nervous system

function

communication/control

CNS

brain/spinal cord

PNS

cranial nerves/ spinal nerves

ANS

Automatic nervous system

cells (2 types)

neuron (carries transmission), neuroglia (glue)

Myelin Sheath

allows electrical impulses to transmit quickly and efficiently along the nerve cells

neurilemma

protects neuron and regenerates nerves

3 neuron types

sensory, motor, interneurons

receptors

exteroceptors, interoceptors, propriocepters

Interorecptors

located in CNS, function: interpreters

Motor neurons

efferent- function: somatic, visceral

neuroglia

nerve glue

nerve impulse

neurons are not connected

synapse

neurotransmitter

Brain

Encephalon

4 major parts

cerebrum- aware, diencephalon- danger alert, brain stem, cerebellum

cerebrum

largest part, fills upper skull, divided into 2 hemisphere by longitudinal fissure

corpus callosum

contralateral control

cerebral cortex

contains: GYRI- folds, sulci-grooves, divided into 4 lobes- FTOP

diencephalon

thalamus

hypothalamus (mid brain)

“master” of master gland

3 sections

midbrain, pon, madulla oblongata

brain stem

vital for life or (foramen magnum- location)

cerebellum

coordination/balance

ventricles/cerebral spinal fluid

ventricles has 4 rooms

meninges: 3 layers

dura (hard), arachnoid (web), pia (small)

circle of willis

blood supply to the brain, carotid arteries/vertebral arteries, combine to form

spinal cord

2 main functions- conducts impulses to and from brain, reflex center

central canal

contains CSF

Autonomic nervous system:

involuntary system, 2 divisions- sympathetic (fight or flight), parasympathetic (relax)

GYRI

folds

Sulci

grooves

divided into 2 hemisphere separated by longitudinal fissure

cerebrum