Peripheral Nervous System – Lab Exercise 13

30 fill-in-the-blank flashcards covering cranial nerves, spinal nerve terminology, sensory receptors, reflex arcs, and clinically relevant applications from Lab Exercise 13 on the peripheral nervous system.

Cranial nerve I, which detects the sense of smell, is the __ nerve.

Olfactory

Cranial nerve II, responsible for transmitting visual stimuli, is the __ nerve.

Optic

Cranial nerve III that opens the eye and constricts the pupil is the __ nerve.

Oculomotor

Cranial nerve IV that moves the eye laterally and inferiorly is the __ nerve.

Trochlear

Cranial nerve VI that abducts the gaze by turning the eye laterally is the __ nerve.

Abducens

Cranial nerve VII that innervates the muscles of facial expression is the __ nerve.

Facial

Cranial nerve VIII involved in equilibrium and hearing is the __ nerve.

Vestibulocochlear

Cranial nerve IX containing chemoreceptors that detect blood CO₂ concentration is the __ nerve.

Glossopharyngeal

Cranial nerve X responsible for swallowing movements is the __ nerve.

Vagus

Cranial nerve XI that innervates muscles of speech and moves the head and shoulder is the __ nerve.

Accessory

Cranial nerve XII that innervates muscles of the tongue is the __ nerve.

Hypoglossal

An __ ramus is the larger branch of a spinal nerve that supplies the anterolateral body wall and limbs.

Anterior

The __ root of a spinal nerve contains motor (efferent) fibers.

Anterior (ventral) root

A __ nerve contains both sensory and motor fibers.

Mixed

A __ is a network formed by the anterior rami of spinal nerves.

Nerve plexus

The __ root of a spinal nerve contains sensory (afferent) fibers.

Posterior (dorsal) root

An __ receptor responds to stimuli originating outside the body.

Exteroceptor

An __ receptor monitors the internal environment such as organs and blood vessels.

Interoceptor

The area served by a single sensory neuron is called its __.

Receptive field

The minimum distance at which two points of touch are perceived as separate is the __.

Two-point discrimination threshold

The mechanoreceptors that detect stretch and movement are __ endings.

Ruffini

__ corpuscles detect vibrations and deep pressure in the skin.

Lamellated (Pacinian)

In a reflex arc, the neuron that carries impulses from the CNS to the effector is the __ (efferent) neuron.

Motor

The cranial nerves involved in eye movement tested by tracking a finger are III __, IV __, and VI __.

Oculomotor, Trochlear, Abducens

The __ nerve innervates the diaphragm and is essential for breathing.

Phrenic

An abnormal patellar (knee-jerk) reflex may indicate damage to the – spinal roots.

L3–L4

The cranial nerve affected in Bell’s palsy is the __ nerve.

Facial

__ receptors in the fingertips were likely damaged by a second-degree burn.

Tactile (Meissner) corpuscles

__ alerted your brain to the painful heat when you grabbed the hot cookie sheet.

Nociceptors

Among skin regions, the __ has the smallest receptive fields and greatest two-point discrimination.

Fingertip