Podcast
Questions and Answers
What supplies the flexor compartment of the limb?
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?
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?
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?
What role does reciprocal innervation serve within the nervous system concerning limb muscles?
Which statement best describes the comparison between flexor and extensor skin sensitivity?
Which statement best describes the comparison between flexor and extensor skin sensitivity?
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.
