The phrase genetic engineering, unfortunately, often conjures up images of macabre experiments resulting in Frankenstein-like monsters and the cold-hearted use of genetic information to create new social classes depending on our genes, as in the 1997 film Gattaca.2} However, genetic engineering can simply be defined as the manipulation or alteration of the genetic structure of a single cell or organism.
Medullary cavity. From Wikipedia, the free encyclopedia. The medullary cavity (medulla, innermost part) is the central cavity of bone shafts where red bone marrow and/or yellow bone marrow (adipose tissue) is stored; hence, the medullary cavity is also known as the marrow cavity.owever, the medullary cavity is the area inside any bone (long, flat, etc.) that holds the bone marrow.
Fig 1.0 â The structure of the peritoneum and the peritoneal cavity. Note how the visceral layer invaginates to cover the organs. The peritoneal cavity is a potential space between the parietal and visceral peritoneum.It contains only a thin film of peritoneal fluid, which consists of water, electrolytes, leukocytes and antibodies. The fluid serves two main functions: 1  It acts as a lubricant, enabling free movement of the abdominal viscera.he peritoneal cavity is not completely closed in females. The abdominal ostia of the uterine tubes opens into the peritoneal cavity providing a potential pathway between the female genital tract and the peritoneum.