Unit 5 - PNS Somatic Sensory Flashcards
CNS major components
brain and spinal cord
PNS major components
cranial nerves and spinal nerves
Two divisions of PNS are what?
Somatic Nervous System SNS
2 components, what are they?
Autonomic Nervous System ANS
2 components what are they?
SNS two subdivisions, what are they?
skeletal muscle control (conscious or voluntary) efferent
sensory division (afferent)
ANS two subdivisions, what are they?
sympathetic
parasympathetic
two types of neurons in this system
BOTH the SNS and ANS
use BOTH somatic sensory annnnnd somatic motor NEURONS.
what’s the difference between a somatic sensory neuron (of SNS) and a visceral sensory neuron (ANS) ?
a somatic sensory neuron conducts stimulus information
EX: tactile receptor in the skin
a vis earl sensory neuron (ANS) provides input to activate the ANS
what’s the difference between a somatic motor neuron of the SNS and a visceral motor neuron of the ANS?
a somatic motor neuron innervates skeletal muscle fibers
a visceral motor neuron innervates skeletal, cardiac, and smooth muscle, glands and adipose tissue
define a receptor
dendrites or specialized cells that transmits action potentials from the body and external environment to the CNS
sensory information coming in from
receptors
somatic senses are sometimes referred to as the
general senses
special senses are all in
in the head
photoreceptors, touch receptors, pain receptors, etc are examples of
somatic sensory neurons
skeletal muscle for the somatic motor neurons in the SNS, but there is skeletal muscle tissue innervated in the ANS TOO!! what muscle
the diaphragm, innervated by visceral motor neurons.. it is skeletal muscle
a receptor is a
dendrite
a sensation is really just an
action potential… the arriving info to CNS
somatic sense
conscious perception over
olfaction (smell) special senses
chemoreceptor - smelling a molecule
vision special senses
photoreceptor - rods and cones, cones allow u to see color.
3 types cones
red - red wavelengths
blue - blue wavelengths
green - green wavelengths
visible spectrum of light are the receptors we can
see, UV light, infrared - we don’t have those receptors
men missing two alleles that determine
color vision… that’s why men are more apt to color blindness than women. x linked recessive traits show up wayyy more than in women, because they’re missing the other piece of that chromosome - XY, vs women who have XX. In order for a boy to be colorblind, he has to get it from his mom. It means all of your daughters will carry the trait if a male has the trait. It is an X-linked trait. the severity of colorblindness in a woman if she gets it will be tend to be way worse than in a male.
can stimulate the milk line… Mary got bit! and a third nipple developed… no areola
can have a 3rd nipple
gustatory
chemoreceptors! supertasters, more hairs - wine tasters
equilibrium
MECHANORECEPTOR
function of semicircular canals, different planes of body… stimulates mechanoreceptors to tell u what plane your body is in… there is fluid in the canals that tells you your orientation.
in vestibule, tells you what position your head is in. when bend head, otaliths (crystals) slide over a mechanoreceptor signaling what position your head is in.
so, equilibrium of head and equilibrium of body