4.1.3. Extensor and Abductor Muscles of the Thumb Flashcards

1
Q

What are the Muscles of the Posterior Forearm commonly known as?

A

Extensor Muscles

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2
Q

What is the General Function of these Muscles?

A

To Produce Extension at the Wrists and Fingers

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3
Q

Which Nerve innervates the Muscles of the Posterior Forearm?

A

The Radial Nerve

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4
Q
  1. How many groups can the Muscles of the Posterior Forearm be Divided into, Anatomically?
  2. What are they?
A
  1. 2
  2. a) Superficial Muscles of the Posterior Forearm
  3. b) Deep Muscles of the Posterior Forearm
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5
Q
  1. How many groups can the Muscles of the Posterior Forearm be Divided into, Functionally?
  2. What are they?
A
  1. 3
  2. a) Muscles which Extend and Abduct / Adduct the Hand at the Wrist Joint
  3. b) Muscles which Extend the Medial 4 Digits
  4. c) Muscles which Extend or Abduct the Thumb
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6
Q

What are the 3 Muscles which Extend of Abduct the Thumb?

A
  1. Abductor Pollicis Longus
  2. Extensor Pollicis Brevis
  3. Extensor Pollicis Longus
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7
Q

Is the Abductor Pollicis Longus an Anatomically Superficial or Deep Muscle of the Posterior Forearm?

A

Deep

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8
Q

Where is the Abductor Pollicis Longus located, in relation to the Supinator Muscle?

A

Immediately Distal to the Supinator Muscle

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9
Q

What does the Tendon of the Abductor Pollicis Longus contribute to in the Hand?

A

Lateral Border of the Anatomical Snuffbox

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10
Q

Where does the Abductor Pollicis Longus Originate from?

A
  1. Interosseous Membrane
  2. Adjacent Posterior Surface of the Radius
  3. Adjacent Posterior Surface of the Ulna
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11
Q

Where does the Abductor Pollicis Longus attach distally?

A

Lateral Part of the Base of Metacarpal I

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12
Q

What is the function of the Abductor Pollicis Longus?

A

Abduction of the Thumb

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13
Q

What is the innervation of the Abductor Pollicis Longus?

A

Posterior Interosseous Branch of the Radial Nerve

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14
Q

Is the Extensor Pollicis Brevis an Anatomically Superficial or Deep Muscle of the Posterior Forearm?

A

Deep

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15
Q

Where is the Extensor Pollicis Brevis located, in relation to the Abductor Pollicis Longus?

A
  1. Medially

2. Deep

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16
Q

What does the Tendon of the Extensor Pollicis Brevis contribute to in the Hand?

A

Lateral Border of the Anatomical Snuffbox

17
Q

Where does the Extensor Pollicis Brevis Originate from?

A
  1. Posterior Surface of the Radius

2. Interosseous Membrane

18
Q

Where does the Extensor Pollicis Brevis attach distally?

A

Base of the Proximal Phalanx of the Thumb

19
Q

What is the function of the Extensor Pollicis Brevis?

A
  1. Extension of the Metacarpopharangeal Joint of the Thumb

2. Extension of the Carpometacarpal Joints of the Thumb

20
Q

What is the innervation of the Extensor Pollicis Brevis?

A

Posterior Interosseous Branch of the Radial Nerve

21
Q

Is the Extensor Pollicis Longus an Anatomically Superficial or Deep Muscle of the Posterior Forearm?

A

Deep

22
Q

Does the Extensor Pollicis Longus have a Larger or Smaller Belly than the Extensor Pollicis Brevis?

A

Larger

23
Q

Where does the Tendon of the Extensor Pollicis Longus travel in the Wrist?

A

Medially to the Dorsal Tubercle

24
Q

How does the Tendon of the Extensor Pollicis Longus use the Dorsal Tubercle?

A

The Dorsal Tubercle is used as a “Pulley” to increase the Force Exerted

25
Q

What does the Tendon of the Extensor Pollicis Longus contribute to in the Hand?

A

Medial Border of the Anatomical Snuffbox

26
Q

Where does the Extensor Pollicis Longus Originate from?

A
  1. Posterior Surface of the Ulna

2. Interosseous Membrane

27
Q

Where does the Extensor Pollicis Longus attach distally?

A

Distal Phalanx of the Thumb

28
Q

What is the function of the Extensor Pollicis Longus?

A

Extension of all Joints of the Thumb:

  1. Extension of the Carpometacarpal Joint
  2. Extension of the Metacarpophalangeal Joint
  3. Extension of the Interphalangeal Joint
29
Q

What is the innervation of the Extensor Pollicis Longus?

A

Posterior Interosseous Branch of the Radial Nerve