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Ch. 5 The Integumentary System
Marieb - Human Anatomy & Physiology 11th Edition
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMarieb, Hoehn 11th EditionCh. 5 The Integumentary SystemProblema 7
Capitolo 5, Problema 7

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

Guida verificata passo dopo passo
1
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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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.
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07:02
Other Epidermal Cells

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.
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Percorso guidato
2:04
Sweat Glands

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.
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Sensory Receptors
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Which is not a true statement about the papillary dermis?

a. It is largely areolar connective tissue

b. It is most responsible for the toughness of the skin

c. It contains nerve endings that respond to stimuli

d. It is highly vascular

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The epidermis provides a physical barrier due largely to the presence of

a. Melanin

b. Carotene

c. Collagen

d. Keratin

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Which cell functions as part of the immune system?

a. Keratinocyte

b. Melanocyte

c. Dendritic cell

d. Tactile epithelial cell

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The rule of nines is helpful clinically in

a. Diagnosing skin cancer

b. Estimating the extent of a burn

c. Estimating how serious a cancer is

d. Preventing acne

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Which epidermal cells contain keratohyaline and lamellar granules?

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Count Dracula, the most famous vampire, rumored to have killed at least 200,000 people, was based on a real person who lived in eastern Europe about 600 years ago. He was indeed a “monster,” although he was not a real vampire. The historical Count Dracula may have suffered from which of the following?

(a) Porphyria

(b) EB

(c) Halitosis

(d) Vitiligo

Explain your answer.

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