Anatomy Muscles of Arm Dr Sana Khan MGM

Compartments of the Arm • The arm is divided into anterior and posterior compartments

Anterior Compartment Muscles of the anterior compartment of the arm are : 1. Coracobrachialis

Transverse section through the distal one-third of the arm, showing the intermuscular septa and

Coracobrachialis Origin: Tip of coracoid process of scapula along with short head of biceps

Origin: Short head from tip of the coracoid process of scapula. Long head

� Insertion : Posterior rough part of radial tuberosity. � The deep fascia on

Origin : Lower half of the anterior surface of the humerus. Insertion :

Nerve Supply : Musculocutaneous Nerve. (Mainly) Radial Nerve. Actions : Flexion of the

Testing biceps brachii against resistance

POSTERIOR COMPARTMENT Contains triceps brachii muscle, the radian nerve and the profunda brachii artery.

Insertion The long and lateral covers the medial head and are inserted into the

Testing triceps brachii against resistance

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Anatomy Muscles of Arm Dr Sana Khan MGM Medical College, A’bad

Compartments of the Arm • The arm is divided into anterior and posterior compartments by medial and lateral intermuscular septa.

Anterior Compartment Muscles of the anterior compartment of the arm are : 1. Coracobrachialis 2. The Biceps brachii and 3. Brachialis.

Posterior Compartment Triceps Brachii

Transverse section through the distal one-third of the arm, showing the intermuscular septa and the compartments

Coracobrachialis Origin: Tip of coracoid process of scapula along with short head of biceps brachii muscles. Insertion : The middle 5 cm of medial border of shaft of humerus. Nerve supply : Musculocutaneous nerve. (C 5 -C 7) Actions : Helps in flexion and adduction of the arm.

Biceps Brachii Muscle

Origin: Short head from tip of the coracoid process of scapula. Long head from supraglenoid tubercle of ther scapula.

� Insertion : Posterior rough part of radial tuberosity. � The deep fascia on the medial aspect by its aponeurosis(bicipital apouneurosis). � Nerve Supply : Musculocutaneous Nerve. (C 5 -C 7). � Action : Supination of the forearm when the elbow is flexed.

Brachialis Muscles

Origin : Lower half of the anterior surface of the humerus. Insertion : On the anterior surface of coronoid process of the ulna including ulnar tuberosity.

Nerve Supply : Musculocutaneous Nerve. (Mainly) Radial Nerve. Actions : Flexion of the forearm in all position.

Testing biceps brachii against resistance

Triceps brachii

POSTERIOR COMPARTMENT Contains triceps brachii muscle, the radian nerve and the profunda brachii artery. Triceps Brachii Muscle Origin 1. The long head arises from the infraglenoid tubercle of the scapula. 2. The lateral head arises from an oblique ridge on the upper part of the posterior surface of the humerus. 3. The medial head arises from a large triangular area on the posterior surface of the humerus below the radial groove.

Insertion The long and lateral covers the medial head and are inserted into the posterior part of the superior surface of the olecranon process. Nerve Supply Each head receives a separate branch from the radial nerve (C 7, C 8). The branches arise in the axilla and in the radial groove. Actions The triceps is a powerful active extensor of the elbow. Gravity extends the elbow passively.

Testing triceps brachii against resistance

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