1. Types of Somatic and Special Senses
Create a new folder in eBackpack: “Senses”
Upload Intro notes
Upload Structures and physiological events
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

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