Integumentary System

Hair Papilla. Dermal tissue projecting into the hair bulb; supplies capillaries to the matrix.

Sebaceous gland. Branched gland that empties sebum into the hair follicle.

Eccrine sweat gland. Coiled secretory portion in the deep dermis that produces sweat.

Reticular layer of dermis. Deep dense irregular connective tissue layer of the dermis.

Lamellar corpuscle. Deep pressure and vibration receptor with onion-like layers, deep dermis/hypodermis.

Dermal papillae. Finger-like projections of the papillary layer into the epidermis.

Arrector pili. Smooth muscle running from the dermis to the follicle; contraction stands the hair up.

Duct of eccrine gland. Carries sweat from the secretory coil to the sweat pore.

Hair shaft. The portion of the hair projecting above the skin surface.

Reticular layer of dermis. Deep dense irregular connective tissue layer of the dermis.

Epidermis. Superficial stratified squamous epithelium of the skin.

Arrector pili. Smooth muscle running from the dermis to the follicle; contraction stands the hair up.

Stratum lucidum. Thin clear layer found only in thick skin, deep to the stratum corneum.

Epidermis. Superficial stratified squamous epithelium of the skin.

Stratum granulosum. Thin layer superficial to the stratum spinosum where keratinization begins.

Hair root. The portion of the hair embedded in the follicle, below the skin surface.

Sweat pore. Opening of the eccrine sweat gland duct on the skin surface.

Dermal papilla. Finger-like projections of the papillary layer into the epidermis.

Stratum basale. Deepest epidermal layer; single row of mitotic cells on the basement membrane.

Sweat pore. Opening of the eccrine sweat gland duct on the skin surface.

Eccrine sweat gland. Coiled secretory portion in the deep dermis that produces sweat.

Adipose tissue. Fat-storing connective tissue; main component of the hypodermis.

Stratum spinosum. Several cell layers thick, just superficial to the stratum basale.

Stratum corneum. Most superficial epidermal layer of dead, keratinized cells.

Sensory nerve fibers. Afferent fibers carrying signals from skin receptors.

Hair shaft. The portion of the hair projecting above the skin surface.

Hair bulb. The expanded deep end of the follicle containing the hair matrix.

Sebaceous gland. Branched gland that empties sebum into the hair follicle.

Tactile corpuscle. Light-touch receptor sitting in a dermal papilla.

Hypodermis. Adipose and areolar tissue deep to the dermis; not part of the skin.

Tactile corpuscle. Light-touch receptor sitting in a dermal papilla.

Papillary layer of dermis. Superficial areolar connective tissue layer of the dermis.

Hair root. The portion of the hair embedded in the follicle, below the skin surface.

Papillary layer of dermis. Superficial areolar connective tissue layer of the dermis.

Hair papilla. Dermal tissue projecting into the hair bulb; supplies capillaries to the matrix.

Hair bulb. The expanded deep end of the follicle containing the hair matrix.

Sensory nerve fibers. Afferent fibers carrying signals from skin receptors.

Hair follicle. The epidermal/dermal sheath that surrounds the hair root and bulb.

Hypodermis. Adipose and areolar tissue deep to the dermis; not part of the skin.

Hair follicle. The epidermal/dermal sheath that surrounds the hair root and bulb.