Anatomy - Hand

Question 1

Hand

Answer 1

27 Bones

Question 2

Bones

Answer 2

8 Carpal bones
Proximal: Scaphoid, Lunate, Triquetral, Hamate
Distal: Trapezium, Trapezoid, Capitate, Hamate

5 Metacarpals
(thumb, index, middle, ring, little)

14 Phalanx
(proximal, middle, distal)
*except thumb, do not have middle

Question 3

Structures in the wrist

Answer 3

1. Above flexor retinaculum
2. Beneath flexor retinaculum
3. Above extensor retinaculum
4. Beneath flexor retinaculum

Question 4

Structures above flexor retinaculum (medial to lateral)

Answer 4

1. FCU
2. Ulnar nerve
3. Ulnar artery
4. Cutaneous branch of ulnar
5. Palmaris longus
6. Cutaneous branch of median

• 2 tendon
• 3 nerve
• 1 artery

Question 5

Structures beneath flexor retinaculum (medial to lateral)

Answer 5

1. FDS, FDP
2. Median nerve
3. FPL
4. FCR

• 4 tendon
• 1 nerve

Question 6

Structures above extensor retinaculum (medial to lateral)

Answer 6

1. Cutaneous branch of ulnar
2. Basilic vein
3. Cephalic vein
4. Superficial branch of radial nerve

• 2 nerve
• 2 veins

Question 7

Structures below extensor retinaculum (medial to lateral)

“Extensor compartment of the wrist”

Answer 7

1. ECU (6th compartment)
2. EDM(5th compartment)
3. ED, EI (4th compartment)
4. EPL (3rd compartment)
5. ECRL, ECRB (2nd compartment)
6. Radial artery
7. EPB, APL (1st compartment)

• 9 tendons
• 1 artery

Question 8

5 Zones of the hand

Answer 8

I - Distal to FDS
II - Opening of flexor sheath (distal palmar crease) to I
III - End of carpal tunnel to II
IV - Beginning of carpal tunnel
V - Proximal to carpal tunnel