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Additional info for 2008 Kaplan USMLE Step 1 Home Study Program-Brand New Volume II: General Principles Book 2

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8. Environmental chemicals, such as organic mercury present in fish from polluted waters or certain fungicides sprayed on grain, cause anomalies including neurologic symptoms resembling cerebral palsy and blindness. D. Hormones 1. , ethisterone and norethisterone) may produce various degrees of masculinization of the genitalia in female embryos, including: a. Clitoral hypertrophy b. Labial fusion c. Hypoplasia ofuterus and vagina in severe cases 4s ilitstical Congenital Abnormalities 2. Cortisone.

Splitting during later stages of development results in twins that also share an amnion. These often become entangled in their umbilical cords and die. 4. Incomplete splitting causes conjoined twins. Twins that share no major organ systems may be separated surgically. ifiB&ical ,t Body Cavities and Mesenteries Three potential cavities sunounded by serous membranes result from the partitioning of the embryonic coelom: pericardial, pleural, and peritoneal. When the continuity between the extra- and intraembryonic coelom is lost, the somatic mesoderm gives rise to the parietal layers of the serous membranes, and the splanchnic mesoderm gives rise to the visceral layers.

Two ectodermal invaginations, the nasal pits, divide this single mesenchymal prominence into two lateral and two medial nasal swellings. The lateral swellings become the sides of the nose. The medial swellings form the midpart of the 42 iliBticat Pharyngeal Arches and Their Derivatives nose, the midpart, or phi,ltrum, of the upper lip, the middle portion of the upper jaw and associated gingiva, and the primary palate. c. Maxillary processes move medially to form the lower border of the developing orbit and push the medial nasal processes to the midline.

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2008 Kaplan USMLE Step 1 Home Study Program-Brand New Volume II: General Principles Book 2 by by Kaplan


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