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MSK dissection > Dissection 6/7 > Flashcards

Dissection 6/7 Flashcards

1
Q

How can infections in the deep hand spread to the anterior compartment of the forearm?

A

Via the midpalmar space and via the carpal tunnel

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2
Q

Optimal grip power of the hand occurs in the wrist in which position?

A

Extended

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3
Q

Movement produced by the interossei muscles

A

Abduct/adduct (PAD DAB)

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4
Q

Movement produced by the lumbricals?

A

Flexion of the MCP joints

Extension of PIP joints of the figners

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5
Q

Venous drainage of the hand

A

Deep: follows arteries
Superficial: dorsal venous network

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6
Q

How does lymph drain from the hand?

A

Via the cubital and axillary nodes

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7
Q

In the DRUJ, which bone pivots around the other?

A

The radius pivots around the ulna

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8
Q

Another name for the transverse carpal ligament?

A

The flexor retinaculum

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9
Q

The tendon of which muscle fuses with the retinaculum?

A

Palmaris longus

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10
Q

What is the carpal tunnel?

A

The carpal bones and the flexor retinaculum

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11
Q

Which tendons enter the carpal tunnel?

A

FDS, FDP, FPL

median nerve also

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12
Q

Which branch of median nerve is spared in carpal tunnel syndrome?

A

Palmar cutaneous branch

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13
Q

Why is the central palm spared in carpal tunnel syndrome?

A

Supplied by palmar cutaneous branch (does not pass through carpal tunnel = not compressed)

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14
Q

Supplies the palmaris brevis

A

Palmar cutaneous branch

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15
Q

Supplies the muscles of the thenar eminence?

A

Recurrent branch of the median nerve

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16
Q

Which nerve and artery course immediately lateral to this carpal bone?

A

Ulnar nerve and artery

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17
Q

Which arteries form the superficial palmar arch?

A

The superficial palmar branch of the ulnar artery and the superficial palmar branch of the radial

(superficial palmar arch is immediately deep to the palmar aponuerosis)

18
Q

Arteries which form the deep palmar arch?

A

The deep branch of the radial artery and the deep branch of the ulnar artery

(deep branch runs across the anterior aspects of the bases of the metacarpals)

19
Q

Pathology affecting the palmar fascia. It causes thickening and shortening (contracture) leading to fixed flexion deformity

A

Dupuytrens

20
Q

How to identify FPL tendon?

A

It has its own sheath (posterior to median nerve)

Do not get this confused with PALMARIS longus which attaches to flexor retinaculum)

21
Q

What are the common palmar digital arteries?

A

Arise from superficial palmar arch

Then bifurcate into a pair of proper palmar digital arteries near the base of the fingers

22
Q

Where does the radial artery bifurcate?

A

Proximal to the carpal tunnel

23
Q

What is a ring block?

A

Anaesthetic put in a “ring” around the finger to anaesthetise all four proper digital nerves
(adrenaline must not be used)

24
Q

Neurovascular supply of the fingers

A

Each finger has 4 neurovascular bundles supplying it:

  • medial palmar
  • lateral palmar
  • medial dorsal
  • lateral dorsal
25
Q

Part of the hand supplied by the ulnar nerve?

A

Medial part of palm
Little finger
Medial half of the ring finger

26
Q

Part of the hand supplied by the median nerve

A

Central/lateral palm
Medial half of the ring finger
Middle and index finger
Thumb (APART FROM SKIN AT THE BASE)

27
Q

Part of the hand supplied by the radial nerve

A

Skin at the base of the thumb

28
Q

Nerve supply to abductor pollicis brevis

A

Median

29
Q

Nerve supply of flexor pollicis bevis

A

Median

30
Q

Nerve supply of opponens pollisi

A

Median

31
Q

Superficial muscles of the thumb

A

Abductor pollicis brevis (proximal)

Flexor pollicis brevis (distal)

32
Q

Deep muscle of the thumb

A

Opponens pollicis

33
Q

Superficial muscles of the hypothenar eminence?

A

Abductor digiti minimi (medially)

Flexor digit minimi brevis (laterally)

34
Q

Deep layer of the hypothenar eminence?

A

Opponens digiti minimi

35
Q

The tendons of the FDS attach to which phalanges?

A

Proximal phalanges

36
Q

The tendons of the FDP and FPL attach to which phalanges?

A

Distal phalanges

37
Q

Borders of the anatomical snuffbox?

A

Anterior: abductor pollicis longus tendon, extensor pollicis brevis tendon

Posterior: extensor pollicis longus tendon

Floor (deep): scaphoid, trapezium

38
Q

How many lumbricals do you have?

A

4 (1 for each finger)

39
Q

Nerve supply to the lumbricals

A

Medial 2 lumbricals: ulnar

Lateral 2 lumbricals: median

40
Q

Action of the lumbricals and where they span?

A

Flexion at the MCPs and extension at the PIP

  • span anterior aspect of MCPs
  • span posterior aspect of DIPs
41
Q

Where do the interosseous muscles attach?

A

MCPs to PIP

(different from lumbricals which are MCP to DIP) yaaaay finally makes sense

42
Q

Nerve supply to the interossei

A

Ulnar nerve

MSK dissection (15 decks)

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