Question 1

Which cranial nerve is responsible for transmitting visual information from the retina to the brain, and through which anatomical pathway does it travel?

Accepted Answer

Optic nerve; travels through the optic canals of the sphenoid bone

Question 2

A patient presents with loss of sensation in the anterior thigh and difficulty extending the knee. Which nerve plexus and specific nerve are most likely affected?

Accepted Answer

Lumbar plexus; femoral nerve

Question 3

Which of the following correctly describes the difference in myelination between somatic motor and autonomic motor neurons?

Accepted Answer

Somatic motor neurons are well myelinated (FAST), while autonomic motor neurons are thinly/non-myelinated (SLOWER)

Question 4

Which receptor type is responsible for detecting harmful stimuli causing pain, and where are these receptors typically located?

Accepted Answer

Nociceptors; located throughout the body in skin and organs

Question 5

During a 'fight or flight' response, which physiological changes occur due to sympathetic activation?

Accepted Answer

Increased heart rate, dilated pupils, and increased blood flow to muscles

Question 6

A patient has difficulty tasting sweet and salty foods on the anterior two-thirds of the tongue. Which cranial nerve is most likely damaged?

Accepted Answer

Facial nerve (VII)

Question 7

Which equation best represents the relationship between the number of neurons in the somatic motor pathway versus the autonomic motor pathway?

Accepted Answer

$$N_{somatic} = 1$$, $$N_{autonomic} = 2$$

Question 8

Which structure in the eye is responsible for adjusting the shape of the lens to focus light, and what muscle controls this process?

Accepted Answer

Ciliary body; ciliary muscle

Question 9

A patient reports loss of equilibrium and hearing. Which cranial nerve and anatomical pathway are most likely involved?

Accepted Answer

Vestibulocochlear nerve (VIII); internal acoustic meatus

Question 10

Which of the following best describes the function and location of rod cells in the retina?

Accepted Answer

Dim light vision, more sensitive to light; distributed throughout the retina

Question 11

Which nerve plexus contains the largest nerve in the body, and what is the name of that nerve?

Accepted Answer

Sacral plexus; sciatic nerve

Question 12

Which cranial nerve is responsible for motor innervation of the tongue muscles, and through which canal does it exit the skull?

Accepted Answer

Hypoglossal nerve (XII); hypoglossal canal

Question 13

Which of the following equations correctly represents the pathway of conscious visual information from the retina to the primary visual cortex?

Accepted Answer

$$\mathrm{Photoreceptors} \rightarrow \mathrm{Bipolar\ cells} \rightarrow \mathrm{Ganglion\ cells} \rightarrow \mathrm{Optic\ nerve} \rightarrow \mathrm{Optic\ tracts} \rightarrow \mathrm{Lateral\ geniculate\ nucleus} \rightarrow \mathrm{Optic\ radiation} \rightarrow \mathrm{Primary\ visual\ cortex}$$

Question 14

Which of the following best explains why visceral pain is often poorly localized compared to somatic pain?

Accepted Answer

Visceral sensory neurons have fewer receptors and larger receptive fields

Question 15

Which cranial nerve is responsible for both taste sensation from the posterior third of the tongue and parasympathetic innervation to the parotid gland?

Accepted Answer

Glossopharyngeal nerve (IX)

Question 16

Which of the following structures in the ear is responsible for detecting rotational acceleration, and what is the name of the specialized region containing the sensory hair cells?

Accepted Answer

Semicircular canals; crista ampullaris

Question 17

Which neurotransmitter is released by most postganglionic axons in the parasympathetic division, and what is its effect?

Accepted Answer

Acetylcholine; cholinergic effects such as decreased heart rate and increased digestion

Question 18

Which of the following best describes the function of the phrenic nerve, and from which plexus does it arise?

Accepted Answer

Innervates the diaphragm; arises from the cervical plexus

Question 19

Which of the following equations represents the correct order of taste signal transmission from the tongue to the cerebral cortex?

Accepted Answer

$$\mathrm{CN\ VII\ and\ IX} \rightarrow \mathrm{Solitary\ nucleus\ (medulla)} \rightarrow \mathrm{Thalamus} \rightarrow \mathrm{Gustatory\ area\ (Insula)}$$

Peripheral Nervous System & Special Senses: Study Notes (Chapters 14-16)

Study Guide - Practice Questions

Study Guide - Flashcards