Muscles of the anterior compartment of the arm (flexors) JO

Question 1

Name this muscle:
State its Origin(s), Insertion(s), Innervation(s), and Action(s)

Answer 1

Coracobrachialis
Origin: Coracoid process of scapula
Insertion: Middle ⅓ of the medial surface of the humerus
Innervation: Musculocutaneous nerve (C5, C6, C7)
Action: Flexion and adduction of the shoulder joint

Question 2

Name this muscle:
State its Origin(s), Insertion(s), Innervation(s), and Action(s)

Answer 2

Biceps Brachii
Origin: Long head: supraglenoid tubercle of scapula;
short head: coracoid process of the scapula
Insertion: Radial tuberosity and fascia of the forearm via
bicipital aponeurosis
Innervation: Musculocutaneous nerve (C5, C6)
Action: Flexes the elbow joint when forearm is supinated; supinates forearm; flexes the shoulder joint

Question 3

Name this muscle:
State its Origin(s), Insertion(s), Innervation(s), and Action(s)

Answer 3

Brachialis
Origin: Distal ½ of anterior surface of the humerus
Insertion: Coronoid process and tuberosity of ulna
Innervation: Musculocutaneous nerve (C5, C6)
Action: Flexes the elbow joint (regardless of forearm position)