Unit I Flashcards
How many pairs of cranial nerves attach directly to the brain?
12
cranial nerves exit the skull via
patent openings
How many pairs of spinal nerves are there?
31 mixed pairs
spinal nerves attach to spinal cord by
ventral and dorsal rootlets
what makes up the PNS?
cranial nerves and spinal nerves
What makes up the CNS?
brain and spinal cord
functional subdivisions of PNS
somatic and visceral (autonomic)
divisions of the visceral (autonomic) nervous system
sympathetic and parasympathetic
parasympathetic division contains cranial nerves….. and sacral nerves….
cranial nerves III, VII, IX, X and sacral nerves 2, 3, 4
preganglionic sympathetic neurons release
ACH
postganglionic sympathetic neurons release
NE
preganglionic parasympathetic neurons release
ACH
postganglionic parasympathetic neurons release
ACH
sympathetic division is known as
adrenergic
parasympathetic division is knonw as
cholinergic
Skull opening CN I
cribriform plate of ethmoid bone
Skull opening CN II
optic canal
skull opening CN III
superior orbital fissure
skull opening CN IV
superior orbital fissure
skull opening CN V1
superior orbital fissure
skull opening CN V2
foramen rotundum
skull opening CN V3
foramen ovale
skull opening CN VI
superior orbital fissure
skull opening VII
internal acoustic meatus
skull opening VIII
internal acoustic meatus
skull opening IX
jugular foramen
skull opening X
jugular foramen
skull opening XI
jugular foramen
skull opening XII
hypoglossal canal
pyramidal neurons
initiates movements (cerebral cortex)
extrapyramidal neurons
coordinates movements (brainstem)
where do UMN synapse?
anterior horn of the gray matter (rexed lamina VII)
LMN exits the cord via
anterior (ventral) rootlets
somatic sensory input from the trunk and extremities uses a
three neuron pathway to get from receptor to the cerebral cortex
three neurons in the somatic sensory pathway travel from….
spinal cord, thalamus, cerebral cortex
