NERVOUS SYSTEM(=

two types:
peripheral nervous system and central nervous system

pns have 2 types:
somatic and autonomic

autonomic is divided into 2 subsystems
parasympathetic and sympathetic

NERVOUS TISSUE
-connective tissue or muscle tissue

TYPES OF CELLS
-GLIAL OR NEUROGLIA AND NEURONS

Glial cells are specialized cells allowing nervous tissue to perform it's function
TYPES OF CELL UNDER CNS
-microglia(removes debris)
-astrocytes(metabolic and support)
-ependymal(covering and lining cavities)
-oligodendrocytes(lipid insulation)
UNDER PNS
-schwann(myelin)
-satellite cells(support)

Neurons is the control function(EXCITABLE CELL)
it possesses cell body, dendrites and axon
Dendrites-receive info from other cells
Axon-generates and sends signals from other cells
Synapse-gap between neuron and receiving cells
TYPES OF SYNAPSE
-sensory
-motor neurons

POLARIZED CELLS
-resting cells
DEPOLARIZED CELLS
-more positive than resting
HYPERPOLARIZED CELLS
-more negative when it is at rest
REFRACTORY PERIOD
-time when cells cannot accept another stimulus
IMPULSE CONDUCTION
-presence of myelin sheath
-diameter of axon


BRAIN
3 parts
cerebrum, cerebellum and brain stem

CEREBRUM
-divided into right and left hemisphere
Have large sections
-frontal lobe
-parietal lobe
-temporal lobe
-occipital lobe
CEREBELLUM
-posterior to brain. known as the little brain
BRAIN STEM
sections
-medulla oblongata
-pons
-midbrain

DIENCEPHALON
parts
-thalamus
-hypothalamus
-pineal body
-pituitary gland