Skin: Appendages: Subcutaneous Tissue: Secreting Glands Flashcards
The Layers of the Skin
What are the layers of the skin
- Epidermis
- Dermis
The Layers of the Skin
- Outer layer
- It is also called squamous since superficial layers of cells have become flat and scaly.
Epidermis
The Epidermis
What are the 5 layers of the Epidermis
- Horny layer — stratum corneum
- Clear or translucent layer — stratum lucidum
- Granular layer — stratum granulosum
- Prickle cell layer — stratum spinosum
- Germinal or basal layer — stratum germinativum
Layers of Epidermis
Composed of several thicknesses of degenerated cells that have become mere scales with no cellular
structure.
Stratum corneum/Horny Layer or Outer Layer
Layers of Epidermis
Consists of tiers of cells that have lost their nuclei and cellular outlines due to the degenerative process.
Stratum lucidum/ Clear or translucent layer
Layers of Epidermis
Composed of two or three tiers of flattened cells containing granules.
Stratum granulosum/ Granular layer
Layers of Epidermis
- Consists of several tiers of many-sided cells
Stratum Spinosum/ Prickle Cell layer
- It is composed of loose (areolar) connective tissue with widely separated cells, with fibrous bands and elastic tissue fibers between.
- Corium, or true skin
The Dermis
The Dermis
What are the two layers of the Dermis
- Papillary Layer
- Reticular Layer
The Layers of the Dermis
Its outer surface is elevated into tiny projections with hollows between them.
Papillary Layer
The Layers of the Dermis
- The cells and fibers form an interlacing network.
- Blood vessels and nerves pass through this layer to reach the papillary layer.
Reticular Layer
What are the Appendages of the Skin
- Nails
- Hair
- Sebaceous glands
- Sweat or sudoriferous glands
- Ceruminous glands
Appendages of the Skin
Stratum clear layer has thickened to form a hard protective covering.
Nail
The Nail
Proximal part that is covered by a fold of skin, and hidden from view.
Nail root
The Nail
- Exposed part, with its free edge projecting over the tip of the digit.
Body of the Nail
The Nail
Outer horny layer of epidermis at the base of the nail that tends to grow out over the nail body.
Eponychium
The Nail
Outer horny layer of epidermis at the base of the nail that tends to grow out over the nail body.
Eponychium
Appendages of the Skin
Modification of the epidermis
Hair
The Hair
A small canal opening upon the skin surface and extending down the dermis or even the subcutaneous tissue.
Hair follicle
The Hair
Part below the skin level lying in a hair follicle.
Root of a hair
The Hair
Inner enlarged end of each hair root
The bulb
Appendages of the Skin
- Small secreting glands that lie beside and open into hair follicles.
- Secretes oily substance called sebum.
- Lubricates hair and skin.
Sebaceous Gland
Appendages of the Skin
- Simple tubelike glands consisting of a single canal or duct, and a coiled secreting part.
- Secrete watery solution containing sodium chloride and minute quantities of other waste products including urea.
Sweat or Sudoriferous Gland
Appendages of the Skin
Modified sweat glands located in the external ear that secrete wax into the external acoustic (auditory
meatus)
Ceruminous Glands
Appendages of the Skin
Consists of areolar (loose connective tissue) forms a layer between the skin and such structures as muscles, bones, or organs that lie deep to the skin.
Subcutaneous Tissue
What are the Functions of the Skin
- Protective covering to prevent injury or destruction of underlying tissues.
- Excretes water and some waste products.
- Helps regulate body temperature.
- Contains sensory receptors of sensory nerves, and transmit to the brain, sensations of the external environment.
- Glands are organized units of epithelial cells that extract raw materials from capillaries and intercellular
spaces and manufacture new substances or secretions.
Secreting Glands
What are the two types of Secreting Glands
- Endocrine Glands
- Exocrine Glands
What are the Classifications of Exocrine Glands
- Simple tubular gland
- Branched tubular gland
- Simple saccular or alveolar gland
- Branch saccular or alveolar gland
- Combined tubualveolar gland
The Nail
- is the white part of the nail body, shaped like a half-moon close to the nail root
Lunula
Layers of Epidermis
- Consists of a layer of columnar cells that forms the deepest part of the skin
- Contains a pigment that determines the darkness of skin
Stratum germinativum/ Germinal or basal cell layer