Arm Anatomy: Fascia, Septa, Muscles' Origin, Insertion, Action, Nerve Supply, Exams of Abnormal Psychology

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The Muscles and Fasciæ of the

Arm

Brachial Fascia ( fascia brachii; deep

fascia of the arm )

• (^) Continuous with fascia covering the Deltoideus and the

Pectoralis major

• (^) On either side it gives off a strong intermuscular

septum, which is attached to the corresponding

supracondylar ridge and epicondyle of the humerus

• (^) At the elbow, the deep fascia is attached to the

epicondyles of the humerus and the olecranon of the

ulna, and is continuous with the deep fascia of the

forearm

• (^) Just below the middle of the arm, on its medial side, is

an oval opening in the deep fascia, which transmits the

basilic vein and some lymphatic vessels

Medial intermuscular septum

• Extends from the lower part of the crest of the

lesser tubercle of the humerus below the Teres

major, along the medial supracondylar ridge to

the medial epicondyle

• Blended with the tendon of the Coracobrachialis

• Affords attachment to the Triceps brachii behind

and the Brachialis in front

• Perforated by the ulnar nerve, the superior ulnar

collateral artery, and the posterior branch of the

inferior ulnar collateral artery

The Muscles of the Arm

• Coracobrachialis

• Biceps brachii

• Brachialis

• Triceps brachii

The Biceps brachii

( Biceps; Biceps flexor cubiti )

• (^) ORIGIN Long head: supraglenoid tuberosity at the upper margin of the glenoid cavity, continuous with the glenoidal labrum Short head: apex of the coracoid process, in common with the Coracobrachialis
• (^) INSERTION posterior border of bicipital tuberosity of radius (over bursa) and bicipital aponeurosis to deep fascia and subcutaneous ulna
• (^) ACTION Supinates forearm, flexes elbow, weakly flexes shoulder
• (^) NERVE Musculocutaneous nerve (C5, 6) (from lateral cord)

The Brachialis ( Brachialis anticus )

• (^) ORIGIN lower half of the front of the humerus, commencing above at the insertion of the Deltoideus medial & lateral intermuscular septa
• (^) INSERTION Coronoid process and tuberosity of ulna
• (^) ACTION Flexes elbow
• (^) NERVE Musculocutaneous nerve (C5, 6) ( from lateral cord). Also small supply from radial nerve (C7)

Muscle Arterial Supply Nerve Supply coracobrachialis brachial a. musculocutane ous nerve (C5,6) biceps brachii brachial a. musculocutane ous nerve (C5,6) brachialis brachial a., radial recurrent a. musculocutane ous nerve (C5,6) triceps brachii deep brachial (profunda brachii) a. radial nerve