when specialized cells join together in a group they form

In addition, specialized epithelial cells function as receptors for special senses (smell, taste, hearing, and vision). Glia - astrocytes, oligodendrocytes, Schwann cells, microglia - blood-brain barrierĮpithelial cells nuclei (histological slide)Įpithelial tissue is a highly cellular tissue that overlies body surfaces, lines cavities, and forms glands. Neurons - soma, dendrites, axons, ganglia (PNS), nuclei (CNS) Types - skeletal, cardiac (gap junctions, intercalated discs), smooth, striated, nonstriated Types of fibers - collagen, reticular, elasticĬlassification - proper (dense, loose), embryonic (mesenchyme, mucous), specialized (cartilage, adipose, bone, blood)įeatures - elastic, extensible, contractile Structure - cells (structural, immunological, defense, energy reservoirs), extracellular matrix (ground substance, protein fibers) Types - squamous, cuboidal, columnar, simple, stratified, pseudostratified, specialized Surfaces - basal (hemidesmosomes, basement membrane), apical (lumen, microvilli, cilia, stereocilia), lateral (adhering junctions, tight junctions, desmosomes, gap junctions) Key facts about the tissue types Epithelial Tissueįeatures - high cellularity, special sensory receptors, forms a barrier, avascular, innervated

Nervous tissue transmits and integrates information through the central and peripheral nervous systems.

Muscle tissue contracts to initiate movement in the body.

Connective tissue underlies and supports other tissue types.

Epithelial tissue creates protective boundaries and is involved in the diffusion of ions and molecules.

There are four basic tissue types defined by their morphology and function: epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

A tissue is a group of cells, in close proximity, organized to perform one or more specific functions.

When specialized cells join together in a group they form