Nervous System Overview

Questions and Answers

Which type of sensory receptor allows us to feel an insect landing on our skin?

Mechanoreceptor (correct)

Chemoreceptor

Nociceptor

Thermoreceptor

______ are collections of neuron cell bodies associated with nerves in the PNS.

Myelin sheaths

Nerves

Fascicles

Ganglia (correct)

Nerves that only carry impulses away from the central nervous system (CNS) are called:

Motor nerves (correct)

Sensory nerves

Afferent nerves

Mixed nerves

Which connective tissue layer directly surrounds each axon in a nerve?

Endoneurium Signup and view all the answers

Spinal nerves are all classified as:

Mixed nerves Signup and view all the answers

The majority of the cranial nerves attach to the:

Brain stem Signup and view all the answers

Which of the following cranial nerves carries only sensory information?

Olfactory Signup and view all the answers

The knee-jerk reflex is an example of a:

Stretch reflex Signup and view all the answers

Which of the following lists the hierarchy of motor control from lowest to highest level of control?

Segmental level, projection level, precommand level Signup and view all the answers

The thickest and longest nerve in the body is the:

Sciatic nerve Signup and view all the answers

Which reflex is important for maintaining muscle tone?

Stretch reflex Signup and view all the answers

Pressure, pain, and temperature receptors in the skin are ________.

Exteroceptors Signup and view all the answers

Potentially damaging stimuli that result in pain are selectively detected by ________.

Nociceptors Signup and view all the answers

Select the statement that is most correct.

Ganglia associated with afferent nerve fibers contain cell bodies of sensory neurons. Signup and view all the answers

Nerves that carry impulses toward the CNS only are ________.

Afferent nerves Signup and view all the answers

There are ____ pairs of cranial nerves.

12 Signup and view all the answers

Choose the false statement about nerves.

The majority of a nerve's bulk is due to axons. Signup and view all the answers

The only cranial nerves to extend beyond the head and neck region are the vagus nerves.

True Signup and view all the answers

The glossopharyngeal nerve is the only cranial nerve that contains sensory fibers.

False Signup and view all the answers

Which cranial nerve transmits information about our sense of equilibrium?

Vestibulocochlear Signup and view all the answers

The abducens nerve ________.

Supplies innervation to the lateral rectus muscle of the eye Signup and view all the answers

Ventral spinal cord roots contain fibers, while the dorsal roots contain fibers.

motor, sensory Signup and view all the answers

Somatic reflexes activate:

Skeletal muscle Signup and view all the answers

Which of the following is the correct simple spinal reflex arc?

Receptor, afferent neuron, integration center, efferent neuron, effector Signup and view all the answers

The patellar 'knee jerk' reflex is an example of a(n):

Stretch reflex Signup and view all the answers

Study Notes

Sensory Receptors

Mechanoreceptors enable the sensation of touch, such as feeling an insect landing on skin.
Nociceptors are specialized to detect potential harm resulting in pain.

Nervous System Structure

Ganglia are clusters of neuron cell bodies located in the peripheral nervous system (PNS).
Endoneurium is the connective tissue layer that encases each axon within a nerve.
Spinal nerves are categorized as mixed nerves, which transmit both sensory and motor information.

Cranial Nerves

The majority of cranial nerves (12 pairs) are connected to the brain stem.
Olfactory nerve is the sole cranial nerve dedicated strictly to sensory functions related to smell.
Vagus nerves are unique in extending beyond the head and neck regions.

Reflexes and Control

The knee-jerk reflex illustrates a stretch reflex, demonstrating the body’s automatic response to stimuli.
Motor control hierarchy progresses from segmental level to projection level, and finally to precommand level.
Stretch reflexes play a critical role in maintaining muscle tone.

Reflex Arcs and Types

A simple spinal reflex arc follows this order: receptor, afferent neuron, integration center, efferent neuron, effector.
Somatic reflexes specifically activate skeletal muscles.
Ventral roots of spinal cord carry motor (efferent) fibers while dorsal roots carry sensory (afferent) fibers.

Miscellaneous

The sciatic nerve is recognized as the longest and thickest nerve in the human body.
The glossopharyngeal nerve does not exclusively contain sensory fibers, indicating that other cranial nerves also possess sensory functions.
Pressure, temperature, and pain receptors in the skin are classified as exteroceptors.

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Description

Explore the fascinating structures and functions of the nervous system in this quiz. Test your knowledge on sensory receptors, cranial nerves, and reflexes. Understand how mechanoreceptors and nociceptors contribute to our sensory experience.