
Concept explainers
The large onion-shaped receptors that are found deep in the dermis and in subcutaneous tissue and that respond to deep pressure are (b) tactile discs, (b) lamellar corpuscles, (c) free nerve endings, (b) muscle spindles.

To determine:
The name of onion-shaped receptor found in dermis and subcutaneous tissue which helps in responding to deep pressure is:
Tactile discs
Lamellar corpuscles
Free nerve endings
Muscle spindles
Answer to Problem 1MC
Correct answer:
(b) Lamellar corpuscles are the onion-shaped receptors found in dermis.
Explanation for the correct answer:
Option (b) is given as lamellar corpuscles are onion-shaped receptor found in dermis and subcutaneous tissue which helps in responding to deep pressure. Lamellar corpuscles are one of the four major types of mechanoreceptor cell in glabrous (hairless) mammalian skin. They respond to the mechanical stresses such as pressure and the vibrations. These receptors are found in the dermis and the subcutaneous layers. They are the largest corpuscle receptors. Hence, option (b) is a correct option.
Explanation of Solution
Explanation for the incorrect answers:
Option (a) is given as tactile discs. Tactile receptors are a type of mechanoreceptors that are found on the nerve ending and can sense even very mild touch. They are located in the skin and are predominant in sensitive areas such as lips and tips of fingers. Hence, option (a) is an incorrect option.
Option (c) is given as free nerve endings. The free nerve endings are present in the skin. They help in the reception of the pain, itching, and the changes in the temperature. The free nerve endings are the uncovered nerve endings and they are unspecialized. Hence, option (c) is an incorrect option.
Option (d) is given as muscle spindles. The muscle spindles are the sensory fibers present in the muscles detecting changes in the muscle length. They are not present in the dermis. Hence, option (d) is an incorrect option.
Therefore, it is concluded lamellar corpuscles are the onion-shaped receptors found deep in dermis and subcutaneous tissue which helps in responding to deep pressure..
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Chapter 13 Solutions
Anatomy & Physiology (6th Edition)
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