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