Muscles of the Arm

Question 1

Muscles in the Anterior Flexor compartment of the brachium?

Answer 1

Biceps Brachii (most superficial)
Brachialis
Coracobrachialis

Question 2

Muscles in the Posterior Extensor compartment of the brachium?

Answer 2

Triceps Brachii

Question 3

Anterior and Posterior compartments are separated by which structure?

Answer 3

Intermuscular septum (medial and lateral aspects)

Question 4

Function of Biceps Brachii

Answer 4

Flexor of the forearm at the elbow joint

Supination of the forearm when flexed

Question 5

Origins of Biceps Brachii

Answer 5

Supraglenoid Tubercle (via Intertubercular sulcus under the Transverse humeral ligament)- LONG HEAD

Apex of Coracoid Process- SHORT HEAD

Question 6

Insertion of Biceps Brachii

Answer 6

Radial Tuberosity

Gives off the Bicipital Aponeurosis which joins with the deep fascia of the forearm

Question 7

Innervation of the Biceps Brachii

Answer 7

Musculocutaneous Nerve

Question 8

Function of Brachialis

Answer 8

Primary flexor of the forearm at the elbow joint

Question 9

Origin of Brachialis

Answer 9

Anterior aspect of Humerus

Question 10

Insertion of Brachialis

Answer 10

Ulnar Tuberosity

Question 11

Innervation of Brachialis

Answer 11

Musculocutaneous Nerve

Small contribution from the radial n.

Question 12

Function of Coracobrachialis

Answer 12

Flexes the arm at the shoulder joint

Adducts the humerus

Question 13

Origin of Coracobrachialis

Answer 13

Apex of Coracoid process of the Humerus

Question 14

Insertion of Coracobrachialis

Answer 14

Medial humerus

Question 15

Innervation of Coracobrachialis

Answer 15

Musculocutaneous Nerve

Question 16

Function of Triceps Brachii

Answer 16

Sole extensor of the forearm at the elbow

Question 17

Origin of Triceps Brachii

Answer 17

Long Head: Infraglenoid Tubercle of Scapula

Lateral Head: Posterior Humerus, Above Spiral Groove

Medial head: Posterior Humerus, Below Spinal Groove)

(the spiral groove is the depression in which the radial nerve and brachial artery run)

Question 18

Insertion of Triceps Brachii

Answer 18

Olecranon Process of the Ulna

Question 19

Innervation of Triceps Brachii

Answer 19

Radial Nerve