Forearm/Hand nerves/vessels

Question 1

the ulnar nerve lies _____ to the ulnar artery in the forearm

Answer 1

Medial

Question 2

the ulnar artery supplies which nerves

Answer 2

the ulnar and median nerves

Question 3

This artery passes posteriorly through the cubital fossa, deep to the superficial and intermediate flexors to medial side of forearm. It passes superficial to the flexor retinaculur through Guyon canal to enter the hand

Answer 3

Ulnar artery

Question 4

Branch of the ulnar nerve in the cubital fossa that divides into anterior and posterior arteries or the same name

Answer 4

Common interosseus arteries

Question 5

this artery runs along the anterior aspect of the interosseus membrane before piercing it near the proximal boarder of pronator quadratus.

Answer 5

Anterior interosseus artery

Question 6

this small artery runs between the superficial and deep layers of extensor muscles serving the structures in the middle third of the posterior compartment

Answer 6

Posterior interosseus artery

Question 7

Which artery is just lateral to FCU tendon at the wrist

Answer 7

ulnar artery

Question 8

which artery runs distally under brachioradialis

Answer 8

radial artery

Question 9

The Course of the radial artery at the wrist…?

Answer 9

runs anteriorly on the radial bone before coursing around the lateral aspect of the wrist to run in the floor of the anatomical snuff box.

Question 10

Which arteries make up the lateral elbow arterial anastomoses

Answer 10

Radial recurrent artery from radial artery anastomoses with the radial collateral artery from the deep artery of the arm.

Question 11

The palmar and dorsal carpal arches are anastomoses of which arteries?

Answer 11

radial artery (both) , ulnar artery (both), anterior interosseus artery (dorsal)

Question 12

the anteriolateral muscles of both the flexor and extensor compartments are supplied by which artery

Answer 12

Radial

Question 13

The anterior interosseus nerve is a branch of which nerve.

Answer 13

median

Question 14

Enters cubital fossa medial to brachial artery, exits by passing between heads of pronator teres, runs in neurovascular plane between intermediate and deep flexors. Runs deep to PL tendon before entering carpal tunnel

Answer 14

Median n. C6,C7,C8,T1

Question 15

this nerve runs deep to pronator quadratus after passing between FDP and FPL

Answer 15

anterior interosseus n

Question 16

the skin of the central palm is supplied by

Answer 16

Palmar cutaneous branch of median n

Question 17

Passes between heads of FCU to enter forearm. Descends in forearm between FCU and FDP. becomes superficial in distal forearm

Answer 17

ulnar n

Question 18

branch of ulnar n that supplies skin of hand

Answer 18

Dorsal cutaneous branch of ulnar n

Question 19

Enters cubital fossa between brachioradialis and brachialis, anterior to lateral epicondyle - divides into terminal, superficial and deep branches

Answer 19

Radial n

Question 20

originates from radial nerve as it traverses the radial groove at posterior humerus. Perforates lateral head of triceps, decends along lateral side of arm and posterior forearm to wrist

Answer 20

Posterior cutaneous n of forearm

Question 21

From radial n at cubital fossa, descends between pronator teres and brachioradialis. Emerges from brachioradialis to “arborize” over anatomical snuff box to supply skin of dorsum of lateral aspect of hand

Answer 21

Superficial branch of radial n

Question 22

from radial n in cubital fossa. exits fossa winding around radial neck, penetrating and supplying supinator, emerges in posterior compartment of forearm and takes another name from the artery that it runs with in the posterior compartment

Answer 22

Deep branch of radial nerve becoming posterior interosseous nerve as it decends on the membrane with the posterior interosseus artery.

Question 23

Continuation of musculocutaneous nerve distal to its muscular branches. It emerges lateral to biceps brachii, on brachialis, running initially with the cephalic vein. It decends along the lateral boarder of the forearm to the wrist.

Answer 23

Lateral cutaneous n of forearm

Question 24

From the medial cord of the brachial plexus, C8, T1. Perforates deep fascial of arm with the basilic vein proximal to the cubital fossa. Descends medial aspect of forearm

Answer 24

medial cutaneous n of forearm

Question 25

ulnar artery enters the hand through….

Answer 25

the Guyon Canal

Question 26

The terminal branches of the ulnar artery are

Answer 26

the superfical and deep palmar braches

Question 27

The radial artery enters the palm by passing between the heads of which muslces?

Answer 27

1st dorsal interossei and then adductor pollicis

Question 28

The radial artery terminates by anastomosing with which artery to form what?

Answer 28

Joins deep branch of ulnar artery to form deep palmar arch

Question 29

Distal to the carpal tunnel, the medain nerve supplies….

Answer 29

1st and 2nd lumbricals and 2.5 thenar muscles.
Skin over the median distribution pattern.
***be aware that there is a palmar cutaneous branch of the median n that supplies the central palm also - this branch comes off before and passes anterior to the carpal tunnel.

Question 30

Explain how injury to the median nerve in the carpal tunnel can result in sparing of sensation of the central palm.

Answer 30

A proximal branch of the median n, the palmar cutaneous branch passes exterior to the carpal tunnel and also supplies the skin of the central palm.

Question 31

which thenar muscles does the median nerve supply?

Answer 31

Oponins pollicus, Abductor pollicus brevis and the superficial head of flexor pollicus brevis (via the recurrent thenar branch)

Question 32

Which thenar muscles does the ulnar nerve supply?

Answer 32

Adductor pollicus and the deep head of Flexor Pollicis brevis

Question 33

The ulnar emerges from under which tendon before passing into the hand

Answer 33

FCU

Question 34

What muscles does the ulnar n supply in the hand

Answer 34

The majority!

• hypothenar muscles
• deep head of FPB, adductor PB
• medial 2 lumbricals
• palmar and dorsal interossei

Question 35

Branches of ulnar n

Answer 35

• palmar cutaneous branch (middle of forearm) (s)
• Dorsal branch (5cm prox to wrist) (s)
• superficial branch (in hand) (s)
• deep branch (in hand) (m)

Question 36

The n supply of the hand provided by the radial n ….

Answer 36

No motor.

Superficial branch arising from radial n in cubital fossa - supplies the radial sensory distribution in the hand

Question 37

which nerve can be injured easily in the thenar eminence because it runs superficially here.

Answer 37

Recurrent thenar branch of median n

Question 38

What sort of injury causes damage to recurrent thenar branch of median n and what happens clinically.

Answer 38

Superficial injury to thenar eminence - this nerve constitutes the median n supply to the thenar muslces - superficial head of FPB, ABductor PB and oponens pollicis