Exocrine Gland

Glandular structure that secretes products, usually through ducts or tubes, to a free epithelial surface.

Ephitelium

Animal tissue that covers external surfaces and lines internal cavities and tubes. One surface is free and the other rests on a basement membrane.

Endocrine Glands

Ductless gland that secretes hormones, which the bloodstream distributes.

Embryo's Primary Tissues

Dense Regular Connective Tissue

Animal tissue with rows of fibroblasts between parallel bundles of fibers. In tendons, elastic ligaments.

Dense Irregular Connective Tissue

Animal tissue with fibroblasts, many asymmetrically positioned fibers in ground substance. In skin and some capsules around organs.

Cartilage

Connective tissue with solid, pliable intercellular material that resists compression.