By Thomas W. Sadler PhD
Langman's clinical Embryology covers embryology for clinical, nursing, and healthiness professions scholars with a robust medical emphasis. The textual content is very valued as a educating and studying source for its medical correlation packing containers, summaries, difficulties to resolve, illustrations and medical pictures, and transparent, concise writing style—all of which make the subject material available to scholars and proper to teachers. on-line fabric contains Simbryo—an animation application displaying techniques, organs, and platforms constructing in human embryos—as good as evaluate questions and entire textual content on-line. A separate school picture financial institution and PowerPoint shows also are to be had.
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Additional info for Langman's Medical Embryology, 12th Edition
Oogonia are grouped in clusters in the cortical part of the ovary. Some show mitosis; others have differentiated into primary oocytes and entered prophase of the first meiotic division. Almost all oogonia are transformed into primary oocytes in prophase of the first meiotic division. C. There are no oogonia. Each primary oocyte is surrounded by a single layer of follicular cells, forming the primordial follicle. Oocytes have entered the diplotene stage of prophase, in which they remain until just before ovulation.
4). Spermatozoa may remain viable in the female reproductive tract for several days. Only 1% of sperm deposited in the vagina enter the cervix, where they may survive for many hours. Movement of sperm from the cervix to the uterine tube occurs by muscular contractions of the uterus and uterine tube and very little by their own propulsion. The trip from cervix to oviduct can occur as rapidly as 30 minutes or as slow as 6 days. After reaching the isthmus, sperm become less motile and cease their migration.
Spermatids go through a series of changes (spermiogenesis) (Fig. 24), including (1) formation of the acrosome; (2) condensation of the nucleus; (3) formation of neck, middle piece, and tail; and (4) shedding of most of the cytoplasm. The time required for a spermatogonium to become a mature spermatozoon is approximately 74 days. Problems to Solve 1. What is the most common cause of abnormal chromosome number? Give an example of a clinical syndrome involving abnormal numbers of chromosomes. 2. In addition to numerical abnormalities, what types of chromosomal alterations occur?