Slide 1: Homeostasis
Relative uniformity of the normal body’s internal environment Slide 2: What does the nervous system do to create homeostasis? Slide 3: Before the break we talked about
Central Nervous System
anatomy Slide 4: Central Nervous System
What parts can you remember? Slide 5: The subarachnoid space in the brain, the spinal cord & the cerebral ventricles are filled with…
Cerebrospinal fluid (CSF) Slide 6: The brain and spinal cord are surrounded by tough, fluid-filled membranes called
meninges Slide 7: Meninges
Does this word remind you of a disease? Slide 8: Do you remember the name of the part of the nervous system that contains the nerves???
Peripheral Nervous System Slide 9: The part of the nervous system that extends down from the brain toward the rest of the body is…
The spinal cord! Slide 10: How long is the spinal cord in a person of average height?
17 to 18 inches Slide 11: So how does the peripheral nervous system work? Slide 12: Let’s say you are standing by the stove and your arm gets kind of close to the burner. Slide 13: Receptors in the skin feel the heat and send this message to your brain via sensory nerves Slide 14: Your brain says, “You’d better move your arm.”
Motor nerves carry this message to your arm. Slide 15: What are our senses?
Taste Slide 16: Now let’s think about the nerve cell itself.
What do we call nerve cells? Slide 17: Neurons Slide 18: Nerve cells are surrounded by non-neuronal cells called glial cells (also called neuroglia) Slide 19: DON’T PANIC – YOU DON’T HAVE TO WRITE THIS DEFINITION ON THE TEST. You should look for the answer to number 11 here, however.
Neuroglia are like glue, but besides cushioning and holding neurons in place, they also supply nutrients and oxygen to neurons, insulate one neuron from another, destroy pathogens, remove dead neurons, and modulate neurotransmission. Slide 20: Neurons look sort of like trees (if you can imagine seeing the roots too) “soma” is another name for “cell body” Slide 21: The projections that receive impulses and transmit them are called…
dendrites Slide 22: The part of the neuron that contains the nucleus and the mitochondria is…
The cell body Slide 23: The impulses are transmitted away from the cell body by…
axons Slide 24: The gaps between one nerve’s axon and the next nerve’s dendrite are called…
synapses Slide 25: Impulses travel across the synapse by using chemicals called neurotransmitters Slide 26: If we click here we can read a little about neurotransmitters… Slide 27: Let’s look at the neuron again.
Notice the myelin sheaths. Slide 28: Do you remember the difference in gray matter and white matter? It’s myelin. Slide 29: Schwann cells are a type of glial cells that are large, nucleated & form myelin for cells in the PNS Slide 30: Islands of gray matter in the cerebrum are called basal ganglia Slide 31: Do you remember which part of the nervous system regulates involuntary functions?
autonomic Slide 32: What about voluntary functions?
somatic Slide 33: And finally…
Neuron pathways where impulses are conducted from receptors to effectors are called…