Nervous System

Divisions of CNS

Brain and Spinal Cord

Parts of the PNS

Cranial Nerves (12 pairs). Spinal Nerves (31 pairs). Autonomic nnd Somatic.

Efferent Nerves

Motor, move away from the brain

Afferent Nerves

Sensory, moves toward the brain

Autonomic Nervous System

Apart of PNS but regulates the bodys involuntary functions. Carrys impulses from CNS to Organs

Sympathetic

Fight or Flight

Parasympathetic

Rest and Digest

Glia

nerve cells that do NOT carry impulses (support cells)

Three types of Nerouns

1. Sensory- carry impulses to spine and brain from body

2. Motor- carry impulses from the brain to muscles

3. Interneuron- the exchange of impulses from sensory to motor

Dendrites

Many branching projections that carry nerve impulses towards the body

Cell Body

Contains the nucleus

Axons

One long projection that carries nerve impulses away from the cell body

Schwann Cell

Glia cell that does not conduct impulses and forms the Myelin Sheath

Astrocytes

Star shaped cells that anchor small blood vessels to nerouns

Microglia

Small, move in inflamed brain tissue to carry out phagocytosis

Oligodendrocytes

form of myelin sheaths on CNS axons.