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WINDSOR UNIVERSITY SCHOOL OF MEDICINE St.Kitts

WINDSOR UNIVERSITY SCHOOL OF MEDICINE St.Kitts. DEPARTMENT OF ANATOMY. Dr. SREEKANTH THOTA. UPPER LIMB. Arm. ARM . The arm is the region of the upper limb between the shoulder and the elbow. The arm is divided into two compartments by medial and lateral intermuscular septa.

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WINDSOR UNIVERSITY SCHOOL OF MEDICINE St.Kitts

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  1. WINDSOR UNIVERSITYSCHOOL OF MEDICINESt.Kitts DEPARTMENT OF ANATOMY Dr. SREEKANTH THOTA UPPER LIMB Arm

  2. ARM The arm is the region of the upper limb between the shoulder and the elbow. The arm is divided into two compartments by medial and lateral intermuscular septa. The anterior compartment of the arm contains muscles that predominantly flex the elbow joint; the posterior compartment contains muscles that extend the joint.

  3. Arm

  4. Anterior compartment Muscles : Coracobrachialis, brachialis, and biceps brachii Nerve: Musculocutaneous nerve.

  5. Biceps brachii Origin:Long head-supraglenoid tubercle of scapula Short head-apex of coracoid process Insertion: Radial tuberosity N. supply:Musculocutaneous nerve Action: Powerful flexor of the forearm at the elbow joint and supinator of the forearm.

  6. Coracobrachialis Origin: Apex of coracoid process Insertion: Medial aspect of shaft of humerus N. supply:Musculocutaneous nerve Action: Flexor of the arm at the gleno-humeral joint

  7. Brachialis Origin: Front of lower half of humerus Insertion:Coronoid process of ulna N. supply: Musculocutaneous nerve Action: Flexor of elbow joint

  8. Posterior compartment Muscle : Triceps brachii muscle Nerve: Radial nerve

  9. Triceps brachii muscle Origin:Long head-infraglenoid tubercle of scapula Medial head-posterior suface of humerus Lateral head-posterior surface of humerus Insertion:ULNA N. supply: RADIAL NERVE ACTION: Extensor of elbow joint

  10. Anconeus Origin:Lateralepicondyle of humerus Insertion:superior part of posterior surface of ulna N. supply: RADIAL NERVE Action accessory extensor of the elbow joint

  11. Nerves 1. Musculocutaneous nerve 2. Radial nerve 3. Median nerve 4. Ulnar nerve

  12. Musculocutaneous nerve After giving rise to motor branches in the arm, it emerges laterally to the tendon of the biceps brachii muscle at the elbow, penetrates deep fascia, and continues as the lateral cutaneous nerve of forearm.

  13. Fractures of Humerus • Surgical Neck :Axillary Nerve • Mid Shaft :Radial Nerve • Supracondylar :Median Nerve • Medial Epicondyle :Ulnar Nerve

  14. SATURDAY NIGHT PALSY • Radial Nerve Injury in Axilla: • Mechanism: • Crutches pressing in axilla • Saturday night palsy! Main Effect: WRIST DROP

  15. Medial Epicondyle :Ulnar Nerve

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