Dermis: The lower or inner layer of the two main layers of cells that make up the skin.The dermis contains blood vessels, lymph vessels, hair follicles, and glands that produce sweat, which helps regulate body temperature, and sebum, an oily substance that helps keep the skin from drying out. Sweat and sebum reach the skin’s surface through tiny openings in the skin that act as pores.
Dermoid: Also called a dermoid cyst of the ovary, this is a bizarre tumor, usually benign, in the ovary that typically contains a diversity of tissues including hair, teeth, bone, thyroid, etc. A dermoid cyst develops from a totipotential germ cell (a primary oocyte) that is retained within the egg sac (ovary). Being totipotential, that […]
- Dermoid cyst of the ovary
A bizarre tumor, usually benign, in the ovary that typically contains a diversity of tissues including hair, teeth, bone, thyroid, etc. A dermoid cyst develops from a totipotential germ cell (a primary oocyte) that is retained within the egg sac (ovary). Being totipotential, that cell can give rise to all orders of cells necessary to […]
DES: Diethylstilbestrol, the earliest synthetic (man-made) form of a hormone in the estrogen class. Diethylstilbestrol was once widely prescribed to prevent miscarriages and premature births. Its usage was standard practice in the 1950s and 1960s. Millions of women received the drug. Girls whose mothers were given Diethylstilbestrol during pregnancy (“DES daughters”) were discovered to be […]
- Descending aorta
Descending aorta: The descending aorta is the part of the aorta, the largest artery in the body, that runs down through the chest and the abdomen. The descending aorta starts after the arch of the aorta and ends by splitting into two great arteries (the common iliac arteries) that go to the legs. The descending […]
- Descending pathway
Descending pathway: A nerve pathway that goes down the spinal cord and allows the brain to control movement of the body below the head. In contrast, ascending pathways are nerve pathways that go upward from the spinal cord toward the brain carrying sensory information from the body to the brain.