Biology

Rib Cage Definition Rib cage is the bony structure in the chest formed by the ribs and sternum (breastbone) that encloses and protects the heart…

Bronchus Definition Bronchus, also called bronchi is either of the two main branches of the trachea that lead to the lungs, where they divide into…

Proteoglycan Definition Proteoglycan is any of a group of polysaccharide-protein conjugates present in connective tissue and cartilage, consisting of a polypeptide backbone to which many…

Periodontal Fiber Definition Periodontal fiber is attached to the dentin of the root of the tooth by cementum and to the bone of the jaws…

Cholesterol Definition Cholesterol is a main component of blood plasma and cell membranes, and it is an important precursor of many steroid hormones, vitamin D2,…

Elastic Fiber Definition Elastic fibers are generally 0.2-2 mcm in diameter but may be larger in some ligaments; they branch and anastomose to form networks…

Cartilage Definition Cartilage is one of the types of connective tissue in our body. It consists of cells called chondrocytes mixed with collagen and sometimes…

Notochord Definition Notochord is a primitive beginning to the backbone. The word notochord comes from the Greek words notos (back) and chorde (cord). It appears…

Ligament Definition Ligament is a sheet or band of tough fibrous tissue that connects two bones or holds an organ of the body in place.…

Intervertebral Disc Definition Intervertebral Disc is a broad disk of cartilage that separates adjacent vertebrae of the spine and acts as a shock absorber during…

Vertebra Definition Vertebra are divided into cervical, thoracic, and lumbar sections, and the sacrum and coccyx are both made up of a series of fused…

Thoracic Vertebrae Definition Thoracic Vertebrae are unique among the bones of the spine in that they are the only vertebrae that support ribs and have…