Integumentary System

Which epidermal strata is marked the letter A?

Stratum corneum

Which epidermal strata is marked the letter B?

Strata lucidum

Which epidermal strata is marked the letter C?

Strata granulosum

Which epidermal strata is marked the letter D?

Strata spinosum

Which epidermal strata is marked the letter E?

Stratum basale

What structure is marked in orange and is superficial?

tactile corpuscles

What structure is marked in pink and is more superficial?

free nerve endings

What structure is marked in green and is more superficial?

sebaceous glands

What structure is marked in orange and is deeper?

Merocrine sweat gland

What structure is marked in green and is deeper?

lamellar corpuscles

What structure is marked in pink and is deeper?

apocrine sweat gland

What structure is marked in yellow and is more superficial?

Arrector pili

What layer is part of the area marked in yellow and is deeper?

Hypodermis

What layer is above the red line?

Papillary layer

What layer is below the red line?

Reticular layer

What structure is highlighted in green?

Hair shaft

What structure is highlighted in pink?

Hair root

What structure is highlighted in yellow?

Hair bulb

What cells are crossed out in blue? Describe them.

Keratinocytes: Most common cell in epidermis; produce keratin which forms protective layer

What cells are crossed out in purple? Describe them.

Corneocytes: Dead keratinocytes; located in the stratum corneum

What cells are crossed out in yellow? Describe them.

Melanocytes: Contribute to skin color; melanin produced by these cells then transferred to keratinocytes; same number of melanocytes in all people

What cells are crossed out in green? Describe them.

Basal stem cell: Located in stratum basale; divide and give rise to keratinocytes

What cells are crossed out in blue? What do they do?

fibroblasts: They produce proteins that make up the matrix of connective tissue proper (e.g., collagen)

What cells are shown and what do they do?

adipocytes: Lipid-filled cells

What structure is crossed out in green?

Dermal papillae

What structure is crossed out in blue?

epidermal ridges

What structure is crossed out in blue?

Hair matrix

What structure is crossed out in green?

Hair papilla

What structure is encircled in red?

tactile Disc

What structure are the yellow lines within the blue circle?

Root hair plexus