3.4.4. Lumbrical Muscle Compartment Flashcards

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

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2
Q

Where are the Extrinsic Muscles of the Hand located?

A
  1. Anterior Compartment of the Forearm

2. Posterior Compartment of the Forearm

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3
Q

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

A
  1. Control Crude Movements

2. Produce a Forceful Grip

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4
Q

Where are the Intrinsic Muscles of the Hand located?

A

Within the Hand itself

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5
Q

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

A

Fine Motor Control of the Hand

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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
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7
Q

How many Muscles are in the Lumbrical Muscle Compartment?

A

4

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8
Q

What is the name of the Muscles in the Lumbrical Muscle Compartment?

A

Lumbrical Muscles

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9
Q

What are each of the 4 Lumbrical Muscles associated with?

A

4 Fingers

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10
Q

Where do the Lumbrical Muscles Originate from?

A

A Tendon of the Flexor Digitorum Profundus

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11
Q

Where do the Lumbrical Muscles travel?

A

Dorsal and Laterally around Each Finger

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12
Q

Where do the Lumbrical Muscles attach distally?

A

The Extensor Hood

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13
Q

What is the function of the Lumbrical Muscles?

A

These are Crucial for Finger Movement, linking the Extensor Tendons to the Flexor Tendons. They cause:

  1. Flexion at the Metacarpophalangeal Joint
  2. Extension at the Interphalangeal Joints
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14
Q

What is the innervation of the Lumbrical Muscles?

A
  1. Lateral 2 Lumbrical Muscles (Index and Middle Finger) are innervated by the Palmar Digital Branch of the Median Nerve
  2. Medial 2 Lumbrical Muscles (Ring and Little Fingers) are innervated by the Deep Branches of the Ulnar Nerve
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