Muscles in thenar cpmpartment

Question 1

What is the innervation of all thenar muscles?

Answer 1

motor recurrent branch of radial nerve (million dollar nerve)

Question 2

How does the radial artery course in the thenar compartment?

Answer 2

dives deep to the 1st dorsal interosseus and divides into the princeps pollicis and deep palmar arterial arch
the radial side receive of the index finger a separate branch called the radialis indices from princeps pollicis artery

Question 3

What are the muscles of the thenar compartment?

Answer 3

abductor pollicis brevis
flexor pollicis brevis
opponens pollicis

Question 4

What is the attachment and action of abductor pollicis brevis?

Answer 4

terminates at base of proximal phalanx

assist the long abductor in abduction of the the thumb

Question 5

What is the attachment and action of flexor pollicis brevis?

Answer 5

terminates at the base of proximal phalanx

assist long flexor in flexion of thumb

Question 6

What are the attachments and action of opponen pollicis muscles?

Answer 6

inserts into shaft of first metacarpal

creates slight rotation to create opposition (ability for the pads and thumb to meet)

Question 7

What happens when the median nerve is damaged?

Answer 7

opposition is impossible because opponnes pollicis does not have a back up