This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral nerve injuries, Subject name: Orthopaedics
what happens in Klumpkes paralysis 
Select and explain. 
A. Water tip deformity, B. Intrinsic hand muscle weakness, C. Elbow extended and wrist extended, D. Only elbow is extended
B: Intrinsic hand muscle weakness
Answer: B: Intrinsic hand muscle weakness 
Explanation: Klumpke&;s paralysis * site of injury - lower trunk of brachial plexus ( C8,T1) * cause of injury - undue abduction of the arm, as in clutching something with the hand after a fall from height , sometimes in bih injury . *Muscles paralysed- *intrinsic muscle of hand (T1), ulnar flexors of wrist & fingers (C8) *deformity - claw hand due to unopposed action of long flexors & extensors of the fingers . In claw hand there is hyperextension at metacarpophalageal joint & flexion at the interphalangeal joints. REF:textbook of ohopedics, John Ebenezer, 4th edition ,pg.no.351