Category: H

The second branchial arch, which gives rise to the styloid process, the stylohyoid ligament, and the lesser cornu of the hyoid bone.  

In lower vertebrates, extensions from the lateral areas of the caudal vertebrae that fuse to enclose the caudal artery and vein. In humans these are represented by the costal processes of the vertebrae.  

Aphonia due to somatoform disorders. There is no organic defect.  

Any of the multiple antigens present on all nucleated cells in the body that identify the cells as “self.” Immune cells compare these antigens to foreign antigens, which do not match the “self’ and therefore trigger an immune response. These markers determine the compatibility of tissue for transplantation.  

The glycoprotein found on the surface of the hepatitis B viral envelope. It is the first marker of infection with the hepatitis B virus. If HBsAg is still found in blood samples 6 months after infection with the virus, chronic and potentially contagious infection with hepatitis B is present.  

A protein marker found on the core of the hepatitis B virus (HBV). HBV antigen does not circulate in the blood but is found only in fiver cells infected by HBV. HBcAg stimulates the production of a protective antibody, immunoglobulin M (IgM-anti-HBc), which appears in the blood shortly before the onset of symptoms. Tests for…

The original term for the Australian antigen, now called hepatitis B surface antigen (HBsAg). Its discovery made possible the differentiation of hepatitis B from other forms of viral hepatitis.  

Failure to ovulate as a result of excessive levels of male hormones. Polycystic ovary syndrome (Stein-Leventhal syndrome) is the most common form of hyperandrogenic anovulation.  

The position of the dental x-ray tube head in the horizontal plane. To avoid errors in x-ray interpretation, the central ray is directed perpendicular to the curve of the dental arch and film. Correct horizontal angulation produces a radiograph with “open” contacts. Incorrect horizontal angulation produces a radiograph with “overlapped” contacts.  

The angle formed by a line drawn through the triradiate and a line drawn through the physes of the femoral head. This angle is normally 25°. Coxa vara is marked by angles greater than 25°; coxa valga by angles less than 25°.