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MSK > Dissection 13 > Flashcards

Dissection 13 Flashcards

1
Q

What is the flexor retinaculum a thickening of?

A

the antebrachial fascia of the anterior forearm

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2
Q

What does the flexor retinaculum attach to laterally?

A

scaphoid/trapezoid

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3
Q

What does the flexor retinaculum attach to medially?

A

pisiform and hamate

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4
Q

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

A

palmaris longus

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5
Q

What is the carpal tunnel?

A

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

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6
Q

what is contained within the carpal tunnel?

A

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

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7
Q

What is carpal tunnel syndrome?

A

when the median nerve is compressed

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8
Q

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

A

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

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9
Q

What forms the superficial palmar arch?

A

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

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10
Q

Where is the superficial palmar arch found?

A

immediately deep to the palmar aponeurosis

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11
Q

Where does the deep palmar arch run?

A

across the anterior aspects of the bases of the metacarpals

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12
Q

What forms the deep palmar arch?

A

the deep branches of the ulnar and radial arteries

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13
Q

What is dupuytrens contracture?

A

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

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14
Q

What are the neurovascular bundles supplying each finer?

A

medial and lateral palmar; medial and lateral dorsal

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15
Q

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

A

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

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16
Q

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

A

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

17
Q

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

A

skin over the base of the thumb

18
Q

What are the fibrous digital sheaths a continuation of?

A

the longitudinal digital bands of the palmar aponeurosis

19
Q

What do the fibrous digital sheaths attach to?

A

both sides of the phalanges

20
Q

What is the purpose of the fibrous digital sheaths?

A

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

21
Q

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

A

a scaphoid fracture

22
Q

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

A

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

23
Q

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

A

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

24
Q

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

A

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

25
Q

What do the lumricals attach between?

A

the FDP tendon adn the extensor explansion of the same digit

26
Q

What do the the lumbricals span?

A

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

27
Q

What is the action of the lumbricals?

A

to flex the MCP and extend the PIP joitns

28
Q

What is the nervous supply to the lumbricals?

A

medial 2- ulnar nerve

lateral 2- median nerve

29
Q

What is the function of the palmar interossei?

A

adduct the digits (PAD)

30
Q

What is the function of the dorsal interossei?

A

abduct (DAB)

31
Q

What nerve supplies the interossei?

A

ulnar nerve

MSK (39 decks)

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