Lesion of the marked structure leads to:
Ans. (A) Loss of sensation of tip of index finger dorsal side(Ref: Gray's Anatomy 41st Ed; Page No- 889)The marked area is Median Nerve.Injury to the medial nerve in cubital fossa can lead to sensory loss on lateral 31/2 of palmar region along with the respective nail bed.Summary of Muscle Innervations of the Upper LimbMusculocutaneous nerveMuscles of the Anterior Compartmentof the Arm* Brachialis* Coracobrachialis* Biceps brachiiMedian nerveMuscles of the Anterior Compartment of the Forearm* Deep layer: Flexor pollicis longus, flexor digitorum profundus (median nerve and ulnar nerve), * pronator quadratus* Middle layer: Flexor digitorum superficialis* Superficial layer: Pronator teres, flexor carpi radialis, flexor carpi ulnaris (ulnar nerve), * palmaris longusRadial nerveMuscles of the Posterior Compartment of the Arm* Anconeus* TricepsRadial nerveMuscles of the Posterior Compartmentof the Forearm* Deep layer: Supinator, extensor pollicis longus, abductor pollicis longus, extensor indicis and extensor pollicis brevis* Superficial layer: Extensor carpi radialis longus, brachioradialis, extensor carpi ulnaris, extensor carpi radialis brevis, extensor digiti minimi and extensor digitorum communisMedian nerveThenar Muscles* Opponens pollicis* Abductor pollicis brevis* Flexor pollicis brevis (median and ulnar nerves)*Ulnar nerveHypothenar Muscles* Opponens digiti minimi* Abductor digiti minimi* Flexor digiti minimiUlnar nerveAdductor Pollicis Muscle Ulnar nerveInterossei (Dorsal and Palmar) Muscles Median nerveLateral Two (1st and 2nd)Lumbrical Muscles (4)Ulnar nerveMedial Two (3rd and 4th)
Loss of sensation of tip of index finger dorsal side
Loss of sensation over hypothenar muscles
Loss of sensation at the tip of radial bone
Loss of sensation from 4th Interdigital cleft
Upper Extremity