Muscles in Anterior Compartment of Arm

Question 1

What are all of these muscles innervated by?

Answer 1

Musculocutaneous nerve

Question 2

Coracobrachialis: Origin and Insertion

Answer 2

Origin: From coracoid process
Insertion: Half-way down medial aspect of humerus

Question 3

Coracobrachialis: Action

Answer 3

Adducts arm

Question 4

Biceps Brachii: Origin and Insertion

Answer 4

Origin: From supraglenoid tubercle (long head) and coracoid process (short head)
Insertion: Radial Tuberosity

Question 5

Biceps Brachii: Action

Answer 5

Flexes shoulder, flexes forearm at elbow and supinates forearm

Question 6

Brachialis: Origin and Insertion

Answer 6

Origin: From lower anterior half of humerus

Insertion: On ulnar tuberosity

Question 7

Brachialis: Action

Answer 7

Flexes forearm at elbow

Question 8

What does the brachialis form a part of?

Answer 8

Forms floor of cubital fossa