Cat Muscles - Upper Arm Muscles

Question 1

Triceps brachii

• long head

Answer 1

Origin: Scapula, from the glenoid border
Insertion: Olecranon process of ulna
Action: Extensor of forearm

Question 2

Triceps brachii

• lateral head

Answer 2

Origin: Greater tuberosity & deltoid region of humerus
Insertion: Olecranon process of ulna
Action: Extensor of forearm

Question 3

Triceps brachii

• medial head

Answer 3

Origin: Dorsal surface of humerus
Insertion: Olecranon process of ulna
Action: Extensor of forearm

Question 4

Triceps brachii

• Anconeus

Answer 4

Origin: Distal end of humerus
Insertion: Lateral surface of ulna
Action: Strengthens elbow joint

Question 5

Epitrochlearis

Answer 5

Origin: Latissimus dorsi
Insertion: Olecranon
Action: Extensor of forearm; rotates the ulna

Question 6

Biceps brachii

Answer 6

Origin: Supraglenoid tubercle of scapula
Insertion: Bicipotal tuberosity of radius
Action: Flexes forearm, assists in supination of forearm (rotate hand up)

Question 7

Brachialis

Answer 7

Origin: Lateral surface of humerus
Insertion: Ulna
Action: Flexes forearm; assists in supination of forearm