Somatic cells are usually classified as either epithelial, muscle, nerve, or connective. Cells arranged or organized to perform one or more specific functions are called a tissue. The four basic tissue types found in the human body are classified according to the type of cells that comprise them and have these specialized functions.

Epithelial Tissue: Forms linings and coverings of various body parts and systems.

Muscle Tissue: Contracts to cause movement and to maintain body posture.

Nerve Tissue: Conducts messages (impulses) to and from the central nervous system.

Connective Tissue: Serves as filler and binder substances of the body and forms the supporting framework of the body and the body organs.

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