This "instant delivery" problem causes many OBGYN doctors to stress the importance of women with a huge pelvis practicing pre-delivery vaginal stretching to avoid perineal injury. Such a large size for the female pelvis is present in less than one in a thousand adult women. When women reach their maximum pelvis size, often by 21 years of age, if they have a huge pelvis the resulting big hips will not go away—no matter how much they diet, as bone will not shrink. It is not unusual for such women, whose pear shape is due to a huge pelvis, to give up watching calories for smaller hips... leading to obesity. However, such pear shaped obese women do not necessarily have a huge pelvis and a measurement scan or anthropometry by calipers is required to diagnose the Justo Major condition. The incidence of Justo Major Pelvis is not found to be a strictly standard deviation type variation as it follows a tail skewed deviation to the right. Incidence varies with geographic regions of the world (e.g. Poland has a high incidence). Justo Major Pelvis is classified as congenital and thought to be partially inherited, especially from the maternal side. == References ==
The nematode excysts in the intestine, feeds, grows, mates, and releases eggs into the seawater in the hosts feces. As the gut of a marine mammal is functionally very similar to that of a human, Anisakis species are able to infect humans who eat raw or undercooked fish. Reproduction
Sexual reproduction occurs once the larvae have reached a definitive host and completed their final molt, at which point sexual organs are developed. Females are capable of producing 2.6 million eggs, depending on species and size at sexual maturity.The known diversity of the genus has increased greatly since mid-1980s with the advent of modern genetic techniques in species identification. Each final host species was discovered to have its own biochemically and genetically identifiable "sibling species" of Anisakis, which is reproductively isolated. This finding has allowed the proportion of different sibling species in a fish to be used as an indicator of population identity in fish stocks. Morphology
Anisakis share the common features of all nematodes: the vermiform body plan, round in cross section, and a lack of segmentation. The body cavity is reduced to a narrow pseudocoel. The mouth is located anteriorly and surrounded by projections used in feeding and sensation, with the anus slightly offset from the posterior. The squamous epithelium secretes a layered cuticle to protect the body from digestive acids. As with all parasites with a complex life cycle involving a number of hosts, details of the morphology vary depending on the host and life cycle stage.