1. Types of Somatic and Special Senses
Create a new folder in your Google Drive “Senses”
From Google Classroom open Intro to Senses and Somatic sense notes
In the last unit you learned how impulses are transmitted throughout the body.
In this unit we will study how the stimulus is received.

2. Senses Somatic Special
Receptors found in the
Receptors found in the head
Skin
Joints
Muscles
Viscera
Eyes
Nose
Taste Buds
Ears

3. Senses Somatic Special
Sensitive to
Sensitive to
Light
Odor
Taste
Sound
Touch
Pain
Temperature
Pressure

4. Sensory Receptors Definition Types Stimulated by
Structures of the nervous system that gather information about the environment.
Chemoreceptor Pain receptor Thermoreceptor Mechanoreceptor Photoreceptor
Changes in chemical concentrations
Tissue damage
Changes in temperature
Changes in pressure
Changes in light
Link to Biofreeze

5. Focus on the Somatic Sense
Recall The sense organs are: -skin -muscles -joints -viscera

6. Receptors and their function
Physiology
Mechanorecepors
-Free nerve endings
-Meissner’s corpuscles
-Pacinian corpuscles
-sense touch and pressure in epithelial tissue -respond to the motion of objects that barely touch the skin -respond to heavy pressure

8. Physiology Receptor Thermoreceptors Free nerve endings
-sensitive to temperatures above 77 F -most sensitive to temperatures between 50and 68 F
Thermoreceptors
Free nerve endings
-warm receptors
-cold receptors
Thermoreceptors role in maintaining homeostasis

9. Receptor
Physiology
Pain receptor
Free nerve endings
protect the body from further injury, sometimes trigger mechanoreceptors

10. You Try It!
Obtain 2 different colored markers for each group of 2 students.
With your eyes closed, have the person next to you touch the palm of your hand with a colored marker.
Try and point to the same spot with a different colored marker.
Did you locate the spot?
Let each person in the group give it a try.
Answer the questions in your notes.

11. What sense were you using?
Somatic
What sensory receptor were you using? Mechanoreceptor
What sensory nerve ending was used?
Free Nerve Ending
How do you know the palm has been touched?
-Sensory neuron sends a message to the CNS "integration"
-Brain interprets the "sensation"
-Message is "projected" back to the spot via
the motor neuron

12. Imagine a world without senses
visual/auditory/tactile hallucinations
incoherent thoughts
deterioration of intellectual performance
morbid fear and panic