nervous system part 2 bitch Flashcards
4 major parts of the brain
brain stem, diencephalon, cerebellum, cerebrum
midbrain
auditory/visual reflex
pons
respiration center/connects motor between cerebellum and the cerebrum
medula oblingada
vital centers: respiratory/cardiac
nonvital: coughing/sneezing/etc
diencephalon
middle of the brain
thalmus
relays sensory input to cerebral (afferent)
part of limbic system
motor connections between cerebral cortex and cerebellum
diencephalon
hypothalmus
want center (thirst/hunger/temp)
diencephalon
pituitary gland
pineal gland
secretes melatonin/ keeps sleep cycles
cerebellum
balance/ coordination (motor)
cerebrum
largest part of the brain
frontal lobe
last part to develop
executive thinking (logic)
personality
somatic motor
paritail
somatic sensory (pain/temp/touch)
occipital lobe
vision
temporal lobe
hearing/smell
limbic system
emotion
fight or flight
corpus callosum
connects right and left hemispheres of the brain
association tract
connect gyri on the same hemisphere
connects paritail and occipital lobes
commissural tract
connect gyri with diff hemispheres
corpus callosum
projection tracts
connects different major parts of the brain
spinal chord
serves as a connection between the PNS and the brain
controls simple reflexes
made of tracts (white matter)
and grey matter
brocas
spoken (left for 97%)
pyramidal system
voluntary motor tracts from the cerebrum to the spinal chord
extrapyramidal system
involuntary motor tracts from the cerebral nuclei,brainstem, and cerebellum to the spinal chord
brain tract
bundle of axons in the cns
ascending tracts
sensory/ afferent
carries impulses for touch pressure pain temperature, spacial awareness
first, second, third order neurons
first order neuron
posterior root
second order neuron
soma in the gray matter of the spinal chord
third order neuron
opposite hemisphere of the cerebrum. soma in the thalamus and ends in the cerebral cortex
descending tracts
motor (efferent)
carry the impulses (voluntary/involuntary) from the cerebral cortex to the skeletal muscles
made of upper and lower order neurons
reflex arc
simplest part of the nervous system capable of detecting and responding to the stimulus
receptor
detects change
sends up to first order neuron
afferent neuron
conducts impulse to cns
efferent neuron
conducts impulse to effector (lower motor neuron)
effector
muscle or gland that initiate response
posterior root
sensory
anterior root
motor
somatic reflex
controls skeletal muscles
visceral
control activity of smooth and cardiac muscles
monosynaptic
oen synapse
polysynaptic
many synapses
ipsilateral
can be by itself
stimulis/response occurring on the same side
contralateral
cannot happen alone
response occurs on the opposite side of the stimulus
cranial
controlled by the brain
spinal
controlled by the spinal chord
the blood-brain barrier
help prevent passage of toxins from the blood into the brain
cerebrospinal fluid (csf)
maintain metabolism/ bring nutrients to the brain
constantly being drained and filled
what protective membrane surround the brain and spinal chord
dura matter, arachnid, pia matter
what bones protect the brain and spinal chord
skull=brain
vertebrate= spinal chord
proprioceptors
in muscles/tendons
exteroceptors
at or near anterior body surfaces (sensations)
interoceptors
with the body (organs)
mechanoreceptors
touch/pressure stim
chemoreceptors
chemical stim
thermoreceptors
temperature stim
photoreceptors
light stim
nociceptors
pain stim
tonic receptors
adapt slow and always active
amplitude dependent
phasic receptors
adapt quickly and are only active when there is a change in the conditions that they monitor
generator potential
impulse in receptor cell
receptor potential
release of neurotransmitters–>impulse to another cell
law of adequate stimulus
the receptor that responds best to the stimulus
receptor fields are…
inversely proportional
tactile receptors
outside of the body
barorceptors
free nerve endings, inside
olfactory cranial nerve
sensory, smell
optic
sensory, sight
oculomotor
motor, control of eye movement and focusing
trochlear
motor, control of eye movement
trigeminal
mixed, sensory of face, chewing
adbucens
motor, eye movement
facial
mixed, facial movement and taste
vestibulocochlear
sensory, hearing and balance
glossopharyngeal
mixed, taste
vagus
mixed, taste
accessory
motor, swallowing and head movements
hypoglossal
motor, speech, swallowing, chewing
plexus
collection of spinal nerves
sympathetic nervous system
fight or flight
parasympathetic
rest and digest
excite
ramp up
inhibit
keep it where it should be