BCS 205 Exam 3 Study Guide: Peripheral Nervous System (PNS)

BCS 205 Exam 3 Study Guide:
Peripheral Nervous System (PNS)

Know that cranial nerves can be motor, sensory, or mixed.

Cranial nerves

CN 0 - Terminal

CN I - Olfactory

CN II - Optic

CN III - Oculomotor

CN IV - Trochlear

CN V - Trigeminal

CN VI - Abducens

CN VII - Facial

CN VIII - Vestibulocochlear

CN IX - Glossopharyngeal

CN X - Vagus

CN XI - Accessory

CN XII - Hypoglossal



(I, Olfactory—Sensory)

(II, Optic—Sensory)

(III, Oculomotor—Motor)

(IV, Trochlear—Motor)

(V, Trigeminal—Both)

(VI, Abducens—Motor)

, (VII, Facial—Both)

(VIII, Vestibulocochlear—Sensory)

(IX, Glossopharyngeal—Both)

(X, Vagus—Both)

(XI, Accessory—Motor)

(XII, Hypoglossal—Motor)




Why are reflexes important?

A reflex is an involuntary or automatic, action that your body does in response to something —
without you even having to think about it. You don't decide to kick your leg, it just kicks. There
are many types of reflexes and every healthy person has them.




Anterior root

carries somatic and visceral motor signals from the CNS to skeletal muscles and gland cells




Spinal nerve

carries visceral motor, somatic motor, and sensory signals to and from the spinal cord




Posterior root

carries sensory signals from the PNS to the spinal cord




Ramus communications