According to the New York University Langone Medical Center, intervertebral discs are made up of "fibrocartilage tissue," which has two layers. While the inner portion resembles jelly, the outermost part has strong and f... More »

A slipped disc occurs when the soft inner portion of an intervertebral disc pushes against its own harder exterior portion, according to the American Academy of Orthopaedic Surgeons. In some cases, the soft middle comes ... More » Health Conditions & Diseases

Lumbar disc disease is a condition in which the intervertebral discs between vertebrae deteriorate and bulge out or rupture, according to Johns Hopkins Medicine. After rupture, fragments of disc material can press on ner... More » Health Conditions & Diseases

Pleural fluid prevents friction between the lungs and the chest cavity during respiration, and is found in a thin space between two layers of tissue. The tissues surrounding the lungs produce the fluid that rhythmically ... More »

Tissue tropism refers to the cells and tissue of a host organism that make the host hospitable to the growth of certain types of viruses and bacteria. While some bacteria and viruses can infect many types of cells and ti... More »

Biological evidence in forensic science includes organic materials, such as blood, semen, hair, saliva and skin tissue. Forensic scientists use fingernail scrapings and bone to identify victims and criminals. Biological ... More »

According to Genes & Development, a heterogeneous mass in biology is a tumor with both normal cells and neoplastic cells, which are cells of abnormal growth tissue. Heterogeneous masses are called solid tumors and can be... More »