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