Nervous System Flashcards
Brain, Spinal Cord
CNS structure
Cranial nerves, spinal nerves
PNS structure
Incoming sensory information
Afferent
Outgoing motor information
Efferent
CNS motor signals to muscles, voluntary
Somatic Nervous system
Involuntary (signals to heart, digestion, glands)
Autonomic Nervous system
Fight or flight
Sympathetic Nervous system
Feed and breed, repair and repose, rest and digest, etc.
Parasympathetic Nervous system
produce nerve impulses and neurotransmitters
Neuron
nerve cell bodies in the CNS
Perikaryon
RER in nerve cells
Nissel Substance
Outgoing information from neurons, transmitter
Axon
incoming information to neurons, receiver
Dendrite
support cells for neurons
Neuroglia (Glial Cells)
support cells of the CNS, provides structure and nutrition for neurons (Glial Cell)
Astrocytes
myelin of the CNS, myelinates axons (insulated axons) (Glial Cell)
Oligodendrocytes
support cells of the PNS, Astrocyte of the PNS (Glial Cell)
Satellite Cells
myelin of the PNS, Oligodendrocyte of the PNS (Glial Cell)
Neurolemma, Schwann cells
Phagocytic cells, immune system cell (Glial Cell)
Microglia
produces CSF (Glial Cell)
Ependymal Cells
connects axons
Nodes of Ranvier
nerve cell bodies(Perikaryon) + glial cells
Grey Matter
myelinated nerve cell processes(axons) + glial cells
White Matter
nerve cell bodies outside the CNS
ganglia
collection of nerve cell bodies inside the CNS
nucleus
bundle of nerve fibers inside the CNS
nerve tracts
electrical signal travels through gap junctions between neurons (common in the heart)
electrical synapses
use neurotransmitters for signaling (most common, neuron + axon)
chemical synapses
motor signals/functions in the spinal cord
ventral roots
sensory signals/functions in the spinal cord(dorsal root ganglion)
dorsal roots
takes sensory information up the spinal cord to the brain(dorsal)
ascending tracts
takes motor information down the spinal cord from the brain(ventral)
descending tracts
nerves that supply skin, muscles of the face, neck, and shoulders
C1-C5
phrenic nerves to diaphragm (breathing regulation)
C3-C5
brachial plexus, arm muscles
C5-T1
location of the termination of the cord (becomes filamentous)
L2
transection causes quadriplegia
C5-T1
transection can cause paraplegia
T1-L2
mapping pattern for body sensation, dictated by spinal nerves
dermatomes
inner layer of meninges, forms blood brain barrier, includes the Choroid plexus
pia mater
secretes CSF
choroid plexus
middle layer of meninges, fluid filled space, contains blood vessels, “concussion cushion”
arachnoid mater
outer layer of meninges, made of dense connective tissue
dura mater
CSF flow
lateral ventricle (choroid plexus)
foramen of Monroe
Third ventricle (Choroid plexus)
Cerebral Aqueduct
Fourth Ventricle (Choroid plexus)
foramen of Magendie, Luschka
Subarachnoid space
Arachnoid Villi
Sagittal Sinus
smell, sight, hearing, taste, touch, speech, body motor and sensory control, cognitive reasoning
telencephalon function
sense of smell, olfactory lobes, bulbs, tracts
rhinencephalon
grey matter exterior
gray matter location in the brain
white matter interior
white matter location in the brain
the way gray matter in the brain is arranged, bumpy surface
gyrus
spaces between gyrus’s (folds)
sulcus
links the right brain and left brain
corpus collosum
location of lateral ventricles and foramen of Monroe
telencephalon
location of thalamus, hypothalamus, third ventricle, pineal gland, optic chiasm
diencephalon
integration areas to cerebrum
thalamus
regulation of hunger, thirst, temperature, hormones
hypothalamus
circadian rhythm control
pineal gland
location of the corpora quadrigemina, superior colliculi, inferior colliculi, cerebral peduncles, and cerebral aqueduct
Mesencephalon (Midbrain)
eye and head movements for vision
superior colliculi
head and trunk movements for hearing
inferior colliculi
connects the ascending and descending tracts to the brain
cerebral peduncles
location of the cerebellum and fourth ventricle
Metencephalon
coordinates muscle movements, maintains equilibrium and posture,
cerebellum
location of the medulla oblongata
Myelencephalon
visual cortex, primary visual area, location of the visual association area
occipital lobe
recognition of visual maps (faces, objects)
visual association area
primary auditory area, location of the auditory association area
temporal lobe
recognition of sound maps (sirens, animal noises)
auditory associate area
primary motor cortex, (skilled, voluntary motor movements)
precentral gyrus
contralateral mapping, upside down mapping, motor homunculus (hands and face)
precentral gyrus mapping
splits the pre and post central gyrus
central sulcus
somatosensory area (body sensation map,)
location of the gustatory area
postcentral gyrus
contralateral mapping, upside down mapping, sensory homunculus (fingers and lips)
postcentral gyrus mapping
interprets taste
gustatory area
somatosensory association area, interprets sensory info
parietal lobe
location of the premotor cortex, frontal eye field area, Broca’s area, and the prefrontal cortex
frontal lobe
memory bank for skilled motor activities (muscle memory, playing piano, typing, etc.)
premotor cortex
voluntary eye movements
frontal eye field area
motor for speech
Broca’s area
complex learning, personality (makes us human)
prefrontal cortex
visceral sensation
insular cortex
right hand control
language skills (speaking and writing)
numeric and scientific skills
reasoning
left brain
left hand control
music and artistic skills
imagination
spacial relationships
mental images or sight, sound, touch, taste, smell
right brain
easily reversable state of inactivity characterized by a withdrawal of interaction with the external environment
activated by serotonin and immune system regulators
sleep
light sleep
stage 1
transitional stage
stage 2
slow wave sleep: EEG “Delta Waves” arousal is difficult
stage 3, 4
rapid eye movement, EEG looks like an awake person, skeletal muscles are inhibited, dreaming evident
REM sleep
severe decrease in mental function due to injury, infection, or drug overdose, loses ability for arousal, behavioral, mental function, and sleep wake cycles disappear
Coma
characterized by flat EEG, apnea, no response to stimuli, lack of pupil response, and no eye movement w/ cold water exposure, vital organs may still be functioning
brain death
The location where optic nerves cross
Optic chiasm