Anatomy

Question 1

Name the 6 dorsal tunnels and the tendons.

Answer 1

1 - AbPL, EPL
2 - ECRL and ECRB
3 - EPL
4 - EDC, Ext indicis 
5 - extensor digiti minimi 
6 - ECU

Question 2

What passes through the carpal tunnel?

Answer 2

FDS, FDP, FPL and median nerve

Question 3

What goes through Guyon’s canal?

Answer 3

Ulnar artery and nerve. The FCU is just outside

Question 4

Digital nerves and arteries

Answer 4

Nerve is more superficial so if the artery is lacerated so is the nerve.

Question 5

Flexor sheath of a finger

Answer 5

A1, A3, A5 are at the joints proximal to distal. A2 and A4 are considered the most crucial

Question 6

Zones of flexor and extensor tendon injuries

Answer 6

Flexor - 5 zones
Extensor - 8 zones

Zones go from distal (1) to proximal.

Question 7

What is the space of Poirier?

Answer 7

The triangular shaped Fe T the base of the V formed by the ulnocapitate and radio amputate ligaments on the palmar aspect. The area is weak leading to perilunate dislocations

Question 8

Normal ROM of the wrist

Answer 8

Flex - 80, 60% from mid carpal 
Ext - 70, 66% from radio carpal
RD - 20
UD - 30
   60% from mid carpal (radial/ulnar deviation arc)
Pro & Sup - 80, 160 total motion

Question 9

APB

Answer 9

RBMN
O - flexor retinaculum, scaphoid and trapezium
I - lateral base of promixmal phalanx

Question 10

FPB

Answer 10

Superficial - RBMN; deep - deep ulnar n
O - superficial head: flexor retinaculum, trapezium
Deep head: capitate, trapezium
I - lateral base of proximal phalanx

Question 11

OP

Answer 11

RBMN
O - flexor retinaculum, trapezium
I - lateral/anterior shaft of 1st MC

Question 12

AP

Answer 12

Deep Ulnar
O - oblique head: capitate, trapezoid, base of 2nd MC
Transverse head: shaft of 3rd MC

Question 13

ADM

Answer 13

Deep ulnar
O - pisiform
I - medial base of 5th proximal phalanx

Question 14

FDM

Answer 14

Deep ulnar
O - hook of hammate
I - medial pass of 5th proximal phalanx

Question 15

ODM

Answer 15

Deep ulnar
O - hook of hammate
I - anterior shaft of 5th MC

Question 16

PB

Answer 16

Superficial Ulnar
O - medial palmar aponeurosis
I - skin

Deeps palm

Question 17

Lumbricals

Answer 17

1&2 - median
2&4 -ulnar

Flexion of MCPs and extension of DIP and PIP

Question 18

Dorsal Interossei

Answer 18

Deep Ulnar
O - double heads from adjacent MCs
I - extensor expansions of fingers 2-4 on side

Spreads fingers

Question 19

What muscles of the hand are innervated by the RBMN?

Answer 19

APB
Superficial FPB
OP

Question 20

What muscles of the hand are innervated by the deep ulnar nerve?

Answer 20

Deep FPB
AB
ABDminimi
FDminimi
ODminimi
Dorsal Interossei 
Palmar Interossei

Question 21

What does the anterior interosseous nerve innervate?

Answer 21

FPL
Pronator quadratus
FDP