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3 An area of transition between neck & arm Pyramidal space inferior to shoulder, at the junction of the arm and thorax Distribution center for the neurovascular structures that serve the upper limb

4 Superiorlycervico-axillary canalneck Superiorly [cervico-axillary canal] neck Anteriorlclavipectoral trianglepectoral Inferiorly & laterally limb itself Anteriorly [clavipectoral triangle] pectoral Inferiorly & laterally limb itself Posteriorly Posteriorly quadrangular space scapular

5 Lateral wall Posterior wall

6 Axillary nerve vein Posterior circumflex humeral artery & vein Circumflex scapular artery & vein Radial nerve profunda brachii artery Radial nerve & profunda brachii artery

7 Axillary vein Axillary artery Brachial plexus

8 Pectoralis minor superior thoracic artery 2 3

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12 union of the anterior rami of the last 4 cervical (C5-C8) & first thoracic (T1) nerves

13 The parts of the brachial plexus, from medial to lateral roots, trunks, divisions, & cords. All major nerves that innervate the upper limb originate from the brachial plexus, mostly from the cords

14

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16 The

17 Superficialextrinsicshouldermuscles Deepextrinsicshouldermuscles

18 X Deltoid

19 Form a musculotendinous rotator cuff around the glenohumeral joint.

20 Deltoid & teres minor

21

 Arm is the region of the upper limb between the shoulder and the elbow.  The superior aspect of the arm communicates medially with the axilla.  Inferiorly, a number of important structures pass between arm & forearm through cubital fossa, positioned anterior to the elbow joint. 22

23 Coracobrachialis innervated predominantly by musculocutaneous nerve. Brachialis Biceps brachii coracoid process of scapula Supinates forearm Flexes forearm Flexes forearm in all positions Helps flex and adduct arm; resists dislocation of shoulder

24 infraglenoid tubercle of scapula posterior surface of humerus, inferior to radial groove posterior surface of humerus, superior to radial groove posterior surface of humerus, inferior to radial groove Proximal end of olecranon of ulna fascia of forearm

25 Superior ulnar collateral artery Inferior ulnar collateral artery Profunda brachii artery Nutrient arteries to the humerus

26 TWO SUPERFICIAL VEINS OF THE ARM basilica Medial of the two inside the church

27 Median nerve  vertically down the medial side of the arm in the anterior compartment  no major branches in the arm or in the axilla. Ulnar nerve the most medial side of the arm in the anterior compartment Musculocutanous nerve Passes through the coracobrachialis emerges laterally to the tendon of the biceps brachii at the elbow

28 Radial nerve Anterior to the lateral epicondyle, divides into: Deep branch (motor) Superficial branch(sensory) Cutaneous branches inferior lateral cutaneous nerve of arm posterior cutaneous nerve of forearm