3.4.1. Thenar Muscle Compartment Flashcards Preview

3rd Year - MSK Upper Limb Anatomy > 3.4.1. Thenar Muscle Compartment > Flashcards

Flashcards in 3.4.1. Thenar Muscle Compartment Deck (28)
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1
Q

What are the 2 Groups, which the Muscles that act on the Hand, can be Divided into?

A
  1. Extrinsic Muscles

2. Intrinsic Muscles

2
Q

Where are the Extrinsic Muscles of the Hand located?

A
  1. Anterior Compartment of the Forearm

2. Posterior Compartment of the Forearm

3
Q

What are the functions of the Extrinsic Muscles of the Hand?

A
  1. Control Crude Movements

2. Produce a Forceful Grip

4
Q

Where are the Intrinsic Muscles of the Hand located?

A

Within the Hand itself

5
Q

What is the function of the Intrinsic Muscles of the Hand?

A

Fine Motor Control of the Hand

6
Q

What are the 5 Muscle Compartments, of the Intrinsic Muscles of the Hand?

A
  1. Thenar Muscle Compartment
  2. Hypothenar Muscle Compartment
  3. Adductor Compartment
  4. Lumbricals and Long Flexor Tendons (Central) Compartment
  5. Interossei Compartment
7
Q

How many Thenar Muscles are there?

A

3

8
Q

Where are the Thenar Muscles Located?

A

The Base of the Thumb

9
Q

What is the name of the Bulge which the Thenar Muscle Bellies produce?

A

Thenar Eminence

10
Q

What are the Thenar Muscles responsible for?

A

Fine Movements of the Thumb

11
Q

What innervates the Thenar Muscles?

A

Recurrent Branch of the Median Nerve

12
Q

What are the 3 Thenar Muscles?

A
  1. Opponens Pollicis
  2. Abductor Pollicis Brevis (APB)
  3. Flexor Pollicis Brevis (FPB)
13
Q

Which of the Thenar Muscles is the Largest?

A

Opponens Pollicis

14
Q

Where is the Opponens Pollicis located, in relation to the other 2 Thenar Muscles?

A

Deep to the other 2 (Underneath)

15
Q

Where does the Opponens Pollicis Originate from?

A
  1. Tubercle of the Trapezium

2. Associated Flexor Retinaculum

16
Q

Where does the Opponens Pollicis attach distally?

A

Lateral Margin of the Metacarpal of the Thumb (i.e. the First Metacarpal)

17
Q
  1. What is the function of the Opponens Pollicis?

2. How does it do this?

A
  1. It Opposes the Thumb

2. By Medially Rotating and Flexing the Metacarpal on the Trapezium

18
Q

What is the innervation of the Opponens Pollicis?

A

Recurrent Branch of the Medial Nerve

19
Q

Where is the Abductor Pollicis Brevis (APB) located, in relation to the other 2 Thenar Muscles?

A
  1. Anteriorly to the Opponens Pollicis

2. Proximal to the Flexor Pollicis Brevis (FPB)

20
Q

Where does the Abductor Pollicis Brevis (APB) Originate from?

A
  1. Tubercle of the Scaphoid
  2. Tubercle of the Trapezium
  3. Associated Flexor Retinaculum
21
Q

Where does the Abductor Pollicis Brevis (APB) attach distally?

A

Lateral Side of the Proximal Phalanx of the Thumb

22
Q

What is the function of the Abductor Pollicis Brevis (APB)?

A

Abducts the Thumb

23
Q

What is the innervation of the Abductor Pollicis Brevis (APB)?

A

Recurrent Branch of the Median Nerve

24
Q

Where is the Flexor Pollicis Brevis (FPB) located, in relation to the other 2 Thenar Muscles?

A

Distal to them both

25
Q

Where does the Flexor Pollicis Brevis (FPB) Originate from?

A
  1. Tubercle of the Trapezium

2. Associated Flexor Retinaculum

26
Q

Where does the Flexor Pollicis Brevis (FPB) attach distally?

A

Base of the Proximal Phalanx of the Thumb

27
Q

What is the function of the Flexor Pollicis Brevis (FPB)?

A

Flexion of the Metacarpophalangeal (MCP) Joint of the Thumb

28
Q

What is the innervation of the Flexor Pollicis Brevis (FPB)?

A

Recurrent Branch of the Median Nerve

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