Nervous System Part 2 Flashcards
are cavities within the brain filled w/ CSF
(4 in total)
two lateral, and the fourth drains into the central canal of the spinal cord that contains CSF
ventricles
The skeletal system, meninges, CSF and blood brain barrier do what?
protect the brain
are 3 layers of connective tisue that cover and protect the CNS organs and enclose CSF
Meninges
is a leathery double-layer outer meninx
Dura Mater
is a middle loose layer separated from the dura mater by the subdural space
Arachnoid Meninx
area beneath eneath the arachnoid meninx that has blood vessels and is filled with CSF
Subaracnoid Space
separates the arachnoid layer from dura mater
Subdural Space
is a special fluid formed in the walls of the ventricles from blood plasma by permeating through the choroid plexus
helps protect the brains by providing buoyancy to allow it to float
circulates the ventricles and meninges into subarachnoid space
CSF
inner thin connective tissue tightly attached to the brain
pia mater meninx
formed from a network of blood vessels within the ventricles where CSF permeats through
choroid plexus
is a diffusion barrier that prevents most particles from entering CNS tissue, keeping the brain and spinal cord separate from general blood circulation
formed by the relatively impermeable brain capillaries, due to the glial cells astrocytes
maintenance to this is important for providing a stable chemical environment for nervous system and protect neurons from uncontrollable firing
Blood-brain barrier
foremost part of the brain, is the largest part of the brain in humans comprising about 83% of total brain mass
consists of a left and right cerebral hemisphere
responsible for consciousness
governs intelligence, reasoning and higher thinking
controls activities of the lower parts of the brain and can override their functioning (diencephelan, brainstem, limbic system and cerebellum)
initiates voluntary motor control and controls actions of cerebellum by acting on sensory input via thalamus
i.e. using meditation or medical biofeedback to reduce high heart rate
cerebrum
are two left and right large masses of the cerebrum seperated by median longitudinal fissure
cerebral hemispheres
separates left and right cerebral hemispheres from each other
median longitudinal fissure
cerebral cortex is marked by raised riges of tissues called?
gyri
shallow grooves on brain tissue
sulci
deeper grooves that separate large regions of the brain
fissures
separates the cerebrum from the cerebellum
transverse fissure
cerebral hemispheres are connected by a bridge of white nerve fibers
corpus callosum
outer portion of the cerebral hemisphere that is highly convuluted and gray in color
cerebral cortex
controls higher level executive functions, such as reasoning and decision making
controls motor functions and permits voluntary muscle actions
frontal lobe
receives sensory info from receptors in mouth for taste and those located in skin (touch, pressure, pain)
parietal lobe
interprets visual input
occipital lobe
receives sensory info such as hearing and smelling
temporal lobe
receive or send info in each lobe for one type of sensory or motor info
primary areas
act to integrate more than one type of sensory info for purposeful action
located in each of the four lobes which help to integrate higher and more complex levels of consciousness
(intellect, artisitc/creative abilitiy, learning, memory)
i.e. primary motor cortex in part of the frontal lobe
association areas
controls voluntary motor movements for all parts of the body
aka the precentral gyrus or somatomotor cortex
primary motor cortex
found in the frontal lobe that is responsible for speech production
Broca’s area
located in the temporal love that’s responsible for speech comprehension
Wernicke’s area
medulla oblongata, pons and midbrain are part of the?
brainstem
lies between the spinal cord and pons and is anterior to the cerebellum
contains several vital centers for regulating heartbeat, breathing, and vasoconstriction
contains the reflex centers for vomiting, coughing, sneezing, hiccuping, and swallowing
contains tracts that ascend or descend between the spinal cord and brain’s higher centers
medulla oblangata
is constriction of the blood vessels involved in the regulation of blood pressure
vasoconstriciton
contains bundles of axons traveling between the cerebellum and the rest of the CNS
functions with the medulla to regulate the breathing rate and has reflex centers concerned with head movements in response to visual and auditory stimuli
Pons (“pont” = bridge en francais)
acts as a relay station for tracts passing between the cerebrum and spinal cord or cerebellum
also has reflex centers for higher-level reflexes involving visual, auditory, and tactile responses
contain superior and inferior colliculi
midbrain
regions of the midrain that control reflexes for the head and neck in response to sudden visual or auditory stimulus
superior and inferior colliculi
contain the hypothalamus, thalamus and epithalamus
diencephalon
forms the floor of the third ventricle, maintains homeostasis, or the constancy of the internal environment
contains centers for regulating basic body functions, such as hunger, sleep, thirst, body temperature, water balance, and blood pressure
controls the pituitary gland
serves as a link btw nervous and endocrine systems
hypothalamus (think “homeostasis”)
regulates hormones in the body of the endocrine system
pituitary gland
in the roof of the third ventricle
last portion of the brain for sensory input before the cerebrum
serves aas central relay station for sensory impulses traveling upward from other body parts and the rain to cererum
receives all sensory info (Except smell), filters out unimportant sensory info and directs it to right regions of the cerebrum to be interpreted
thalamus
forms the roof of third ventricle
made of pineal gland
epithalamus
“epi” = above
secretes melatonin and located in the epithalamus
pineal gland
hormone responsible for wake-sleep cycle
produced in pineal gland
melatonin
located inferiolry and posterior to brain
convuluted and divided into 2 hemispheres w/ deep fisures
known as the ‘‘mini-brain”
composed of a thin outer cortex of gray matter and inner white matter
serves to coordinate body movements by relaying info to cerebral motor cortex
involved w/ maintaining balance, controlling certain eye movements, maintaining normal muscle tone, and posture
cerebellum
degree at which muscles remain partially contracted when at rest
monitored and mainted by cerebellum constantly to keep bones and joints in place
muscle tone
receive info from the body trunk
influence motor activities of trunk, shoulder and pectoral girdle
anterior and posterior lobes of cerebellum
intermediate part of the cerebellum
coordinates limb movements
vermis
serve to connect the cerebellum to the other parts of the brain
found on the anterior part of the cerebellum
cerebellar peduncles
involves part of unconscious and conscious brain
aka the emotional/feeling brain b/c stimulation of areas cause rage, pain, pleassure or sorrow
affects emotional aspects of our behavior
involved w/ processes of learning and memory (both long and short term)
found beneath cereral cortex and has neural pathways that connect parts of the frontal lobes, temporal lobes, hypothalamus and thalamus
limbic system
located deep to cerebrum which serves to connect different lobes of cerebrum
also called the limbic lobe
cingulate gyrus
acts as a memory center to help retrieve and store memories
why emotionally charged memories are most vivid is due to involvment of limbic system
hippocampus
smal part of the limbic system involved w/ emotions such as rage and anger
amygdala
a bundle of nerve fibers that act as a connection to hippocampus
fornix
contain fibers that project into thalamus and assist w/ memory of smell
mamillary bodies
masses of gray matter deep within each hemisphere of cerebrum
also part of limbic system
responsible for working w/ cerebellum to regulate motor moovments and learning
contain the putamen, caudate nucleus, and Globus pallidus
overall effect is to have an inhibitory effect on cerebral cortex (slow and control precise movements)
basal nuclei (aka basal ganglia)
a disorder of the basal ganglia
Parkinson’s disease
is a symptom of Parkinson’s disease in which an individual has difficulty w/ motor planning and has rigid movements
Apraxia
where the spinal cord terminates at the first lumbar vertebra
conus medullaris
is a collection of nerve roots in which the spinal cord extends from L1
runs to the end at the coccyx
cauda equina
a single layer sheath separated from vertebral columb by the epidural space
spinal dura mater
extension of pia mater that runs from the conus medullaris to the coccyx
acts as the inferior anchor for spinal cord
filum terminale