ANAT.3601

A group of similar cells & extracellular products that carry out common functions.

The study of tissues & their relationships within organs.

• 1) Epithelial
• 2) Connective
• 3) Muscle
• 4) Nervous

(Tissue)

• 1) Ectoderm ("ecto" = outside/external; "derm" = skin)
• 2) Mesoderm
• 3) Endoderm

Water, protein fibers, and dissolved macromolecules.

Covers or lines every body surface and all body cavities.

Forms internal/external lining of many organs

*NO blood vessels penetrate epithelial cells.

Cellularity: ET is almost all cells.

Polarity: free/top surface, fixed/bottom surfaces.

Attachment: Bound to thin basement membrane.

Avascularity: All EC lack blood vessels (none can penetrate)

Innervation: Environment detection.

Regeneration: frequently damaged but replaced similarly.

Physical protection: ET protect both exposed & internal surfaces from dehydration, abrasion, and destruction.

S. Permeability: All E. cells act as "gatekeepers".

Secretions: secretion through Exocrine glands.

Sensations: Detect changes in the external environment..

A thin extracellular layer between the connective tissue & the epithelium.

Functions to form a molecular barrier between the epithelial and connective tissue.