Integumentary System Anatomy Flashcards

The nail plate grows from which structure?

Answer: Nail matrix

The nail matrix is the tissue under the base of the nail where keratinized cells are produced to form the nail plate.

Which type of sweat gland becomes active at puberty and is associated with body odor?

Answer: Apocrine glands

Apocrine glands, located in axillary and inguinal regions, become active at puberty and produce a secretion that bacteria break down to cause body odor.

The white, crescent-shaped area visible at the base of the nail is called the:

Answer: Lunula

The lunula is the whitish, crescent-shaped area at the nail base that represents the visible portion of the nail matrix.

Sensory receptors called Meissner's corpuscles are located in which skin layer and detect which sensation?

Answer: Papillary dermis — light touch

Meissner's corpuscles sit in the dermal papillae of the papillary dermis and are specialized for detecting light touch.

Which type of collagen fiber predominates in the dermis and gives skin its tensile strength?

Answer: Type I collagen

Type I collagen is the most abundant collagen in the dermis, forming thick fibers that resist stretching and provide tensile strength.

The skin's acid mantle, with a pH between 4.5 and 5.5, is formed by secretions from which glands?

Answer: Both sebaceous and eccrine glands

The acid mantle is a thin film created by a combination of sebum from sebaceous glands and sweat from eccrine glands that protects against pathogens.

Pacinian corpuscles are sensory receptors that detect:

Answer: Deep pressure and vibration

Pacinian corpuscles are large, encapsulated mechanoreceptors found deep in the dermis and hypodermis that respond to deep pressure and vibration.