Opponens polisis

Original Editor -Nikhil Benhur Abburi

Top Contributors - Nikhil Benhur Abburi

Description

Opponens pollicis is a muscle of thenar eminence, it is triangular in shape and lies deep to flexor pollicis brevis and abductor pollicis brevis

Origin

Originates from the flexor retinaculum, tubercles of scaphoid and trapezium, abductor pollicis longus tendon.

1024px-1121 Intrinsic Muscles of the Hand Deep LD.png

[1]

1024px-1121 Intrinsic Muscles of the Hand Superficial sin.png

[2]

Insertion

Radial side of the base of proximal phalanx of thumb

Nervepalmar

It is supplied by the median nerve (C8, T1)

Artery

It receives blood supply from superficial arch

Function

Rotates thumb into opposition with fingers

Assessment

it is tested with the forearm in supination, wrist in neutral, thumb in adduction with MP and IP joints in flexion and instruct the patient to bring his/her thumb to the little finger and touch the two pads, forming the letter 'O' with thumb and little finger

Resources

  1. By CFCF - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=44236045
  2. By CFCF - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=44236044