Basic Anatomy MCQs on Arm MPT Preparation Quiz

INTRODUCTION-- The arm extends from the shoulder joint till the elbow joint. The skeleton of the arm is a 'solo' bone, the humerus. Medial and lateral intermuscular septa divide the arm into an anterior or flexor compartment and a posterior or extensor compartment, to give each compartment its individuality and freedom of action. Since the structures in the front of arm continue across the elbow joint into the cubital fossa, the cubital fossa is also included in this chapter. The arm is called brachium, so most of the structures in this chapter are named accordingly, like brachialis, coracobrachialis and brachial artery.

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                     Surface Landmarks 

The following landmarks can be felt in the living subject. 

1 The greater tubercle of the humeras is the most lateral bony point in the shoulder region. It can be felt just below the acromion, deep to the deltoid when the arm is by the side of the trunk . 

2 The shaft of the humerus is felt only indistinctly because it is surrounded by muscles in its upper half. In the lower half, the humerus is covered anteriorly by the biceps brachii and brachialis, and posteriorly by the triceps brachii. 

3 The medial epicondyle of the humerus is a prominent bony projection on the medial side of the elbow. It is best seen and felt in a mid-flexed elbow. 

4 The lateral epicondyle of the humeras is less prominent than the medial. It can be felt in the upper part of the depression on the posterolateral aspect of the elbow in the extended position of the forearm. 

5 The medial and lateral supracondylar ridges are better defined in the lower portions of the medial and lateral borders of the humerus. They can be felt in the lower one-fourth of the arm as upward continuations of the epicondyles. 

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6.The deltoid forms the rounded contour of the shoulder. The apex of the muscle is attached to the deltoid tuberosity located at the middle of the anterolateral surface of the humerus. 

7.The coracobrachialis forms an inconspicuous rounded ridge in the upper part of the medial side of the arm. Pulsations of the brachial artery can be felt in the depression behind it. 

8.The biceps brachii muscle is overlapped above by the pectoralis major and by the deltoid. Below these muscles the biceps forms a conspicuous elevation on the front of the arm. Upon flexing the elbow, the contracting muscle become still more prominent. The tendon of the biceps can be felt in front of the elbow. The tendon is a guide to the brachial artery which lies on its medial side. 

9 The brachial artery can be felt in front of the elbow joint just medial to the tendon of the biceps brachii. Brachial pulsations are used for recording the blood pressure. 

10 The ulnar nerae can be rolled by the palpating finger behind the medial epicondyle of the humerus. During leprosy this nerve becomes thick and enlarged. 

11 The superficial cubital veins can be made more prominent by applying tight pressure round the arm and then contracting the forearm muscles by clenching and releasing the fist a few times. The cephalic vein runs upwards along the lateral border of the biceps. The basilic vein can be seen along the lower half of the medial border of the biceps. The cephalic and basilic veins are connected together in front of the elbow by the median cubital vein which runs obliquely upwards and medially.

Some Basic Anatomy MCQs on Arm MPT Preparation Quiz Below 👇👇👇👇👇

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Basic Anatomy quiZ on Arm

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