Editing Upper limb (section)

== '''Carpal tunnel''' ==

* Fibro-osseous tunnel at the     wrist
* '''Boundaries'''
** Superficially/roof - flexor      retinaculum - runs between medial and lateral structures. Thick      connective tissue.
** Deep/floor - deep carpal      arch - concave surface
** Laterally - scaphoid and      trapezium tubercles
** Medially - hook of hamate      and pisiform
* '''Contents:''' (nine tendons and the median     nerve)
** FPL
** Four tendons of FDP
** Four tendons of FDS
** Median nerve
*** At the level of wrist, has       three main branches. Palmar cutaneous - take-off proximal to carpal       tunnel, supplies skin over thenar eminence. Sensory branch through       carpal tunnel. (Recurrent) motor branch which sometimes goes through       carpal tunnel (see 'median nerve' below).
* '''Structures     that pass superficial to the flexor retinaculum'''
** Ulnar artery and nerve (in      small canal of Guyon)
** Palmaris longus tendon
** Palmar cutaneous branch of      median nerve
** Flexor carpi radialis      (retinaculum divides laterally to create a separate compartment)
** Superficial palmar arch is      more distal to the flexor retinaculum, but superficial