Brain and Spinal cord

Centrally Located

Central Nervous System (CNS)

All nerves extending out to the peripheral parts of the body

Peripherial Nervous system (PNS)

A subdivision of the PNS

Controls things that are automatic/involuntary

HR, contractions of the stomach/intestines, secretion of glands

Autonomic nervous system (ANS)

Conduct impulses TO the spinal cord and brain

Sensory Neurons (Afferent)

Conduct impulses from sensory neurons to motor neurons

Interneurons (central or connecting neurons)

Conduct impulses AWAY from brain and spinal cord to muscles and glands

Motor neurons (Efferent)

1. Astrocytes

2. Microglia

3. Oligodendrocytes

3 Main types of Connective tissue cells of the (CNS)

Common type of brain tumor. Caused from glia

Glioma

Characterized by myelin loss and destruction in central nerve fibers and resulting conduction impairments.

Multiple sclerosis

Characterized by numerous benign tumors. An inherited disease.

Multiple neurofibromatosis

Bundle of peripheral axons (nerve fibers) – looks similar to the insides of a cable

Nerve

Bundle of central axons that can be myelinated and form white matter of the brain and spinal cord

Tract

Brain or cord tissue composed primarily of myelinated axons (tracts)

White matter

Brain or cord tissue composed primarily of cell bodies and unmyelinated fibers

Gray matter

Fibrous connective tissue

Nerve coverings