PNS FINAL EXAM | COMPLETE PRACTICE QUESTIONS, ANSWERS &
STUDY GUIDE 2026/2027
Parasympathetic Preggl Origin for Iris and Ciliary Body Innervation - correct answer ✔✔Edinger-
Westphal Nucleus (midbrain)
Cranial Nerve 3 (SOF) - correct answer ✔✔Preggl Parasympathetic Axon
Ciliary Ganglion - correct answer ✔✔Preggl Parasympathetic Axon, Postggl Parasympathetic Cell
Body and Axon
Short Ciliary Nerves - correct answer ✔✔Postggl Sympathetic Axon, Postggl Parasympathetic
Axon
Sympathetic Preggl Origin for Iris and Ciliary Body Innervation - correct answer ✔✔T1 IML
Ventral Root - correct answer ✔✔Preggl sympathetic axon
White ramus - correct answer ✔✔Preggl sympathetic axon (sometimes HT GSA's)
Ascending Sympathetic Chain - correct answer ✔✔Preggl sympathetic axon (sometimes HT
GSA's)
Superior Cervical Ganglion - correct answer ✔✔Preggl sympathetic axon, Postggl
parasympathetic axon and cell body
Internal carotid plexus - correct answer ✔✔Postggl sympathetic axon
, Parasympathetic function Iris and Ciliary Body (receptor, neurotransmitter, effect) - correct
answer ✔✔Constriction and Accommodation M1 ACh excitatory
Sympathetic Function Iris and Ciliary Body (receptor, neurotransmitter, effect) - correct answer
✔✔Dilation alpha 1 NE excitatory
Parasympathetic Preggl Origin (Lacrimal Gland innervation) - correct answer ✔✔Superior
Salivary Nucleus (pons)
Greater Petrosal Nerve - correct answer ✔✔Preggl parasympathetic axon
Nerve of Pterygoid Canal - correct answer ✔✔Preggl parasympathetic axon, postggl
sympathetic axon
Sphenopalatine ggl - correct answer ✔✔Preggl parasympathetic axon, postggl parasympathetic
axon and cell body, postggl sympathetic axon
V2 - correct answer ✔✔Postggl parasympathetic axon, postggl sympathetic axon
Sympathetic Preggl Origin - correct answer ✔✔T1 IML
Deep Petrosal Nerve - correct answer ✔✔Postggl sympathetic axon
Parasympathetic functions (lacrimal gland) - correct answer ✔✔Emotional tears M1 ACh
excitatory
Sympathetic functions (lacrimal gland) - correct answer ✔✔Physiologic tears alpha 1 NE
excitatory
STUDY GUIDE 2026/2027
Parasympathetic Preggl Origin for Iris and Ciliary Body Innervation - correct answer ✔✔Edinger-
Westphal Nucleus (midbrain)
Cranial Nerve 3 (SOF) - correct answer ✔✔Preggl Parasympathetic Axon
Ciliary Ganglion - correct answer ✔✔Preggl Parasympathetic Axon, Postggl Parasympathetic Cell
Body and Axon
Short Ciliary Nerves - correct answer ✔✔Postggl Sympathetic Axon, Postggl Parasympathetic
Axon
Sympathetic Preggl Origin for Iris and Ciliary Body Innervation - correct answer ✔✔T1 IML
Ventral Root - correct answer ✔✔Preggl sympathetic axon
White ramus - correct answer ✔✔Preggl sympathetic axon (sometimes HT GSA's)
Ascending Sympathetic Chain - correct answer ✔✔Preggl sympathetic axon (sometimes HT
GSA's)
Superior Cervical Ganglion - correct answer ✔✔Preggl sympathetic axon, Postggl
parasympathetic axon and cell body
Internal carotid plexus - correct answer ✔✔Postggl sympathetic axon
, Parasympathetic function Iris and Ciliary Body (receptor, neurotransmitter, effect) - correct
answer ✔✔Constriction and Accommodation M1 ACh excitatory
Sympathetic Function Iris and Ciliary Body (receptor, neurotransmitter, effect) - correct answer
✔✔Dilation alpha 1 NE excitatory
Parasympathetic Preggl Origin (Lacrimal Gland innervation) - correct answer ✔✔Superior
Salivary Nucleus (pons)
Greater Petrosal Nerve - correct answer ✔✔Preggl parasympathetic axon
Nerve of Pterygoid Canal - correct answer ✔✔Preggl parasympathetic axon, postggl
sympathetic axon
Sphenopalatine ggl - correct answer ✔✔Preggl parasympathetic axon, postggl parasympathetic
axon and cell body, postggl sympathetic axon
V2 - correct answer ✔✔Postggl parasympathetic axon, postggl sympathetic axon
Sympathetic Preggl Origin - correct answer ✔✔T1 IML
Deep Petrosal Nerve - correct answer ✔✔Postggl sympathetic axon
Parasympathetic functions (lacrimal gland) - correct answer ✔✔Emotional tears M1 ACh
excitatory
Sympathetic functions (lacrimal gland) - correct answer ✔✔Physiologic tears alpha 1 NE
excitatory
