Which of the following is not an epidermal derivative?
a. Hair
b. Sweat gland
c. Sensory receptor
d. Sebaceous gland.

검증된 단계별 안내

Step 1: Understand what an epidermal derivative is. Epidermal derivatives are structures that develop from the epidermis, the outermost layer of the skin. These include hair, sweat glands, and sebaceous glands, which originate from epidermal cells during development.

Step 2: Review each option to determine if it originates from the epidermis. Hair, sweat glands, and sebaceous glands are all well-known epidermal derivatives formed by invagination or differentiation of epidermal cells.

Step 3: Consider the sensory receptor option. Sensory receptors in the skin can be of different types; some are derived from the epidermis, but many, especially mechanoreceptors and other specialized nerve endings, are actually derived from the dermis or neural tissue, not the epidermis.

Step 4: Identify which option does not fit the definition of an epidermal derivative. Since sensory receptors are primarily associated with nerve endings and dermal structures rather than epidermal origin, this option is the one that is not an epidermal derivative.

Step 5: Conclude that the correct answer is the option that is not an epidermal derivative based on the developmental origin of each structure.

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주요 개념

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Epidermal Derivatives

Epidermal derivatives are structures that develop from the epidermis, the outermost layer of the skin. These include hair, sweat glands, and sebaceous glands, which originate from epidermal cells and serve various protective and regulatory functions.

Hair, Sweat Glands, and Sebaceous Glands

Hair, sweat glands, and sebaceous glands are all epidermal derivatives. Hair provides protection and insulation, sweat glands help regulate body temperature through perspiration, and sebaceous glands secrete oils that lubricate the skin and hair.

Sensory Receptors

Sensory receptors in the skin detect stimuli like touch, pressure, and temperature. Unlike hair and glands, many sensory receptors are derived from neural or dermal tissues rather than the epidermis, making them not epidermal derivatives.

Which of the following is not an epidermal derivative?a. Hairb. Sweat glandc. Sensory receptord. Sebaceous gland.