Dermis: One of the two layers of skin; a connective tissue layer under the epidermis containing elastic and collagen fibers, capillary networks, and nerve endings.

 

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Dermis: One of the two layers of skin; a connective tissue layer under the epidermis containing elastic and collagen fibers, capillary networks, and nerve endings.

Epidermis: 1. The outermost layer of skin consisting of several layers of epithelial cells&emdash;notably, keratinocytes&emdash;and, in the inner layer of the epidermis, basal cells and melanocytes. 2. . . . View Full Definition

Endodermis: A layer of cells surrounding the vascular cylinder of plants.

Root Hairs: Extensions of the root epidermis that increase the roots ability to absorb water.

Plastids: Membrane-bound organelles in plant cells that function in storage (of food or pigments) or food production. Term for any double membrane-bound organelle. Chloroplasts contain the chemicals f . . . View Full Definition

Skin: One of eleven major body organ systems in animals; the outermost layer protecting multicellular animals from the loss or exchange of internal fiuids and from invasion by foreign microorganis . . . View Full Definition

Palisade: Layer of mesophyll cells in leaves that are closely placed together under the epidermal layer of the leaf. Palisade parenchyma: Columnar cells located just below the upper epidermis in leave . . . View Full Definition

Trichomes: Extensions from the epidermis of the plant that provide shade and protection for the plant.

Hydroxy Acids: Substances penetrating the epidermis and upper dermis aiming to slough dead skin cells, used as anti-aging and anti-wrinkle ingredient in skin care products, the large cosmetic market based . . . View Full Definition

Pacinian Corpuscles: Sensory receptors located deep in the epidermis that detect pressure and vibration.