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Questions and Answers
Which part of the CNS consists of the brain stem and cerebellum?
What is the function of the bilaterally paired cerebellar hemispheres?
From where do the cranial nerves arise?
What is the function of spinal nerves?
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What is the main function of the ganglia associated with spinal nerves?
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What does the PNS consist of?
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Where is the brain enclosed?
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What is the elongated continuation of the brainstem enclosed in?
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Which of the following is true about the neurons of the dorsal horn?
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What is the function of the ventral roots?
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What is the composition of spinal nerves?
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What is the function of a somatic nerve plexus?
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What is the role of visceral nerve plexuses?
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What is the definition of a reflex?
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What is the primary function of the neurons in the ventral horn?
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What is the consequence of a lesion of a dorsal root?
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What is the outcome of a lesion of a ventral root?
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What is the significance of spinal nerves being mixed nerves?
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What is the role of a nerve plexus in muscle innervation?
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What is the location for cerebrospinal fluid (CSF) sampling?
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Where is the site for epidural anesthesia injection?
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What is the mass of nerves below vertebral level L2 called?
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Which part of the spinal cord carries sensory information upward and motor information downward?
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What is the location of the intermediolateral cell column?
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Where is the spinal cord enclosed in meninges?
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What is the function of dorsal roots?
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What is the function of the spinal grey matter?
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Which part of the spinal cord shows enlargement at cervical and lumbar levels?
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What is the extension of the dural sac to vertebral level S2 called?
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What is the location of the regional variations in the spinal cord?
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Where does the spinal cord end?
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Study Notes
Spinal Cord Anatomy and Function
- The spinal cord is associated with both cranial and spinal nerves, with dermatomes and myotomes at specific levels.
- It is enclosed in meninges, consisting of the dura mater, arachnoid mater, and pia mater, with the subarachnoid space containing cerebrospinal fluid (CSF).
- Spinal nerves are named according to their associated vertebrae, with bilateral paired spinal nerves emerging from specific segments.
- The cauda equina, a mass of nerves below vertebral level L2, extends from the conus medullaris and is enclosed in the dural sac, which extends to vertebral level S2.
- The lumbar cistern, containing CSF, lies between the arachnoid and pia maters and extends to the coccyx.
- The spinal cord ends as the conus medullaris at vertebral level L2, and the nerves below this level form the cauda equina.
- The epidural space, filled with fat and blood vessels, is the site of epidural anesthesia injection.
- Cerebrospinal fluid (CSF) is sampled in a lumbar puncture, with the lumbar cistern being the location for CSF sampling.
- The spinal white matter carries sensory information upward and motor information downward, with sulci delineating it into columns.
- The spinal grey matter forms a continuous column, divided into dorsal and ventral horns, with the intermediolateral cell column present at certain levels.
- Regional variations in the spinal cord include enlargement of ventral horns at cervical and lumbar levels, containing somatic motor neurons innervating the arms and legs, and the presence of IML cell columns and lateral horns.
- Dorsal roots carry sensory information, with neurons of the dorsal horn being primarily sensory.
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Description
Test your knowledge of spinal cord anatomy and function with this quiz. Explore the structure, function, and associated nerves of the spinal cord, including details about the meninges, spinal nerves, cauda equina, and cerebrospinal fluid.
