University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

48

Pages:

8
Author:

Mariam A. A.

ANATOMY OF THE ARM Anterior compartment Muscle Origin Insertion Coracobrachialis Tip of coracoid process Mid 1/3 of humerus Biceps brachii • Long head: Radial tuberosity supraglenoid tubercle • Short head: coracoid process (apex) Brachialis Distal portion of ant. Tuberosity of ulna Humerus Innervation Musculocutaneous (C5-7) Musculocutaneous nerve (C5,6) Function Flex + adduct arm Secondary supination flexor + Musculocutaneous Primary forearm flexor nerve (C5,6) + (MVP!) sometimes radial (C7) Posterior Compartment Muscle Triceps Brachii Origin Insertion • Long head: Olecranon infrageneric tubercle (scapula) • Medial + lateral heads: posterior surface of humerus Innervation Function Radial nerve (C6- Elbow extension 8) Blood Vessels of the Upper Limb Arteries Axillary Artery Origin Subscapular Branch of third segment of the axillary artery Course Major Branches • Thoracodorsal artery, circumflex scapular artery • arises after the lateral thoracic artery at the level of the inferior margin of the subscapularis muscle. runs inferolateral on the posterior axillary wall, following the lateral border of the subscapular muscle. Anterior lateral side of Encircle surgical neck of humerus, Descending humeral the axillary anastomosing with each other branch circumflex artery laterally, larger posterior branch artery traverses’ quadrangular space (Smaller than the posterior one) structures or regions supplied by this artery Deltoid muscle, latissimus dorsi muscle, long head of triceps brachii muscle, subscapularis muscle, supraspinatus muscle, infraspinatus muscle, serratus anterior muscle, adjacent skin On reaching the intertubercular sulcus, it gives off a branch which ascends in the sulcus to supply the head of the humerus and the shoulder joint. Posterior humeral circumflex artery Third part of Encircle surgical neck of humerus, Descending the axillary anastomosing with each other branch artery laterally, larger posterior branch traverses’ quadrangular space Glenohumeral (shoulder) joint, deltoid muscle, teres major muscle, teres minor muscle, and long and lateral heads of the triceps muscle Brachial Artery Artery Origin Profunda Brachial brachii artery Course Accompanies radial nerve along radial groove of humerus, supplying posterior compartment of arm and participating in periarticular arterial anastomosis around elbow joint Major Branches structures or regions supplied by this artery