MSK 4 - Palm of the hand

Question 1

What is the palmar aponeurosis and what does it do?

Answer 1

• trianglular connective tissue
• prevents skin from slipping off hand
• seperates thenar and hypothenar eminence

Question 2

The superficial palmar arch is a branch of what artery?

Answer 2

ULNAR ARTERY

Question 3

The deep palmar arch is a branch of what artery?

Answer 3

RADIAL ARTERY

Question 4

What is found deep to the palmar aponeurosis?

Answer 4

superficial palmar arch

Question 5

What is carpal tunnel syndrome?

Answer 5

swelling of the tendons passing through the tunnel

• presses on median nerve
• leads to weakness in hand

Question 6

Why are the flexor tendons extrinsic muscles?

Answer 6

• originate elsewhere

- have action distal to the wrist

Question 7

Name 3 flexor tendons

Answer 7

1. flexor digitiorum superficialis
2. flexor digitorum profundus
3. flexor pollicis longus

Question 8

Explain how FDS and FDP attach to the digits

Answer 8

• supeficialis splits in two- attaching to each side of middle phalanx
• profundus attaches to distal phalanx passing in between gap of FDS

Question 9

What holds FDS and FDP onto the finger?

Answer 9

fibrous flexor and synovial sheath

Question 10

What muscles does the thenar eminence contain? What do these allow?

Answer 10

• opponens pollicis
• abductor pollicis brevis
• flexor pollicis brevis

important in producing a precision grip

Question 11

What is the largest and deepest muscle of the thenar eminence?

Answer 11

opponens pollicis

Question 12

What muscles are found in the hypothenar eminence?

Answer 12

• opponens digiti minimi
• abductor digiti minimi
• flexor digiti minimi

Question 13

Nerve supply of the thenar and hypothenar eminence

Answer 13

thenar - median nerve

hypothenar - ulnar nerve

Question 14

The lumbricalis muscles are extensions of..

Answer 14

flexor digitorum profundus

Question 15

What do the lumbricalis muscles do?

Answer 15

flex MCPJ and INPJ

Question 16

Do the lumbricalis muscles pass lateral or distal to the proximal phalanx?

Answer 16

LUMBRICALIS - LATERAL!!!

Question 17

Nerve supply of the lumbricals

Answer 17

• lateral 2 - median nerve
• medial 2 - ulnar nerve

SAME AS FDP

Question 18

How many dorsal and palmar interrosseis? What do they do?

Answer 18

3 to me, 4 to the floor - PAD/DAB

• palmar = 3 - adduct fingers
• dorsal = 4 - abduct fingers

Question 19

Nerve supply of the interrosseis

Answer 19

ulnar nerve

Question 20

Nerve supply of the hand

Answer 20

MEDIAN AND ULNAR SUPPLY ALL THE INTRINSIC MUSCLES OF THE HAND

Question 21

Median and ulnar nerve supply

Answer 21

MEDIAN - LLOAF

• 2 lateral lumbricals
• thenar eminence (OAF)

ULNAR = EVERYTHING ELSE

Question 22

Where is the adductor pollicis found? What does it do?

7 shape - 2 heads

Answer 22

dorsal view of the hand - ADDUCTS THUMB

Question 23

What are the bones of the wrist?

Answer 23

• scaphoid
• lunate
• triquetrium
• pisiform
• trapezioid
• trapezium
• capatate
• hamate

Question 24

Which nerve is affected in carpal tunnel syndrome? Which nerve is spared and why?

Answer 24

• ONLY MEDIAN NERVE AFFECTED

- ulnar nerve and artery pass over tunnel thus spared

Question 25

What forms the roof of the carpal tunnel, keeping the tendons in place?

Answer 25

flexor retinaculum

Question 26

Which bones of the wrist articulate with the the radius?

Answer 26

scaphoid and lunate