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Thenar space

Authoring team

The thenar space is one of the three deep palmar spaces. It is rarely the site of hand infections. The fibrofatty space contains the first lumbrical muscle.

Relations:

  • ulnarly: midpalmar septum from border of palmar aponeurosis to palmar border of third metacarpal bone
  • radially: fascia of adductor pollicis longus muscle
  • dorsally: adductor pollicis
  • volarly: flexor tendons of index finger
  • distally: margin of synovial sheath of index finger
  • proximally: distal margin of carpal tunnel

The thenar eminence demarcates the thenar space on the palmar surface.

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