The Nervous System Organ Brain Spinal Cord Nerves

The Nervous System Organ Brain, Spinal Cord, Nerves, sense organs Tissue Nerve tissue, connective tissue, fat, blood Cell Neuron (nerve cell)

CEREBRUM MEDULLA CEREBELLUM

Cerebrum Higher mental functions: concentration planning judgement emotional expression creativity inhibition

coordination of movement balance and equilibrium posture

Medulla heart rate blood pressure body temperature coughing swallowing blinking vomiting Narrows to the spinal cord

Spinal Cord Made of nerves. Carries messages to and from brain. If severed, causes paralysis

Cranium – the bone that protects the brain Fluid – acts as a cushion between the brain and the cranium Membrane – keeps fluid in place.

Nerves and Nerve Cells The body contains billions upon billions of nerve cells (Brain has about 100 billion alone!) Neuron – a nerve cell Carries an impulse from one end to the other, in only one direction, from cell to cell. Sensory Neurons – carry information to the brain Motor Neurons – carry information to the body from the brain

Receptor Cells Specialized cells that monitor how the body is working. temperature How much a muscle cell has been stretched smell Blood pressure sound Carbon dioxide levels light pressure taste Blood sugar levels

Stimulus and Response Nerve sends message to brain – brain sends message to body. Reflex – a response that is controlled from the spinal cord instead of the brain.