Dissection 13 Flashcards Preview

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Flashcards in Dissection 13 Deck (31):
1

What is the flexor retinaculum a thickening of?

the antebrachial fascia of the anterior forearm

2

What does the flexor retinaculum attach to laterally?

scaphoid/trapezoid

3

What does the flexor retinaculum attach to medially?

pisiform and hamate

4

The distal tendon of which muscle fuses with and stregthens the flexor retinaculum?

palmaris longus

5

What is the carpal tunnel?

a combination of the carpal bones posteriorly and the flexor retinaculum anteriorly

6

what is contained within the carpal tunnel?

long tendons of the forearm flexor muscles (FDS, FDP; FPL) and the median nerve

7

What is carpal tunnel syndrome?

when the median nerve is compressed

8

Why is sensation of the central palm unaffected in carpal tunnel syndrome?

the palmar cutaneous branch of the median nerve is given off proximal to the tunnel

9

What forms the superficial palmar arch?

the superficial palmar branch of the ulnar artery along with the superficial palmar branch of the raidal artery

10

Where is the superficial palmar arch found?

immediately deep to the palmar aponeurosis

11

Where does the deep palmar arch run?

across the anterior aspects of the bases of the metacarpals

12

What forms the deep palmar arch?

the deep branches of the ulnar and radial arteries

13

What is dupuytrens contracture?

when there is thickening and shortening of the palmar fascia causing a FFD of mainly the ring and little fingers

14

What are the neurovascular bundles supplying each finer?

medial and lateral palmar; medial and lateral dorsal

15

What sensory innervation of the hand does the ulnar nerve give?

medial part of palm; little finger; medial half of the ring finger

16

What sensory innervation does the median nerve give to the hand?

central/lateral palm; medial half of the ring finger; middle and index finger; thumb (excluding skin over base)

17

What sensory innervation of the hand does the radial nerve supply?

skin over the base of the thumb

18

What are the fibrous digital sheaths a continuation of?

the longitudinal digital bands of the palmar aponeurosis

19

What do the fibrous digital sheaths attach to?

both sides of the phalanges

20

What is the purpose of the fibrous digital sheaths?

they form a secure tunnel through which the FDS, FDP and FPL tendons and their synovial sheaths travel distally

21

What does tenderness in the floor of the anatomical snuff box folowing trauma suggest?

a scaphoid fracture

22

What sensory innervation on the dorsum of the hand does the ulnar nerve give?

medial part of dorsum of the hand; little finger and medial half of ring finger

23

What sensory innervation does the median nerve give on the dorsum of the hnad

skin over distal phalanges/nail beds of thumb, index finger and middle finger

24

What does the radial nerve supply on the dorsum of the hand?

skin over the anatomical snuffbox; lateral part of dorsum of hand; proximal index and middle fingers

25

What do the lumricals attach between?

the FDP tendon adn the extensor explansion of the same digit

26

What do the the lumbricals span?

the anterior aspect of the 2nd to 5th MCP joints and the posterior aspect of hte 2-5th PIP joints

27

What is the action of the lumbricals?

to flex the MCP and extend the PIP joitns

28

What is the nervous supply to the lumbricals?

medial 2- ulnar nerve
lateral 2- median nerve

29

What is the function of the palmar interossei?

adduct the digits (PAD)

30

What is the function of the dorsal interossei?

abduct (DAB)

31

What nerve supplies the interossei?

ulnar nerve