Download Nerve Pathways Notes

WARM UP
1. Explain what parts of the nervous
system represent the cell, tissue,
and organ levels of organization.
2. Draw a neuron and label as many
parts as you can.
WARM UP
1. Give an example of each of the following
from the nervous system:
– A cell
– A tissue
– An organ
2. How do neurons work together to signal your
arm to move when you touch a hot stove?
Nerve Pathways
General Pathway
• Stimulus received/sensed by sensory neurons
General Pathway
• Message processed by interneurons
– Brain (integrated thought)
– Spinal cord (reflex arc)
General Pathway
• Response sent through motor neurons
Divisions of the Nervous System
• Central
– Brain and spinal cord
Divisions of the Nervous System
• Peripheral
– Cranial and
spinal nerves
– All other nerves
Divisions of the Nervous System
• Peripheral
– Somatic
• Conscious
control
– Autonomic
• Internal
organs
Divisions of the Nervous System
– Autonomic
• Parasympathetic : “Housekeeping” tasks
• Sympathetic : Control in times of heightened stimuli
Sensory Pathways
• Detect stimuli
• Notify brain and spinal cord
• Use many types of receptors…
Sensory Pathways
• Chemoreceptors
– Chemicals
• Senses of taste and smell
Sensory Pathways
• Mechanoreceptors
– Pressure
• Sense of touch and hearing
Sensory Pathways
• Photoreceptors
– Light
• Sense of sight
Sensory Pathways
• Thermoreceptors
– Heat
• Sense of touch
Sensory Pathways
• Nociceptors
– Pain
WRAP UP
• List the 5 kinds of receptors and
what they do.