Lecture 14: The Hand Flashcards

1
Q

What is the palmar aponeurosis?

A

Deep to the thick skin of the palm of the hand is a thick web of connective tissue called the palmar aponeurosis

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2
Q

The proximal aspect of the palmar aponeurosis is continuous with the __________ and ___________.

A

Flexor retinaculum & tendon of palmaris longus (when present)

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3
Q

What are the compartments of the hand?

A
  • Thenar compartment
  • Adductor compartment
  • Hypothenar compartment
  • Central compartment
  • Interosseous compartments
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4
Q

What muscles are located in the thenar compartment?

A
  • Abductor pollicis brevis
  • Flexor pollicis brevis
  • Opponens brevis
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5
Q

What are the muscles in the thenar compartment innervated by?

A

The recurrent branch of the median nerve

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6
Q

What are the muscles in the adductor compartment?

A

The adductor pollicis

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7
Q

What is the adductor pollicis innervated by?

A

Deep branch of the ulnar nerve

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8
Q

What is the function of the adductor pollicis?

A

Thumb adduction

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9
Q

What muscles are in the hypothenar compartment?

A
  • Abductor digiti minimi brevis
  • Flexor digiti minimi brevis
  • Opponens digiti minimi
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10
Q

What is the mirror-image of the thenar compartment?

A

The hypothenar compartment

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11
Q

What is the hypothenar muscles innervated by?

A

The deep branch of the ulnar nerve

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12
Q

What are the central compartment muscles?

A
  • Tendons of long flexors (FDS & FDP)

- Lumbricals

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13
Q

Where do lumbricals originate and insert into?

A

Originate from the tendons of FDP and insert into the extensor expansions of digit II to V

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14
Q

How are the lumbricals numbered?

A

Numbered 1-4 from lateral to medial

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15
Q

What are the innervations of the central compartment muscles?

A

1st and 2nd - Median nerve

3rd and 4th - Deep branch of ulnar nerve

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16
Q

What is the action of the central compartment muscles?

A

Flex metacarpophalangeal joint while extending interphalangeal joints

17
Q

What are the muscles of the interosseous compartment?

A
  • 4 dorsal interossei

- 3 palmar interossei