Activity 3: Examining the Microscopic Structure of a Nerve and the Structure of General Sensory Receptors

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1

How do you become aware of changes in the environment?

Sensory neurons and their receptors must be functioning correctly.

2

Sensory receptors of sensory neurons can be classified as what 2 things?

1. Modified dendritic endings

2. Specialized cells associated with dendrites that are sensitive to certain environmental stimuli

3

How do sensory receptors react to certain environmental stimuli?

By initiating a nerve impulse

4

Sensory receptors may be classified on what 3 criteria?

1. Type of stimulus they detect

2. Their structure

3. Their body location

5

Exteroceptors respond to stimuli from where and are found how close to the body surface?

Respond to stimuli arising from the external environment and are typically found close to the body surface.

6

Interoceptors respond to stimuli originating from where? Give an example of that location.

Respond to stimuli arising from within the body (such as the visceral organs).

7

Proprioceptors are exteroceptors or interoceptors?

Interoceptors

8

Proprioceptors may be found in what 4 body parts?

1. Skeletal muscles

2. Joints

3. Tendons

4. Ligaments

9

What is the function of proprioceptors?

Report on the degree of stretching.

10

Cutaneous receptors and proprioceptors are classified simply and generally as what group of receptors?

General sensory receptors

11

Where may cutaneous receptors be found?

In the skin

12

T/F. General sensory receptors are nerve endings that are only encapsulated.

(If false, provide an explanation.)

False.

General sensory receptors are nerve endings that are either nonencapsulated or encapsulated.

13

A tactile corpuscle is found in which layer of the skin and where specifically in the skin?

Found toward the surface of the dermis and more specifically in the dermal papillae.

14

Compare the size of the lamellar corpuscles and the tacticle corpuscles.

The lamellar corpuscles are much larger than the tactile corpuscles.

15

What are the 2 major proprioceptors?

1. muscle spindles

2. tendon organs

16

In muscle spindles, dendrites of the sensory neurons coil around specialized skeletal muscle cells called what?

Intrafusal muscle fibers.

17

Tendon organs are composed of what neuronal feature that perforate through the tendon tissue?

Dendrites that perforate through the tendon tissue.

18

Tendon organs are found between what 2 things?

Between the muscle and its tendon attachment.

19

Stretching of the muscles or tendons excites which 2 proprioceptors?

1. muscle spindles

2. tendon organs

20

Stretching of the muscle spindles and tendon organs is then followed by the transmission of what that ultimately reaches which location for interpretation?

Followed by the transmission of electrical impulses that ultimately reach the cerebellum for interpretation.

21
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23
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Identify the blanks (which are receptors and state what stimuli they respond to).

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