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.
For example, because they are inside body cavities, the lungs, heart, stomach, intestines, urinary bladder, and many other organs can expand and contract without distorting surrounding tissues or disrupting the activities of nearby organs. The dorsal body cavity contains the brain and spinal cord. few organs, such as the kidneys and pancreas, lie between the peritoneal lining and the muscular wall of the abdominal cavity. Those organs are said to be retroperitoneal (retro, behind). The pelvic cavity is the portion of the ventral body cavity inferior to the abdominal cavity.