Hand Muscles

Question 1

What are the attachments of the palmaris brevis

Answer 1

proximal: dermis hypothenar region
distal: palmar aponeurosis & flexor retinaculum

Question 2

what is the torque of the palmaris brevis

Answer 2

wrinkles skin on ulnar side
improves grip

Question 3

what innervates and supplies blood to the palmaris brevis

Answer 3

superficial branch ulnar
superficial palmar arch

Question 4

what are the attachments of the Oppens Pollicis

Answer 4

proximal: flexor retinaculum & tubercles of scaphoid & trapezium
distal: lateral side of 1st metacarpal

Question 5

what is the torque of the Oppens Pollicis

Answer 5

opposes thumb: pulls 1st metacarpal to center of palm & rotates thumb medially

Question 6

what is the innervation and blood supply to the Oppens Pollicis

Answer 6

recurrent (thenar) branch of Median Nerve (C8, T1) & superficial palmar branch of radial artery

Question 7

what are the attachments of the abductor pollicis brevis

Answer 7

proximal: flexor retinaculum & tubercles of scaphoid and trapezium
distal: lateral side of base and proximal phalanx of thumb

Question 8

what is the torque of the abductor pollicis brevis

Answer 8

thumb abductor & helps oppose it

Question 9

what is the innervation and blood supply to the abductor pollicis brevis

Answer 9

thenar branch of Median Nerve & superficial palmar branch of the radial artery

Question 10

what are the attachments of the flexor pollicis brevis

Answer 10

proximal: flexor retinaculum & tubercles of scaphoid and trapezium
distal: proximal side of base and proximal phalanx of thumb

Question 11

what is the torque of the flexor pollicis brevis

Answer 11

thumb flexor

Question 12

what is the innervation and blood supply to the flexor pollicis brevis

Answer 12

thenar branch of median nerve & superficial palmar branch of radial artery

Question 13

what are the 3 thenar muscles

Answer 13

abductor pollicis brevis
opponens pollicis
flexor pollicis brevis

Question 14

what are the 3 hypothenar muscles

Answer 14

abductor digiti minimi
flexor digiti minimi
opponens digiti minimi

Question 15

what are the attachments of the flexor digiti minimi brevis

Answer 15

proximal: hook of hamate & flexor retinaculum
distal: medial side of base of proximal phalanx of 5th digiti

Question 16

what is the torque of the flexor digiti minimi brevis

Answer 16

flexor proximal phalanx of 5th digiti

Question 17

what innervates and supplies blood to the flexor digiti minimi brevis

Answer 17

deep branch of ulnar nerve and ulnar artery

Question 18

what are the attachments of the abductor digiti minimi

Answer 18

proximal: pisiform
distal: medial side of base of proximal phalanx of digit 5

Question 19

what is the torque of the abductor digiti minimi

Answer 19

abductor of the 5th finger

Question 20

what innervates and supplies blood to the abductor digiti minimi

Answer 20

deep branch of ulnar nerve & ulnar artery

Question 21

what are the attachments of the opponens digiti minimi

Answer 21

proximal: hook of hamate & flexor retinaculum
distal: medial boarder of the 5th metacarpal

Question 22

what is the torque of the opponens digiti minimi

Answer 22

draws 5th metacarpal anteriorly & rotates it

Question 23

what innervates and supplies blood to the opponens digiti minimi

Answer 23

deep branch of ulnar nerve and ulnar artery

Question 24

what are the attachments of the adductor pollicis

Answer 24

medial: 3rd metacarpal & capitate
lateral: medial side of base and proximal phalanx of thumb

Question 25

what is the torque of the adductor pollicis

Answer 25

adductor on thumb when abducted oppose thub by 1st metacarpal adductor with medial rotator

Question 26

what is the innervation and blood supply to the adductor pollicis

Answer 26

deep branch of ulnar nerve & deep palmar arterial arch

Question 27

what are the attachments of the lumbricals

Answer 27

proximal: tendon of flecor digitorum profundus distal: extensor expansion (hood)

Question 28

what is the torque of the lumbricals

Answer 28

flexor on MCP joint & extensor on IP joint

Question 29

what are the innervations of the lumbricals

Answer 29

3rd & 4th deep branch of ulnar 1st & 2nd median nerve

Question 30

what provides blood supply to the lumbricals

Answer 30

superficial palmar arch common palmar digital arteries deep palmar arch dorsal digital artery

Question 31

what are the attachments of the dorsal interosseous muscles (DABs)

Answer 31

proximal: dorsal 1-4 - adjacent sides of two metacarpals distal: extensor hood & base f proximal phalange of digits 2-4

Question 32

what is the torque of the dorsal interosseous muscles (DABs)

Answer 32

abductor on digits from axial line assist lumbricals as flexor MCP joint & extensor

Question 33

what innervates and supplies blood to the dorsal interosseous muscles

Answer 33

deep branch of ulnar nerve & dorsal and palmar metacarpal artery

Question 34

what are the attachments of the palmar interosseous muscles (PADs)

Answer 34

proximal: palmar surfaces of 2nd, 4th and 5th metacarpals distal: extensor hood & base of proximal phalange of digits 2,4 & 5

Question 35

what is the torque of the palmar interosseous muscles (PADs)

Answer 35

adductor on digits assist lumbricals as flexor MCP joint & extensor IP joint

Question 36

what innervates and supplies blood to the palmar interosseous muscles

Answer 36

deep branch of ulnar nerve and palmar metacarpal arteries