nervous system

parts that make up the nervous system

brain & spinal cord

peripheral nervous system (PNS)

nerves outside central nervous system

autonomic

something you don’t think about

somatic

you think about/ can control

nerve tissues

Made up of special cells called neurons

Found in brain, spinal cord, & extremities

Structure enables them to send info around body

• by conducting electrical signals from 1 area of body to another

____ protects brain

Skull

_____ guards spinal cord

Spine

Brain & spinal cord is surrounded by _____________ _____

cerebrospinal fluid

what does the cerebrospinal fluid help do?

• helps cushion brain & spinal cord from injury

• transports chemicals

• removes wastes that are produced in brain

_____ of some neurons are covered by fatty material called ______

axons, myelin

Myelin sheath

Acts like insulation oh an electrical wire, protects electrical impulses from passing to the wrong neuron

Sensory receptors

Special cells/tissues that receive input from external environment

Main function of nervous system

Transmit info to different parts of the body

Spinal cord function

Shortcut 4 reflexes

Reflexes

Actions that dont require involvement of brain/conscious thought