Forelimb Intrinsics

Question 1

Infraspinatus

Answer 1

O: infraspinatus fossa

I: lateral greater tubercle of humerus between supraspinatus and teres minor tendons

A: shoulder flexor (or extends), ABducts shoulder, rotates arm lateraally and jt stabilizer

Question 2

Supraspinatus

Answer 2

O: supraspinatus fossa

I: greater tubercle of humerus with a thick tendon cranial to infraspinatus tendon

A: Extends shoulder

Question 3

Teres minor

Answer 3

O: distal 1/3 of the caudal border of the scapula and infraglenoid tubercle

I: greater tubercle of humerus caudal to the tendon of the infraspinatus

A: shoulder flexor and externally rotates arm

Question 4

Deltoideus

Answer 4

O: spine of scapula and acromion

I: deltoid tuberosity

A: shoulder flexor and ABducts humerus

Question 5

Teres major

Answer 5

O: caudal angle and border of scapula

I: (medially) teres major tuberosity

A: shoulder flexor and medially rotates arm

Question 6

subscapularis

Answer 6

O: subscapular fossaa

I: lesser tubercle

A: ADducts and EXTends shoulder

Question 7

anconeus

Answer 7

O: distal humerus just proximal to elbow (lateral epicondylar crest and lateral and medial epicondyles)

I: lateral surface of proximal 1/8th of ulna

A: EXTends elbow

Question 8

Triceps

Answer 8

O:
(3 HUMERAL heads)
1) Medial- medial surface of humerus
2) Lateral- tricipital line of humerus
3) Accessory - neck of humerus
4) (SCAPULAR head)- caudal border of scapula

I: olecranon

A: EXTend elbow and (long head only) flexes shoulder

Question 9

biceps brachii

Answer 9

O: supraglenoid tubercle

I: ulna and radius tuberosities medially just distal to elbow

A: flexes elbow and shoulder EXTender