Nerves
Heidi Martinez Period. 1

Function of the nerves system

sensory function- detects changes within the body and the outside body

Integrative function- analyze sensory information stores some aspects that makes decisions regarding appropriate behavior.

Motor function- responds to stimuli by irritating muscular contractions or glandular secretions

Major Division

Central Nervous System- It controls of most bodily functions, including awareness, movements, sensations, thoughts, speech, and memory

Peripheral Nerves System- It consists of the nerves and ganglia outside the brain and spinal cord

3 Types of Neuron Structure

1, Multi polar- many dendrites, one axon

  1. Bipolar- one dendrites, one axon (sensory)
  1. uni polar- fused axon and dendrite (sensory)

Nerve Covering

Types of Neurons

  • sensory neurons: transmit impulse to CNS (the spiral cord and brain ) from all parts of the body
  • Motor Neurons: transmit impulse away from CNS to defectors (2 kinds of tissue muscle)
  • Inter neurons or connecting: transmit impulse from sensory neurons to motor neurons

Nerve- bundle of peripheral axon in the PNS

Tract- bundle of central axon in the CNS

White Matter- tissue composed primarily of the myelinated axon

Gray Matter- tissue composed primary cell body/ unmeylinated

Nerve Covering-made up fibrous connective tissue

Endometrium- surrounds individuals within a nerve fiber

Perineum- surrounds a group of nerve fiber

5 Parts of Reflex Arc

1, Sensory Receptor- afferent nerve ending detects stimulus

  1. sensory/afferent neuron- sends signals to CNS

3, Synapse/ Inter neuron integration center- connect between sensory neuron/ motor neuron

  1. Motor/ efferent neuron- delivers response target
  1. Efferent- target organ response to signal

Spinal Cord Structure/ Function

spinal Cord- connects between the brain/ brain stem to the rest of the body

Structure- white matter, made up of bundles of myelinate nerve fiber ,surrounds a butterfly shape core of gray matter housing inter neurons.

function: 1. to transmit impulse to and from the brain. 2. to house spinal reflexes.

4 major regions of the brain

1) cerebrum (cerebral hemisphere): largest portion/associated with higher mental function.

2) Deprecation: process sensory input/control many homeostatic process

3) Brain Stem: coordinates/regulate visceral

4) Cerebellum: coordinate muscular activity