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Nerve Plexus Quiz

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Questions and Answers

What supplies the flexor compartment of the limb?

Dorsal division of the nerve plexus

Ventral division of the nerve plexus (correct)

Peripheral nerves only

Both divisions equally

Why is the flexor compartment believed to have a richer nerve supply than the extensor compartment?

Flexor muscles require more precise control and efficiency (correct)

Flexor skin has less sensitivity than extensor skin

Extensor muscles are primarily for posture

Flexor muscles are primarily composed of slow-twitch fibers

Which feature is NOT considered a reason for the physiological adaptation of nerve plexus formation?

Composite nature of muscles

High concentration of blood vessels (correct)

Possible migration of muscles from the trunk to the limbs

Overlapping of dermatomes

What role does reciprocal innervation serve within the nervous system concerning limb muscles?

<p>It coordinates the activity between opposing muscle groups (C)</p> Signup and view all the answers

Which statement best describes the comparison between flexor and extensor skin sensitivity?

<p>Flexor skin has higher sensitivity than extensor skin (C)</p> Signup and view all the answers

Study Notes

Nerve Plexus

Nerve Plexuses are formed from ventral rami of spinal nerves.
Each nerve root in the plexus divides into ventral and dorsal divisions.
Ventral divisions supply flexor muscles and the dorsal divisions supply extensor muscles.
Flexor muscles are supplied by a richer nerve supply than extensor muscles.
Flexor skin is more sensitive than extensor skin.
Flexor muscles are more efficient and have precise control compared to coarse extensor muscles.
Formations of plexuses are physiological adaptations, likely due to:
- Overlapping of dermatomes
- Overlapping of myotomes
- Composite nature of muscles
- Possible migration of muscles from trunk to limbs
- Linkage of opposite muscle groups in the spinal cord for reciprocal innervation.

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Description

Test your knowledge on the formation and function of nerve plexuses. This quiz covers the anatomical and physiological adaptations related to flexor and extensor muscles, including their nerve supply and sensitivity. Explore the implications of myotomes and dermatomes in muscle control.