Ch 7 Nervous System

The brain and the spinal cord as a unit

Nerves of the body

• The body's automatic or involuntary functions
• the things that keep you alive

• Consist of 3 part
• -cell body or main part
• -dendrites or branching projections
• -axon or elongated projection

• 1.) Sensory
• -transmit impuleses to the spinal cord and brain from all parts of the body
• 2.) Motor
• -transmit impulses away from the brain and spinal cord
• 3.) Interneurons
• -conduct impulse from sensory neurons to motor neurons

Fatty white substance formed by the Schwann cells that wrap around some axons outside the central nervous system

Such fibers are called myelinated fibers

indentations between adjacent Schwann cells

The outer cell membrane of the Schwann cell

Not present in brain and spinal cord cells

• do NOT specialize in transmitting impulses 
• special type of supporting cells

"glue"

• one of the most common type of brain tumors
• developes from Glia

"star cells"