nerves to the arm & forearm-->they are the median , the ulnar , the radial , the musculocutaneous nerves

effects of their injury are :

the median nerve --> causes ape hand deformity

the ulnar nerve --> causes claw hand

the radial nerve --> causes wrist , finger drop

the musculocutaneous nerve --> causes paralysis in coracobrachialis, brachialis & biceps along with sensory nerve in lateral part of forearm( by affecting lateral cutaneuos nerve of forearm )

all of these nerves and more are branches of the cords of brachial plexus --> which are formed of anterior rami of C5,C6,C7,C8,T1 nerves , which are considered the roots of the brachial plexus

the injury of brachial plexus ( level of c5,c6,c7) causes erb's palsy --> also called porter tip's paralysis

and injury at level of ( c8,T1 ) is known as klumpke's palsy

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