Q: Which equation best represents the conduction velocity ($$v) of a $$nerve fiber as a function of its diameter ($$d) $$and myelination ($$m$$), where $$m = 1$$ for myelinated and $$m = 0$$ for unmyelinated fibers?

$$v = k \times d \times (1 + m)$$

Question 1

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

Accepted Answer

It transmits sensory and motor information between the brain and the rest of the body.

Question 2

Which layer of the spinal meninges is closest to the spinal cord?

Accepted Answer

Pia mater

Question 3

A patient suffers damage to the dorsal root of a spinal nerve. Which function is most likely to be impaired?

Accepted Answer

Sensory function in the affected area

Question 4

Which of the following correctly matches a spinal cord tract with its function?

Accepted Answer

Dorsal column tract: transmits fine touch and proprioception

Question 5

The ventral horn of the spinal cord gray matter primarily contains:

Accepted Answer

Motor neuron cell bodies

Question 6

Which equation best represents the relationship between the number of spinal nerves ($$N$$), the number of vertebrae ($$V$$), and the number of cervical nerves ($$C) in $$humans?

Accepted Answer

$$N = V + 1$$

Question 7

Which of the following is NOT a component of a reflex arc?

Accepted Answer

Cerebral cortex

Question 8

Which statement best distinguishes between autonomic and somatic reflexes?

Accepted Answer

Autonomic reflexes involve smooth muscle, cardiac muscle, or glands; somatic reflexes involve skeletal muscle.

Question 9

Which of the following best describes the structure of a nerve?

Accepted Answer

A bundle of axons surrounded by connective tissue layers

Question 10

Which major plexus is responsible for innervating the upper limb?

Accepted Answer

Brachial plexus

Question 11

A patient presents with loss of sensation and motor function in the lower limb. Which spinal cord region is most likely affected?

Accepted Answer

Lumbar region

Question 12

Which cranial nerve is responsible for vision and is classified as sensory only?

Accepted Answer

Optic nerve (II)

Question 13

Which of the following best defines a ganglion?

Accepted Answer

A collection of neuron cell bodies in the peripheral nervous system

Question 14

Which reflex is characterized by contraction of a muscle in response to its stretching?

Accepted Answer

Stretch reflex

Question 15

Which equation best represents the conduction velocity ($$v) of a $$nerve fiber as a function of its diameter ($$d) $$and myelination ($$m$$), where $$m = 1$$ for myelinated and $$m = 0$$ for unmyelinated fibers?

Accepted Answer

$$v = k 	imes d 	imes (1 + m)$$

Question 16

Which of the following is true regarding the dorsal root ganglion?

Accepted Answer

It contains sensory neuron cell bodies.

Question 17

Which event occurs first in the process of sensation and perception?

Accepted Answer

Transduction of stimulus by a sensory receptor

Question 18

Which of the following best describes the distribution of the ventral ramus of a spinal nerve?

Accepted Answer

It forms plexuses that innervate the limbs and anterior trunk.

Question 19

A patient exhibits a positive crossed-extensor reflex after stepping on a sharp object. Which best describes this reflex?

Accepted Answer

The ipsilateral limb flexes while the contralateral limb extends to support body weight.

Question 20

Which cranial nerve is both sensory and motor and is involved in facial expression and taste?

Accepted Answer

Facial nerve (VII)

Step-by-Step Guidance for Central and Peripheral Nervous System Study Questions

Study Guide - Practice Questions

Study Guide - Flashcards