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the brain

this major structure is 3 pounds (approximately 2% of the body weight)
uses 20% of the body's oxygen
and is composed of 100 billion multipolar neurons and 1 trillion neuroglia

cerebrum, cerebellum, diencephalon, brain stem

what are the four major parts of the brain

cerebrum

major part of the brain that is the largest part

cerebrum

major part of the brain that contains integration centers for receiving and interpreting sensory information

cerebrum

major part of the brain that contains the integration center for generating and controlling muscle movements

cerebrum

major part of the brain that contains integration centers for providing mental functions such as memory, intellect, creativity, and reasoning

cerebellum

major part of the brain that is the 2nd largest part

cerebellum

major part of the brain that contains the integration centers that coordinate and fine tune voluntary muscles movements

diencephalon

major part of the brain that is the physical center of the brain

diencephalon

major part of the brain that contains relay and integration centers for incoming sensory information

diencephalon

major part of the brain that integrates nervous system and endocrine system

brain stem

major part of the brain that is the "trunk of the brain"

brain stem

major part of the brain that connects parts of the brain to spinal cord

brain stem

major part of the brain that contains integration centers that regulate visceral (autonomic) activities

cranial bones, cranial meninges, cerebral spinal fluid

what are the three things that protect brain tissue ?

cranial meninges

this brain tissue protector is made of three membrane layers that surround the brain. they are continuous with the spinal meninges

dura, arachnoid, pia

what are the three cranial meninges

endosteal, meningeal

what are the two layers of dura mater?

endosteal

this layer of dura mater forms the inner periosteum of the cranium
it is the outer layer

meningeal

layer of dura mater that forms the inner layer. it forms the dural sinus. There is a collecting vein located between 2 layers. There is collecting cerebrospinal fluid and return it to the blood.

arachnoid membrane, arachnoid trabeculae

what are the two layers of the arachnoid mater?

arachnoid membrane

layer of arachnoid mater that is the epithelial layer

arachnoid trabeculae

layer of arachnoid mater that extends across subarachnoid space to the pia mater

pia mater

inner layer of the cranial meninges that holds cerebral blood vessels in place

arachnoid granulations

these are extensions of the arachnoid layer into the dural sinuses. it forms an opening for CSP to drain into dural sinuses

dural folds

these are folds of dura mater that extend deep into the brain

dural folds

these function in separating parts of the brain and anchors and supports the brain in the cranium

dural folds

these function in containing the dural sinuses that collect CSF and return into the blood stream.

ventricles

these are a series of 4 interconnecting chambers in the brain

choroid plexus

lining of ependymal cells that separate CSP

lateral ventricles

venticles 1 and 2. each ins located in each cerebral hemisphere

third

ventricle located in diencephalon

fourth

ventricle located in brain stem
connects with the central canal of the spinal cord

brain stem

this part of brain is considered the primitive brain or the trunk of the brain

brain stem

this part of the brain connects all parts of the brain to the spinal cord

medulla oblongata, pons, midbrain

what are the three parts of the brain stem

medulla oblongata

this part of the brain stem is most inferior.

medulla oblongata

this part of the brain stem is a continuation of spinal cord at foramen magnum
contains many integration centers (nuclei) for maintaining homeostasis
-relay stations (tracts), reflex centers (nuclei), integration centers

relay station, reflex center

what tracts do the medulla oblongata contain?

relay stations

all ascending and descending spinal tracts pass through it
-relay sensory/motor info b/t the spinal cord & brain
-central canal opens into the 4th ventricle

reflex center

has two centers: cardiovascular and respiratory

cardiovascular

center of reflex center that controls rate and force of heart contractions

respiratory

center of reflex center that controls rhythm of breathing

integration center

this part of medulla oblongata processes sensory and motor commands that innervate the throat, neck, back, and digestive organs

pons

this is an anterior bulge, superior to the medulla

relay station, integration center

these are the two functions of the pons

relay station

this function of the pons relays information between cerebellum, brain stem, cerebrum, and the spinal cord

integration center

this function of the pons is sensory and motoe control of the jaws anf face

midbrain

this is the most superior part of brain stem that connects to the diencephalon

relay station

function of midbrain of the descending tracts that relay voluntary motor commands from cerebral cortex to the PNS and cerebellum

reflex station

function of midbrain that initiates reflex movement of the eye, head, neck, and trunk in response to visual and auditory stimuli

reticular activating system

function of midbrain that maintains consciousness and awakening by alerting the cerebral cortex of incoming stimuli

Adjusts postural muscles

function of cerebellum that eceives info from: proproceptors, visual and tactile receptors, inner ear
-coordinates rapid, autonomic adjustments that maintain BALANCE and POSTURE

Fine-tunes movements

function of cerebellum that refines learned movement patterns by:
-monitoring motor commands from the cerebral cortex & brain stem
-comparing this motor info w/ proprioceptor info
-making adjustments to insure smooth movements

ataxia

a disturbance in muscle coordination
-the result of trauma, stroke, or chemical influences to the CEREBELLUM
-causes twitchiness and lack of coordination

thalamus, hypothalamus, epithalamus

what are the three parts of the diencephalon

epithalamus

roof of diencephalon & third ventricle
-contains a choroid plexus
-houses the pineal gland, which secretes melatonin

thalamus

left and right, forms the walls of the diencephalon,
-final relay station for sensory impulses arriving along ascending tracts of the spinal cord

thalamic nuclei

filter incoming sensory info & relay it to the appropriate region of the cerebral cortex of further processing

hypothalamus

forms the floor of the diencephalon
-regulates cardiovascular & respiratory centers of the pons and medulla
-regulates body tempurature
-controls reflexive responses to emotions as part of the limbic system
-controls conscious and unconscious behaviors(unconscious need for water becomes thirst)
-integrates the nervous and endocrine systems
-a stalk-like structure, the infundibulum connects the hypothalamus to the pituitary gland (the master endocrine gland)
-mamillary bodies

mamillary bodies

process olfactory sensation
-cotrol reflexes of chewing,licking , swallowing

white matter

makes up most of cerebrum, deep in cortex, consists of myelinated axon fibers

association fibers

type of white matter that interconnected areas of a SINGLE hemisphere, such as lobes or gyri

commisural

type of white matter that interconnected w/ the 2 hemispheres
-corpus callosum- above diencephalon
-anterior commissure- connects frontal lobes

projection

type of white matter that connect the cerebrum w/ the lower brain structures: diencephalon, brain stem, spinal cord

gray matter

this type of matter is found in 2 areas

Cerebral Cortex

superficial covering of gray matter where all high-level integration occurs

basal nuclei

areas of gray matter deep within the cerebral hemispheres, coordinate the unconscious movement of skeletal muscle: -repeated movements of muscles (walking) -contains stabilizing muscles of trunk

Primary Sensory Cortex

receives sensory info from the thalamus, passes info to other association areas before motor responses are generated

primary motor cortex

initiates motor impulses to voluntary (skeletal) muscles, impulses are modified in other association areas before being directed down the spinal cord

association areas

located in various lobes of the cortex, areas of cortex that analyze + interpret info. from the primary sensory and motor cortexes,

- of the Frontal lobe- contain the primary MOTOR cortex, control higher intellectual processes (concentration, planning, judgement)

- of the Parietal Lobes- contain primary SENSORY cortex, interpret speech and control the selection

- of the Occipital Lobes- visual cortex- interpret VISUAL sensations from the retina of the eye

-of the Temporal Lobes- auditory cortex- interpret auditory sensations from the ear, olfactory cortex- interpret odor sensations from the nasal cavity

limbic system

functional group of nuclei and tracts, located along the boarder of the cerebrum and diencephalon, influences the ENDOCRINE system
-also known as the motivational system, pleasure center of the brain, responsible for emotions of (fear, pain, rage, sexual arousal +pleasure)

limbic system

1. establishes emotional states
2. links conscious (cortex) and unconscious (brainstem) functions
3.memory storage + retrieval

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