Integumentary System: The body’s largest organ system, comprising the skin, hair, nails, and associated glands, serving as a protective barrier and involved in various physiological functions.
Epidermis: The outermost layer of skin made of keratinized stratified squamous epithelium; provides a waterproof barrier and skin renewal.
Dermis: The middle layer of skin, composed of dense connective tissue containing blood vessels, nerve endings, hair follicles, and glands; provides strength, elasticity, and nourishment to the epidermis.
Hypodermis (Subcutaneous Layer): The innermost layer consisting of fat and connective tissue; insulates the body, cushions internal organs, and connects skin to underlying tissues.
Hair Follicle: A tubular invagination of the epidermis that anchors hair into the skin; involved in hair growth and sensation.
Nail Plate: The hard keratin structure covering the dorsal surface of the distal phalanx; protects the fingertip and enhances fine motor skills.
1. What is a nail in the context of the integumentary system?
2. What are the main components of the integumentary system as described in the revision sheet?
3. Which layer of the epidermis is located at the deepest level, responsible for generating new keratinocytes?
Integumentary System components
Includes skin, hair, nails, glands
Integumentary System components?
Skin, hair, nails, glands.
Skin layers order
Epidermis, dermis, hypodermis
Epidermis — role?
Provides waterproof barrier, skin renewal.
Epidermis layers
Basale, spinosum, granulosum, lucidum (thick skin), corneum
Dermis — function?
Supports skin, contains blood vessels and nerves.
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