![]() ![]() The numbered bands specify the location of the thousands of genes that are present on each chromosome. For example, “chromosome 11p13” refers to band 13 on the short arm of chromosome 11. ![]() Chromosomes are further sub-divided into many bands that are numbered. ![]() Each chromosome has a short arm designated “p” and a long arm designated “q”. Males have one X and one Y chromosome, and females have two X chromosomes. Pairs of human chromosomes are numbered from 1 through 22, and the sex chromosomes are designated X and Y. Human body cells normally have 46 chromosomes. In other cases, some clinical researchers believe the disorder may be inherited as an autosomal dominant genetic trait.Ĭhromosomes, which are present in the nucleus of human cells, carry the genetic information for each individual. Some cases of Horner syndrome occur for no other apparent reason or unknown cause (idiopathically). The sympathetic nervous system (in conjunction with the parasympathetic nervous system) controls many of the involuntary functions of glands, organs, and other parts of the body. The lesion develops somewhere along the path from the eye to the region of the brain that controls the sympathetic nervous system (hypothalamus). In most cases, the physical findings associated with Horner syndrome develop due to an interruption of the sympathetic nerve supply to the eye due to a lesion or growth. Horner syndrome may result from any one of a variety of factors, including carotid artery dissection the development of a tumor in neck or chest cavity, particularly a neuroblastoma and a tumor of the upper part of the lung (Pancoast tumor) the development of a lesion in midbrain, brain stem, upper spinal cord, neck, or eye orbit inflammation or growths affecting the lymph nodes of the neck and/or surgery or other forms of trauma to the neck or upper spinal cord. 5 Myths About Orphan Drugs and the Orphan Drug Act.Information on Clinical Trials and Research Studies. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |