Functional Anatomy Of the Hand

Question 1

Which nerve provides sensation to the radial portion of the dorsum to the hand?

1. Radial Nerve
2. Median Nerve
3. Ulnar Nerve

Answer 1

Radial Nerve

Question 2

Which 2 arteries supply blood to the hand and digits?

Answer 2

Radial and ulnar arteries

Question 3

Hypothenar eminence refers to the fleshy muscular area on the

1. Lateral side of the thumb
2. Medial side of the 5th digit

Answer 3

Medial side of the 5th digit. Both eminences contain intrinsic muscles

Question 4

________indicates the location of the metacarpophalangeal joint of the thumb

1. Proximal digital crease
2. Distal digital crease

Answer 4

Proximal Digital Crease

Question 5

Which digital crease of the finger corresponds to the middle knuckle of each finger?

1. Proximal digital crease
2. Proximal interphalangeal crease
3. Distal interphalangeal crease

Answer 5

Proximal interphalangeal crease

Question 6

Flexor digitorum profundus and superficialis are associated with

1. Intrinsic muscles of the Palm
2. Extrinsic muscles of the Palm

Answer 6

Extrinsic muscles of the Palm. At the base of the metacarpophalangeal joint for each finger, a tubular shaped digital synovial sheath surrounds the combined superficialis and profundus tendons to each finger. The sheath continues to the base of the distal phalanx

Question 7

Which two nerves supply all of the intrinsic muscles of the hand?

Answer 7

The ulnar and Median Nerves

Question 8

The tendon of the ______ is surrounded by its own synovial digital sheath

1. Flexor digitorum longus
2. Flexor digitorum brevis
3. Flexor pollicis longus

Answer 8

Flexor pollicis longus

Question 9

Within the synovial digital sheath, long and short______help convey blood vessels to the tendon.

1. Muscle fibers
2. Vincula

Answer 9

Vincula

Question 10

What is the extensor digitorum innervated by?

Answer 10

1. Anterior Interosseous Branch of the radial nerve

2. Posterior Interosseous Branch of the radial nerve

Question 11

Which intrinsic muscles of the hand act primarily on the metacarpophalngeal joints of the fingers?

1. Thenar muscles
2. Hypothenar muscles
3. Interossei
4. Lumbricals

Answer 11

Interossei

Question 12

The Opponens Pollicis requires help from which two other muscles to carry out opposition of the thumb?

Answer 12

Flexor pollicis brevis and abductor pollicis brevis

Question 13

The adductor pollicis is innervated by what nerve?

1. Radial
2. Ulnar

Answer 13

Ulnar

Question 14

The flexor retinaculum, the pisiform bone, and the hamate bone is the site of attachment for which set of muscles?

1. Thenar muscles
2. Hypothenar muscles

Answer 14

Hypothenar. It includes the abductor digiti minimi, the flexor digiti minimi, and the opponens digiti minimi. They are all innervated by the deep brach of the ulnar nerve.

Question 15

The lumbricals arise from:

1. Flexor digitorum profundus
2. Flexor digitorum superficialis

Answer 15

Flexor digitorum profundus. They are innervated by the median (1&2) and ulnar nerves (3&4).

Question 16

The 3 palmer interossei are associated with which digits?

Answer 16

2, 4, and 5 and . They are flexors of the metacarpophalangeal joints and and adductors . All the interossei muscles are innervated by the deep branch of the ulnar nerve.

Question 17

The extensor hood moves______to the metacarpophalangeal when this joint is flexed by the extrinsic finger flexors.

1. Proximal
2. Distal

Answer 17

Distal

Question 18

Which nerve is responsible for providing sensory innervation form the palmer surface of the first 3.5 digits. This region also corresponds to the C6 dermatome. It also provides motor information to the thenar muscles and the first 2 lumbricals.

1. Radial
2. Median
3. Ulnar

Answer 18

Median

Question 19

The deep palmer arch supplies ________muscles of the hand.

1. Intrinsic
2. Extrinsic

Answer 19

Intrinsic

Question 20

The lumbricals can flex metacarpophalangeal joints only when the they also ……..

Answer 20

Extend the interphalangeal joints of the fingers. The interossei are the main muscles for flexion of the metacarpophalngeal joints of the fingers.