Anterior Arm and Musculocutaneous Nerve

Question 1

The head of the humerus

Answer 1

Connected to the greater and lesser tubercles by the anatomical neck

Question 2

Greater Tubercle of the Humerus

Answer 2

Located on the lateral aspect of the humerus. It has both and anterior and posterior face. It serves for the attachment site f three rotator cuff muscles - supraspinatus, infraspinatus and teres major.

Question 3

Lesser tubercle of the humerus

Answer 3

Medially located with only an anterior face. It is a place of attachement for subscapularis.

Question 4

Intertubercular sulcus or groove

Answer 4

Deep depression seperating the greater and the lesser tubercles.

Question 5

What tendon runs through the intertubercular sulcus

Answer 5

The tendon of the long head of biceps brachii

Question 6

Deltoid Tuberosity

Answer 6

Attachement of the deltoid muscle. It is located on the lateral side of the humeral shaft.

Question 7

The radial groove

Answer 7

Shallow depression that runs diagonally down the posterior portion of the humerus, parallel to the deltoid tuberosity. The radial nerve and the profunda brachii artery lie in this groove.

Question 8

Muscles attaching to the anterior humeral shaft

Answer 8

Coracobrachialis, deltoid, brachialis, brachioradialis

Question 9

Muscles attaching to the posterior humeral shaft

Answer 9

Medial and lateral heads of the triceps

Question 10

Sign of humeral shaft fracture

Answer 10

Wrist drop

Question 11

Which nerve passes into the forearm along the posterior side of the medial epicondyle of the humerus

Answer 11

The ulnar nerve

Question 12

Trochlea

Answer 12

Located distally and medial and extends onto the posterior of the bone.

Question 13

Capitulum

Answer 13

Lateral to the trochlea and articulates with the radius

Question 14

Three depressions found on the distal portion of the humerus

Answer 14

Coronoid, radial and olecranon fossas. They accommodate the forearm bones during movement at the elbow.

Question 15

Articulation with the ulna

Answer 15

Trochlea

Question 16

Muscles of the anterior compartment of the arm

Answer 16

Biceps Brachii, Brachialis and Coracobrachialis. Innervated by the musculocutaneous nerve. BBC. Arterial supply is via the brachial artery

Question 17

Muscle in the posterior compartment of the upper limb

Answer 17

Triceps Brachii

Question 18

Attachments of Biceps Brachii

Answer 18

Long head originates from the supraglenoid tubercle of the scapula and the short head originates from the coracoid process of the scapula. Both heads insert distally into the radial tuberosity and the fascia of the forearm via the bicipital aponeurosis

Question 19

Function of Biceps Brachii

Answer 19

Supination of the forearm, flexion of the arm at the elbow and the shouldr.

Question 20

Innervation of the Biceps Brachii

Answer 20

Musculocutaneous nerve.

Question 21

Attachment of coracobrachialis

Answer 21

Coracoid process of the scapula. The muscle passes through the axilla and attaches the medial side of the humeral shaft, at the level of the deltoid tubercle.

Question 22

Function of Coracobrachialis

Answer 22

Flexion at the shoulder and weak adduction

Question 23

Innervation of Coracobrachialis

Answer 23

Musculocutaneous Nerve

Question 24

Brachialis attachments

Answer 24

Medial and lateral surfaces of the humeral shaft and inserts into the ulna tuberosity, distal to the elbow joint.

Question 25

Function of Brachialis

Answer 25

Flexion at elbow

Question 26

Innervation of Brachialis

Answer 26

Musculocutaneous nerve, with contributions from the radial nerve

Question 27

From which chord does the musculocutaneous nerve arise

Answer 27

The lateral chord

Question 28

From which part of the forearm does the musculocutaneous nerve give cutaneous sensations

Answer 28

Lateral aspect of the forearm