of the humerus.

Insertion: olecranon

Innervation: radial nerve

Action: flexes shoulder and extends elbow

9

Tensor fasciae antebrachii

Origin: from the latissimus dorsi

Insertion: Olecranon

Innervation: radial nerve

Action: elbow extension

10

Biceps brachii

origin: supraglenoid tubercle

insertion: radial and ulnar tuberosities

innervation: musculocutaneous nerve

action: flexion of elbow and extension of shoulder

11

Brachialis

Origin: caudal aspect and neck of the radius

Insertion: radial and ulnar tuberosities

Innervation: musculocutaneous nerve

Action: flex elbow

12

Anconeus

Origin: Lateral epicondylar crest, lateral epicondyle, partly fromthemedial epicondyle.

Insertion: proximolateral aspect of the ulna

Innervation: radial nerve

Action: elbow extension