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)