Title 1 Anatomy LMV 5.2.pdf ✅

1 | P a g e [ A n a t o m y ] © Copyright www.plab1keys.com (Constantly updated for online subscribers) Copyrights @ Plab1Keys.com Anatomy Version 5.2 Corrected, Updated, Lighter PLAB 1 Keys is for PLAB-1 and UKMLA-AKT (Based on the New MLA Content-Map) With the Most Recent Recalls and the UK Guidelines ATTENTION: This file will be updated online on our website frequently! (example: Version 2.7 is more recent than Version 2.6, and so on) Key 1 Important Nerve Injuries with the Resulted Defects Motor Sensory Typical mechanism of injury & notes Musculo- cutaneous nerve (C5-C7) Elbow flexion (supplies biceps brachii) and supination Lateral part of the forearm Isolated injury is rare usually injured as part of brachial plexus injury Plab1keys.com Strict Copyrights! No Sharing or Copying Allowed by any means. Compensations and Penalties Worldwide System is Active
2 | P a g e [ A n a t o m y ] © Copyright www.plab1keys.com (Constantly updated for online subscribers) Copyrights @ Plab1Keys.com Axillary nerve (C5, C6) Shoulder abduction (deltoid muscle) Inferior region of the deltoid muscle Humeral neck fracture/dislocation Results in → flattened deltoid Radial nerve (C5-T1) Extension (forearm, wrist, fingers, thumb) Small area between the dorsal aspect of the 1st and 2 nd metacarpals Humeral midshaft fracture Palsy results in → wrist-drop Median nerve (C6-T1) LOAF muscles Features depend on the site of the lesion: wrist: paralysis of thenar muscles, opponens pollicis elbow: loss of pronation of forearm and weak wrist flexion Palmar aspect of lateral 31⁄2 fingers Wrist lesion → carpal tunnel syndrome
3 | P a g e [ A n a t o m y ] © Copyright www.plab1keys.com (Constantly updated for online subscribers) Copyrights @ Plab1Keys.com Ulnar nerve (C8, T1) Intrinsic hand muscles except LOAF Wrist flexion Medial 11⁄2 fingers Medial epicondyle fracture Damage may result in → claw hand Long thoracic nerve (C5-C7) Serratus anterior Often during sport e.g. following a blow to the ribs, lifting weights. Also, a possible complication of mastectomy Damage results in → winged scapula √ LOAF muscles: • Lateral two lumbricals • Opponens pollis • Abductor pollis brevis • Flexor pollis brevis A young man presents with sudden pain in the chest while lifting weights. He is unable to lift the arm above the head, difficulty in abducting his left hand beyond 90, when the arm is stretched out against resistance, the scapula is noticed to be prominent. Injury to which of the following nerves is affected? A. Dorsal scapula nerve B. Long thoracic nerve
4 | P a g e [ A n a t o m y ] © Copyright www.plab1keys.com (Constantly updated for online subscribers) Copyrights @ Plab1Keys.com C. Posterior interosseus nerve D. Axillary nerve E. Thoracodorsal nerve Long thoracic nerve (C5-C7) Serratus anterior Often during sport e.g. following a blow to the ribs, lifting heavy objects. Also, possible complication of mastectomy Damage results in a winged scapula When long thoracic nerve “that innervates serratus anterior muscle” is injured: √ The pain will be more severe on contralateral tilting of head (i.e. if the right scapula is affected, tilting the head to the left increases the pain”. √ On performing push-ups against a wall, the scapula winging increases.