Anatom3DCarpal tunnel
Canalis carpi · Karpální tunel
Fascia & connective tissue
Looks like
A narrow passage on the palm side of the wrist, floored by the wrist bones and roofed by a tight band of ligament.
What it does
Lets the median nerve and nine flexor tendons pass from the forearm into the hand.
Keeping it well
Swelling here squeezes the nerve: tingling in the thumb and first fingers, worse at night. Night splints help; weakness or a wasted thumb base needs surgery.