Passes anterior to flexor retinaculum and divides into superficial and deep branches
Superficial: supplies palmaris brevis and medial one and half fingers
Deep branch- this arches deep in the concavity of the deep palmar arch and gives motor braches to

• hypothenar muscles
• medial two lumbricals
• 8 interrossei
• deep head of flexor pollicis brevis
• heads of adductor hallucis

Ulnar nerve injury presents with

• Claw hand
• Loss of sensation medial one and half fingers
• Loss of finger abduction
• Loss of finger adduction
• Atrophy of hypothenar eminence and inter-metatarsal spaces

• Deep to flexor retinaculum
• Gives a recurrent branch to thenar muscles
• The nerve then gives a medial and a lateral branches
• The medial branch gives 2 common digital for 2nd and 3rd clefts and sides of ring middle and index fingers.
• The lateral supplies palmar skin, radial side of index and whole of the thumb on the palmar surface and distal dorsal surface.
  The branch to the index finger supplies the 1 st lumbrical

Medial nerve injury

• The hand position is described “papal hand”
• There is loss of sensation on the palmar medial three and half fingers to include their nail beds
• Loss of opposability with atrophy of thenar muscles.

• It is a continuation of superficial terminal branch
  
  
• At dorsum of hand it divides into 4-5 dorsal digital branches
  
  
• Supplies lateral three and half fingers on the dorsal side except the nail beds