ANAT 5010 - unit 7

ulnar bursa

synovial sheath for 8 flexor digitorum tendons

radial bursa

synovial sheath for flexor pollicis longus tendon

- flexor digitorum superficialis tendons

- flexor digitorum profundus tendons

- flexor pollicis longus tendon

- median nerve

what travels through the carpal tunnel?

- abductor pollicis brevis

- flexor pollicis brevis

- opponens pollicis

- tendon of flexor pollicis longus

what muscles are in the thenar compartment?

recurrent branch of the median nerve

what nerve innervates the thenar compartment?

- all originate from the lateral side of the flexor retinaculum

insertions:

- abductor pollicis brevis - lateral side of base of proximal phalanx

- flexor pollicis brevis - lateral side of base of proximal phalanx

- opponens pollicis - shaft of first metacarpal

what are the origins and insertions of the muscles in the thenar compartment?

- abductor digiti minimi

- flexor digiti minimi brevis

- opponens digiti minimi

what muscles are in the hypothenar compartment?

deep branch of ulnar nerve

what innervates the hypothenar compartment?

origin: medial end of flexor retinaculum

insertions:

- abductor digiti minimi - medial side of base of proximal phalanx

- flexor digiti minimi brevis - medial side of base of proximal phalanx

- opponens digiti minimi - medial side of fifth metacarpal

what are the origins and insertions of the muscles in the hypothenar compartment?

palmar aponeurosis

what is the insertion of the palmaris longus that has longitudinal and transverse fibers?

- tendons from the flexor digitorum superficialis

- tendons from the flexor digitorum profundus

- lumbricals

what muscles are in the central compartment?

median nerve for first two lumbricals

deep branch of ulnar nerve for second two lumbricals

what innervates the lumbricals?

in the central compartment of the hand

where is the superficial palmar arch?

origin: tendons of flexor digitorum profundus

insertion: dorsal hood

what is the origin and insertion of the lumbricals?

flex the MCP's and extend the IP's

what is the action of the lumbricals?

- interosseous muscles (4 DABs and 3 PADs)

- adductor pollicis (oblique and transverse head)

what muscles are in the adductor interosseous compartment?

adductor interosseous compartment

where is the deep palmar arch located?

origin: oblique head - capitate, transverse head - 3rd metacarpal

insertion: medial side of proximal phalanx

what is the origin and insertion of the adductor pollicis

as it passes through the two heads of the adductor pollicis

when does the radial artery become the deep palmar arch?

princeps pollicis

branch of radial artery that supplies the thumb

radialis indicis

branch of radial artery that supplies the lateral side of the second phalanx

- thenar compartment muscles

- first two lumbricals

what does the median nerve supply motor innervation to in the anterior hand?

- lateral 3.5 digits

- anterior forearm above wrist (from palmar branch that doesn't go through carpal tunnel)

what does the median nerve supply sensory innervation to in the anterior hand?

- hypothenar muscles

- 3rd and 4th lumbricals

- interosseous muscles

- adductor pollicis

what does the ulnar nerve supply motor innervation to in the anterior hand?

skin of medial 1.5 digits

what does the ulnar nerve supply sensory innervation to in the anterior hand?

C6

dermatome of the thenar compartment

C7

dermatome of the 2nd and 3rd digits

C8

dermatome of the 4th and 5th digits