Muscle Chart: The Brachium

Question 1

Biceps Brachii

Origin, Insertion, Innervation, Blood Supply

Answer 1

Origin: Long head — supraglenoid tubercle of scapula; Short head — coracoid process of the scapula

Insertion: Radial tuberosity and bicipital aponeurosis

Innervation: Musculotaneous Nerve (C5, C6, C7)

Blood Supply: Brachial Artery

Question 2

Biceps Brachii Movements

Answer 2

• Flexes elbow
• Flexes shoulder
• Supinates forearm

Question 3

Brachialis

Origin, Insertion, Innervation, Blood Supply

Answer 3

Origin: Anterior surface of distal humerus

Insertion: Coronoid process and tuberosity of the ulna

Innervation: Musculocutaneous Nerve (C5, C6) and partial from Radial Nerve (C5, C7)

Blood Supply: Brachial Artery

Question 4

Brachialis Movements

Answer 4

-Flexes elbow

Question 5

Coracobrachialis

Origin, Insertion, Innervation, Blood Supply

Answer 5

Origin: Coracoid process of the scapula

Insertion: Medial surface of mid humeral shaft

Innervation: Musculocutaneous Nerve (C5, C6)

Blood Supply: Brachial Artery

Question 6

Coracobrachialis Movements

Answer 6

• Flexes shoulder

- Adducts shoulder

Question 7

Triceps

Origin, Insertion, Innervation, Blood Supply

Answer 7

Origin: Long Head — infraglenoid tubercle of scapula; Lateral Head — posterior proximal humerus; Medial Head — posterior surface of distal half of humerus

Insertion: Olecranon of ulna and forearm fascia

Innervation: Radial Nerve (C6, C7, C8 and T1)

Blood Supply: Deep artery of the arm (Profunda brachii artery)

Question 8

Triceps Movements

Answer 8

• Extends the elbow

- Long Head — Extends and adducts shoulder

Question 9

Anconeus

Origin, Insertion, Innervation, Blood Supply

Answer 9

Origin: Lateral epicondyle of humerus

Insertion: Olecranon and posterior proximal ulna

Innervation: Radial Nerve (C6, C7, C8, T1)

Blood Supply: Not specified in muscle chart

Question 10

Anconeus Movements

Answer 10

-Extends the elbow but more likely pulls the capsule away from the joint to avoid impingement