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Body Structures 1 > Hand > Flashcards

Hand Flashcards

1
Q

What is a Boxers fracture?

A

Fracture of the fifth metacarpal (pinky)

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2
Q

What is the most mobile joint in digits 2-5?

A

MP

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3
Q

Flexion/extension of digits 2-5 occurs at which joints?

A

MP
PIP
DIP

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4
Q

Thumb adduction/abduction is in a plane _____ to the plane of the palm.

A

Perpendicular

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5
Q

Thumb flexion/extension is in a plane _____ to the plane of the palm.

A

Parallel

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6
Q

What are the ligaments on the sides of finger joints?

A

Collateral ligaments

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7
Q

What does the volar plate do in the finger?

A

Centers the long flexor tendons and protects against hyperxtension. On the palmar side of the finger

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8
Q

What are the attachments of the flexor digitorum superficialis?

A

Epicondyle of humerus

Base of middle phalanx digits 2-5.

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9
Q

What is the action of the flexor digitorum superficialis?

A

Flex PIP joint

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10
Q

What is the innervation of the flexor digitorum superficialis?

A

Median nerve

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11
Q

What is the action of the flexor digitorum profundus?

A

Proximal ulna

Base of distal phalanx digits 2-5

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12
Q

What is the action of the flexor digitorum profundus?

A

Flexes DIP joint

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13
Q

What is the innervation of the flexor digitorum profundus?

A

Ulnar nerve (medial) AND AIN (lateral)

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14
Q

What are the portions of the tendons of the fingers?

A

Tendon -> tendon sheet (promotes gliding) -> retinacular portion (pulleys that stabilize the tendon and prevent bow-stringing)

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15
Q

What are the attachments of the extensor digitorum?

A 
Lateral epicondyle
Extensor expansion (hood)
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16
Q

What is the action of the extensor digitorum?

A

Extend MP joint (and also IP)

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17
Q

What is the innervation of the extensor digitorum?

A

Posterior interosseous nerve (PIN)

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18
Q

What is the innervation of the extensor indicis proprius and digiti minimi?

A

PIN

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19
Q

What is the juncturae tendinum?

A

Intertendinous connections that couples the actions of digits 2-5

20
Q

What is the extensor/expansion hood?

A

A moveable attachment sheath that drapes over the dorsal part of the digits. When ED contracts, the hood is pulled proximally and extends the IP

21
Q

What is the flexor pollicis longus?

A

Anterior ragius -> distal phalanx of thumb, flexes IP.

22
Q

What is the innervation of the flexor pollicis longus?

A

AIN

23
Q

How you clinically test AIN?

A

Make an “ok” sign. Due to loss of FPL and FDP, cant make round circle.

24
Q

What are the attachments of the extensor pollicis longus?

A

Posterior distal ulna

Base of distal phalanx of thumb

25
Q

What are the innervations of EPL and EPB?

A

PIN

26
Q

What are the attachments of the extensor pollicis brevis?

A

Posterior distal ulna

Base of proximal phalanx of thumb

27
Q

What are the attachments of the abductor pollicis longus?

A

Posterior distal radius and ulna
Base of first MC
Abducts the thumb

28
Q

What is the innervation of ABPL?

A

PIN

29
Q

What De Quervain’s Tenosynovitis? How do you test it?

A

Inflammation of the extensor pollicis brevis and abductor pollicis longus tendons as they glide over radial styloid.

Tested by Finkelstein’s test

30
Q

What is the one branch of the median nerve that does not pass through the carpal tunnel?

A

Palmar cutaneous branch of median nerve

31
Q

What is the primary nerve supplying the thenar intrinsic muscles?

A

Recurrent branch of median nerve

32
Q

What is the nerve supplying the hypothenar intrinsic muscles?

A

Ulnar

33
Q

What is a clinical sign of prolonged carpal tunnel syndrome?

A

Thenar wasting known as Simian ape hand

34
Q

What are the attachments of the lumbrical muscles?

A

FDP tendon

Extensor hood

35
Q

What is the action of the lumbricals?

A

Flex at MP

Extends at PIP/DIP

36
Q

What is the innervation of the lumbricals?

A

Median AND ulnar nerve! Both sides

37
Q

What do the dorsal interossei muscles do?

A

Abduct digits

PAD and DAB

38
Q

What do the palmar interossei muscles do?

A

Adduction

Pad and Dab

39
Q

What innervates the interossei muscles?

A

Ulnar

40
Q

What is a Swan Neck deformity?

A

Laxity of the volar plate causes slippage of collateral ligaments: PIP hyper extension/DIP flexion

41
Q

What is a Boutteniere Deformity?

A

Rupture of the central tendon, through which the PIP joint protrudes. Results in PIP flexion, DIP extension

42
Q

What is a Mallet Deformity?

A

Extensor tendon laxity due to overstretching or rupture which results in decreased efficiency of the extensor hood. Results in inability to extend the DIP.

43
Q

What is tenodesis?

A

The natural flexion of fingers from wrist extension

44
Q

Is there any motor innervation in the hand of the radial nerve?

A

No! Just cutaneous

45
Q

What is the floor of the anatomical snuff box?

A

Scaphoid

Body Structures 1 (13 decks)

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