Presentation is loading. Please wait.

Presentation is loading. Please wait.

Nervous Tissue and Brain

Similar presentations

Presentation on theme: "Nervous Tissue and Brain"— Presentation transcript:

1 Nervous Tissue and Brain
Ch. 10 Nervous system: Nervous Tissue and Brain

2 Function of Relays messages (motor)
Monitors changes in body systems (sensory) Responds to stimuli (sensory) Maintain homeostasis (sensory) Integrative – information is brought to CNS info is put together

3 Central Nervous system
Includes brain and spinal cord Control center, coordinate body activities

4 Peripheral Nervous sys.
Nerves that carry messages to and from the central nervous system

5 Cells of the Nervous System
Neuroganglia – glial cells, nerve glue Supports, protect and nourish the neurons

6 2. Neurons Parts of : Cell body Dendrites – receive impulse
Axon – carries impulse away Myelin sheath- white fatty material Schwann cells (pns) Neurilemma (outdside the sheath) Nodes of Ranvier

7 Types of Neurons Sensory neurons (afferent) – carries impulse to brain and spinal cord.

8 Types of Neurons Motor neurons (efferent) – away from brain and spinal cord.

9 Types of Neurons Interneurons or association neurons – relay impulses from sensory to motor neurons.

10 White matter vs Gray Matter
White because of myelin Gray matter Cell bodies, interneurons, nonmyelinated fibers Nuclei – clusters of cells in CNS Ganglia – cell cluster in PNS

11 The Nerve Impulse Action potential – steps in the nerve impulse
3 stages of : polarization, depolarization, repolarization

12 Step 1: Polarization Resting state of a neuron
Sodium/possium pump – sodium ions out of cells and potassium ions into cells

13 Polarization continued
Inside of the cell is – charged Outside of cell is + charged Due to sodium-potassium pump 2 K+ ions go in as 3 Ca++ go out

14 Step 2: Depolarization Due to stimulation
Inside of the neuron becomes + charged. Na+ rushes into the cell


16 Step 3: repolarization Return to resting state
Due to the pumping out of K+. Na+ blocked Inside of cell negative Continues to synapse

17 Synapse

18 Brain: structure and function
4 main parts of the brain: Cerebrum Diencephalon Brain stem Cerebellum

19 Cerebrum Largest part of the brain
Corpus collosum - Right and left hemispheres Cerebral cortex – gray matter covering the cerebrum                     

20 Cerebrum Continued Function of cerebral cortex – learning, reasoning, language, memory Markings of: gyri (elevations) and sulci (grooves)

21 Diencephalon Thalamus – Hypothalamus -
Relay station for sensory fibers between cerebrum and lower brain. Hypothalamus - Body Temperature Emotions Hunger Thirst Circadian Rhythms

22 Cerebellum Coordinatin of voluntary muscle movements Muscle tone

23 Brain Stem Midbrain-relay station, hearing, vision
Pons – relay station, breathing rate Medulla Oblongata – relay center, heart rate, blood pressure, respiration

24 Ventricles

25 Protection Bone Meninges – 3 layers of connective tissue
Cerebrospinal fluid – Blood brain barrier – cells associated with blood vessels that supply the brain with blood.

26 Aging Brain Enlargement of the ventricular system: the volume of the ventricles Widening of sulci (the grooves) on the surface of the brain. Reduced brain weight and brain volume: loss of neurons. Neurological disorders: Alzheimer's disease, Parkinson's disease and stroke are more common in the elderly.


Download ppt "Nervous Tissue and Brain"

Similar presentations

Ads by Google