Tissue Layer ★

Several major organ systems are characterized by specific tissue layer arrangements: The skin consists of three primary layers:

At the cellular level, tissues are organized into four primary types that form layers throughout the body: tissue layer

: A tough connective tissue layer containing blood vessels, nerves, and glands. Several major organ systems are characterized by specific

: Specialized for communication via electrical signals. 2. Specialized Organ Layers and stratum basale ).

: Forms coverings and linings. It is classified by cell shape (squamous, cuboidal, columnar) and number of layers— simple (single layer) or stratified (multiple layers).

: The outermost epithelial layer, itself made of up to five sub-layers (from superficial to deep: stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale ).