Nervous System
A.	Function – integrate info throughout body via specialized tissue that conducts 
electrical impulses between brain and body
B.	Structure
1.	Neurons (nerve cells)
2.	Neuroglia (supporting cells)
a.	provide supporting skeleton
b.	isolate and protect cell membranes
c.	regulate composition of interstitial fluid
d.	defend neural tissue from pathogens
e.	aid in repair of injury
3.	Axon structure
a.	unmyelinated (gray matter)
1)	electrical signals propagate more slowly along the entire axon
b.	myelinated (white matter)
1)	schwann cells, nodes of Ranvier ( speed of conduction)
4.	Synapse – gap between neurons
a.	presynaptic terminal (terminal bouton or other axon terminal)
b.	sypnaptic cleft
c.	postsynaptic terminal (target tissue or cell)
5.	nerve cells  nerve fibers  nerve
Divisons
A.	Central Nervous System
1.	Structures
2.	Lobes
a.	frontal (conscious thought, speech, motor, smell, personality)
b.	parietal (sensory, taste, body awareness, language)
c.	temporal (hearing, reading, memory)
d.	occipital (vision)
3.	sub-structures
a.	diencephalon
b.	thalamus
c.	subthalamus (motor functions)
d.	epithalamus (pineal gland- sleep cycle)
e.	hypothalamus (HR, digestion, sexual development, temp regulation, 
      emotion, hunger, thirst)
f.	brain stem (origin of many cranial nerves)
g.	limbic system
h.	RAS (reticular activating system- responsible for maintenance of consciousness)
B.	Peripheral Nervous System
1.	collections of nerves called ganglia
2.	spinal nerves
3.	sensory nerves (afferent nerves) body to brain = DERMATOMES
4.	motor nerves (efferent nerves) brain to muscle 
5.	plexus (organized intermingling)
-5 in body give rise to Peripheral Nerves
C.	Autonomic Nervous System (division of PNS- specifically motor neurons)
1.	no conscious control
2.	regulates fx of internal organs, glands, & smooth muscle