Question 1

Which of the following best describes the function of the nodes of Ranvier in a myelinated neuron?

Accepted Answer

They allow action potentials to 'jump' from node to node, increasing the speed of nerve impulse conduction.

Question 2

A patient suffers damage to the anterior horns of the spinal cord. Which of the following symptoms would most likely result?

Accepted Answer

Impaired voluntary movement of skeletal muscles

Question 3

Which structure is responsible for receiving incoming signals from other neurons and transmitting them toward the cell body?

Accepted Answer

Dendrite

Question 4

During a lumbar puncture (spinal tap), a needle is inserted into the subarachnoid space. Which of the following best describes the location of this space?

Accepted Answer

Between the arachnoid mater and the pia mater

Question 5

Which of the following best describes the function of the dorsal root ganglion?

Accepted Answer

It contains cell bodies of sensory neurons that transmit information to the spinal cord.

Question 6

A patient has a lesion affecting the lateral horns of the spinal cord. Which function is most likely to be impaired?

Accepted Answer

Regulation of smooth muscle and glandular activity

Question 7

Which of the following correctly matches a spinal cord meningeal layer with its description?

Accepted Answer

Dura mater: the tough, outermost layer

Question 8

Which of the following best explains why myelinated axons conduct impulses faster than unmyelinated axons?

Accepted Answer

Myelin allows action potentials to jump between nodes of Ranvier, a process called saltatory conduction.

Question 9

A person accidentally touches a hot stove and quickly withdraws their hand. Which part of the spinal cord is primarily responsible for transmitting the sensory information from the hand to the central nervous system?

Accepted Answer

Dorsal root

Question 10

Which of the following is the correct sequence of structures that a nerve impulse travels through, starting from the dendrite of a sensory neuron?

Accepted Answer

Dendrite → cell body → axon → synaptic knob

Question 11

A patient is diagnosed with a tumor compressing the ventral roots of the spinal cord. Which of the following symptoms would most likely be observed?

Accepted Answer

Paralysis of muscles innervated by the affected nerves

Question 12

Which of the following best describes a synapse?

Accepted Answer

A gap between the axon terminal of one neuron and the dendrite of another, where neurotransmitters are released

Question 13

Which of the following equations best represents the relationship between conduction velocity ($v$), length of myelinated segments ($l$), and time ($t$) for saltatory conduction?

Accepted Answer

$v = \frac{l}{t}$

Question 14

If the subarachnoid space is accidentally punctured during an epidural injection, which of the following complications is most likely to occur?

Accepted Answer

Leakage of cerebrospinal fluid

Question 15

Which of the following best describes the function of the central canal of the spinal cord?

Accepted Answer

It contains cerebrospinal fluid that helps nourish and protect the spinal cord.

Question 16

A patient presents with loss of autonomic function, including abnormal heart rate and glandular secretion. Which region of the spinal cord is most likely affected?

Accepted Answer

Lateral horn

Question 17

Which of the following statements about the pia mater is correct?

Accepted Answer

It is a delicate, innermost layer that closely adheres to the surface of the spinal cord.

Question 18

Which of the following best explains why damage to the dorsal columns of the spinal cord would result in loss of fine touch and proprioception?

Accepted Answer

The dorsal columns contain ascending sensory axons that transmit fine touch and proprioceptive information to the brain.

Question 19

A patient with multiple sclerosis has demyelination of axons in the central nervous system. Which of the following is the most likely effect on nerve impulse conduction?

Accepted Answer

Slower conduction velocity due to loss of saltatory conduction

Nervous System: Spinal Cord and Nervous Tissue – Study Notes

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