Name: Date: 14. The General Senses A. General Receptors 1. Complete the followin

Question

Name: Date: 14. The General Senses A. General Receptors 1. Complete the following table using information from chapter on the skin and sensory receptors in the textbook and from the models. Receptor Location Sensation Free nerve endings Root hair plexus Tactile/Merkel disc Lamellated/Pacinian corpuscles TactileMeissner's corpuseles Temperasivee ain B. Sensory testing - Two-point discrimination 1. Record your observations on two point discrimination in the table below. Minimum difference at which two separate points of stimulation are perceived (mm) Location on the body Forearm Back of neck Palm of hand Upper arm Which area of the body had the largest receptive field? Which area of the body had the smallest receptive field? Larger the receptive field, Smaller the receptive field, (more/less) sensitive is the skin. (more/less) sensitive is the skin. 153

Explanation / Answer

A. General receptors:

1) free nerve endings- location is in dermis; sensation - it detects pain

2) root hair plexus

location- around hair follicle;

sensation-it is a mechanoreceptors for touch sensation

3) tactile-

foundin basal epidermis and hair follicle;

Function-  light touch sensation

4)lamellated/ pacinian corpuscles

Location- skin of the fingers

Sensation- vibration and pressure

5) tactile meissner's corpuscles:

Location - skin

Sensation - light touch

Small receptive fields increase the ability to discern two stimuli that are close together. Lips, fingers, back

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