The Nervous System - PowerPoint PPT Presentation

1 / 12
About This Presentation
Title:

The Nervous System

Description:

The Nervous System Don t get nervous about the nervous system Functions of the Nervous System 1. Communication and coordination Adapt and respond to changes from ... – PowerPoint PPT presentation

Number of Views:78
Avg rating:3.0/5.0
Slides: 13
Provided by: teachersS8
Category:
Tags: nervous | system

less

Transcript and Presenter's Notes

Title: The Nervous System


1
The Nervous System
  • Dont get nervous about the nervous system

2
Functions of the Nervous System
  • 1. Communication and coordination
  • Adapt and respond to changes from both inside and
    outside the body
  • 2. Site of reasoning- your brain
  • 3. Two main divisions
  • Central nervous system (CNS) brain and spinal
    cord
  • Peripheral nervous system- the nerves

3
  • Neuron- basic structural unit of the nervous
    system
  • Dendrites- carry impulses towards the cell
  • Axon-carry impulses away from the cell
  • Myelin sheath
  • Synaptic terminal
  • Epinephrine
  • Norepinephrine
  • Acetylcholine

4
  • Nerves are made of many nerve cells
  • Afferent-sensory nerves carry message to brain
  • Efferent-motor neurons carry message from brain
    to muscle
  • Associate- do both
  • Heads up

5
(No Transcript)
6
Central nervous system
  • Brain and spinal cord

7
  • Cerebrum-largest part of brain. Responsible for
    reasoning, thought, memory, speech, sensation,
    etc.
  • Divided into two halves.
  • Further divided into lobes occipital, parietal,
    temporal and frontal

8
  • Cerebellum-responsible for muscle coordination
  • Brain stem- most basic functions respiration,
    swallowing, blood pressure. Lower part (medulla
    oblongata) is continuous with spinal cord

9
  • Spinal cord- begins at foramen magnum and ends at
    second lumbar vertebrae
  • Contains both afferent (to the brain) and
    efferent (motor neurons- away from the brain)

10
  • Both the brain and spinal cord are covered by a
    membrane system called the meninges
  • In addition, the brain has four hollow areas
    called ventricles. Cerebrospinal fluid is
    produced in the ventricles and baths the brain
    and spinal column

11
Peripheral nervous system
  • Somatic system
  • 12 pairs cranial nerves
  • 31 pairs spinal nerves
  • Autonomic
  • Sympathetic
  • Fight or flight
  • Parasympathetic

12
Disorders of the nervous system
  • Meningitis- inflammation of the linings of the
    brain and spinal cord
  • Encephalitis- inflammation of the brain
  • Epilepsy-seizure disorder. Excessive discharge
    from neurons. 1 in 200 suffer. Grand mal or petit
    mal seizures
  • Cerebral palsy- disturbance in voluntary muscular
    action
  • Parkinsons decreased neurotransmitter
  • MS multiple sclerosis- autoimmune
Write a Comment
User Comments (0)
About PowerShow.com