Lesson 3.2 learning the key terms integumentary system

stratum granulosum

A level of somewhat flattened cells and lies just superficial to the stratum spinosum and inferior to the stratum lucidum

Melanin

A pigment that protects the body against the damaging effects of the suns ultraviolet rays

Sebum

An oily substance that helps to keep the skin and hair soft

Melanocytes

Are specialized cells in the skin which produce melanin

Keratinocytes

Cells within the epidermis that make keratin

Dermis

Found between the epidermis and hypodermis also includes nerve endings, glands, and hair follicles

epidermal dendritic cells

Initiate an immune system response to foreign bacteria or viruses

Stratum lucidum

Is the clear layer of thick skin found only on the palms of the hands, fingers, soles of the feet, and toes

integumentary system

Is the enveloping organ of the body that includes the epidermis, dermis, sudoriferous and sebaceous glands, plus hair and nails

Hypodermis

Layer of skin located under the dermis and stores fat

Sebaceous glands

Located all over the body produce sebum

Epidermis

Outer layer of the skin

Sudoriferous glands

Secrete sweat and are distributed in the dermis over the entire body

Reticular layer

The coat of skin superficial to the papillary layer

Stratum corneum

The epidermis's outer layer

Stratum spinosum

The layer of cells in the epidermis superior to the stratum basale and inferior to the stratum granulosum

Papillary layer

The outer coat of the dermis

Merkel cells

The skins touch receptors

Keratin

Tough protein found in the skin, hair, and nails

Stratum basale

the deepest layer of the epidermis