Types of Tissues and Bones in the Human Body

Columnar epithelium with goblet cells is called glandular epithelium. Columnar and cuboidal epithelial cells often become specialised as gland cells which are capable of synthesising and secreting certain substances such as enzymes, hormones, milk, mucus, sweat, wax and saliva.

Stratified columnar epithelia is a rare type of epithelial tissue composed of column shaped cells arranged in multiple layers. Stratified columnar epithelia are found in the ocular conjunctiva of the eye, in parts of the pharynx and anus, the female's uterus, the male urethra and vas deferens.

Mucous connective tissue is a type of connective tissue found during fetal development. It is composed mainly of ground substance with few cells or fibers. It is most easily found as a component of Wharton's jelly. Mucous connective tissue forms the umbilical cord.

Elastin is a protein in connective tissue that is elastic and allows many tissues in the body to resume their shape after stretching or contracting. Elastin helps skin to return to its original position when it is poked or pinched.

Sesamoid bones are usually short bones, imbedded in a tendon. The most obvious example of this is the patella (knee cap) which sits within the patella or quadriceps tendon.

Ligament most commonly refers to a band of rona, fibrous dense regular connective tissue bundles, made of attenuated collagenous fibers; with said bundles protected by dense irregular connective tissue sheaths.

A reticular cell is a type of fibroblast that synthesises type III collagen and uses it to produce reticular fibers. Reticular cells are found in many tissues including the spleen, lymph nodes and lymph nodules. They also direct B cells and T cells to specific regions within the lymphatic tissue.

An osteocyte, a star-shaped cell, is the most commonly found cell in mature bone, and can live as long as the organism itself. Although osteocytes are relatively inert cells, they are capable of molecular synthesis and modification, as well as transmission of signals over long distances, in a way similar to the nervous system.

Fas ligand (CD178) is expressed on activated T cells. The interaction with FAS which is a protein on many cell types triggers enzymes to degrade the target cell DNA.

Each osteon consists of concentric layers, or lamellae, of compact bone tissue that surround a central canal, the haversian canal. Osteons are connected to each other and the periosteum by oblique channels called Volkmann's canals or perforating canals.

Tendons consist of dense regular connective tissue fascicles encased in dense irregular connective tissue sheaths. Normal healthy tendons are composed mostly of parallel arrays of collagen fibers closely packed together.

In a saddle joint, the opposing surfaces are reciprocally concave-convex. Saddle joints are said to be biaxial, allowing movement in the sagittal and frontal planes. The best example of saddle joints are first carpo metacarpal joints, joints between femur and patella, calcaneocuboid joints.