Category: S

One of the four parts that fuse during development to form the body of the sternum.  

Describing an optical device consisting of an opaque disk punctured with a fine slit or hole (or holes), which is placed in front of the eye in the same position as glasses and enables sharper vision in cases of gross far- or nearsightedness or astigmatism. It reduces distortion in the image formed on the retina…

Apparent widening of the distance between the upper and lower eyelids (the palpebral fissure) due to retraction of the upper lid and protrusion of the eyeball. It is a sign of exophthalmic goiter.  

The reflex maintenance of muscular tone for posture. A reflex concerned with establishing and maintaining posture when the body is at rest.  

A synthetic male sex hormone with anabolic activity, used to treat wasting diseases, such as osteoporosis and anorexia, and breast cancer. It is administered by mouth.  

An unsaturated hydrocarbon (a terpene), synthesized in the body, from which cholesterol is derived. An unsaturated carbohydrate present in shark-liver oil and some vegetable oils. It is an intermediate in the biosynthesis of cholesterol.  

The formation of sporozoites during the life cycle of a sporozoan. The contents of the zygote, formed by the fusion of sex cells, divide repeatedly and eventually release a number of sporozoites.  

The second-stage larva of a parasitic fluke, found within the tissues of a freshwater snail. A sporocyst develops from a first stage larva and gives rise either to the next larval stage or daughter sporocysts. The latter develop directly into the final larval stage without the intermediate redia stage. Any sac containing spores or reproductive…

Surgical fusion of the intervertebral joints of the backbone. Surgical formation of an ankylosis between vertebrae. A surgical procedure in which vertebrae are fused together.  

The thickest part of the corpus callosum, rounded and protruding backward over the thalami, the pineal body, and the midbrain.