Hand

Question 1

What sort of joint are the intercarpal and carpometacarpal joints?

Answer 1

Plane joints allowing sliding/translation movements.

Question 2

What sort of joints are the trapeziometacarpal joint?

Answer 2

Specialized CMC joint acting as a saddle.
This is the thumb joint.
Allows flexion/extension, abduction/adduction, opposition.

Question 3

What type of joint is the metacarpophalangeal joint?

Answer 3

Condyloid allowing flexion/extension

Abduction and adduction.

Question 4

What sort of joint are the interphalangeal joints?

Answer 4

These are hinge joints working to flex and extend.

Question 5

What bone is most commonly broken in the hand when falling with your palms outstretched?

Answer 5

The Scaphoid, the inferior aspect can lost its blood supply.

Question 6

What occurs in a Jersey finger injury?

Answer 6

Rupture/ avulsion of the FDP tendon from base of distal phalanx.
Leads to inability to flex at DIP joint of affected digit.

Question 7

What occurs in a mallet finger injury?

Answer 7

Sudden impact forces distal phalanx into hyperflexion due to an avulsion of the extensor expansion.
Leads to inability to extend DIP joint of affected digit.

Question 8

What nerve innervates the thenar eminance?

Answer 8

The superficial branch of the median nerve.

Question 9

What nerve innervates the hypothenar compartment?

Answer 9

The Deep branch of the ulnar nerve.

Question 10

What nerves innervate the then flexor pollicis brevis?

Answer 10

The flexor pollicus brevis has two heads. The superficial head is innervated by the recurrent branch of the median nerve. The deep head of the muscle is innervated by the deep branch of the ulnar nerve.

Question 11

What nerve innervates the muscles of the hypothenar group?

Answer 11

These muscle are innervated by the deep ulnar nerve.

Question 12

What is the function of the lumbricles?

Answer 12

These 4 extend at the IP joints and flex at the MCP joints

Question 13

What is the innervation to the lumbricles?

Answer 13

The lateral 2 are innervated by the median nerve
The medial 2 are innervated by the deep ulnar
**Same innervation pattern as what the flexor digitorum profundus has.

Question 14

What nerve innervates both the palmar and dorsal interossei?

What nerve innervates the adductor policus?

Answer 14

The deep ulnar nerve!

Question 15

Describe the blood supply to the digits of the hand and metacarpal bones.

Answer 15

The superficial palmar arch gives rise to three common digital arteries. These will then give rise to 6-7 proper digital arteries.

The pinky gets a proper palmar digital artery to its self (No common)

Question 16

Describe the blood supply to the thumb.

Answer 16

Superficial radial artery links up with the ulnar through the abductor pollicus brevis to form the superficial palmar arch.
The radial artery wraps to the posterior forming the princeps pollicus artery that will give rise to the radialis indicus and the digital artery of the thumb.

The princeps pollicus also contoninues to form the deep arch.

Question 17

What cutaneous innervation does the ulnar nerve provide?

Answer 17

Provides innervation to medial palm and lateral 1.5 digits both anteriorly and posteriorly.

Question 18

What cutaneous innervation is provided by the median nerve to the hand?

Answer 18

The median nerve supplies the lateral 3.5 digits anteriorly as well as there nail beds.

Question 19

What cutaneous innervation is provided by the radial nerve?

Answer 19

The dorsal aspect of the lateral 3 digits not including the nail beds.

Question 20

What is guyons canal?

Answer 20

Narrow space between the pisiform and hamate through which the ulnar nerve passes and can be compressed.

Question 21

What is a type I Guyons canal compression?

Answer 21

Ulnar nerve trunk compressed proximally leading to loss of motor and cutaneous

Question 22

What is a type II Guyons canal compression?

Answer 22

Deep branch of ulnar nerve compressed leading to loss of motor

Question 23

What is a type III guyons canal compression?

Answer 23

Compression of the cutaneous ulnar nerve having sensory loss only.

Question 24

What are the muscle innervated by the median nerve?

Answer 24

LOAF
1/2 lumbricles
Opponens pollicus
Abductor pollicus brevis
Flexor pollicus brevis

Question 25

What are the contents of the carpal tunnel?

Answer 25

9 tendons
FDP
FDS
FPL

Question 26

What causes Ape hand?

Answer 26

Prolonged carpal tunnell leading to loss of the thenar muscles
Thumb will be adducted and externally rotate.

Question 27

What would loss to the recurrent branch of the ulnar nerve lead to?

Answer 27

Ape hand!

Supplies the thenar muscles only.