Ovarian structures and litter size in the Mexican Vole, Microtus Mexicanus

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Laurentian University, Department of Biology , Sudbury, Ont
Statementby Diane Drouin.
The Physical Object
Paginationvi, 19 l. :
ID Numbers
Open LibraryOL20063310M

Litter size and mean neonate size increased with maternal body length; however, the relative clutch mass did not vary with female size. The mean litter size was neonates (range 3–15), and the. Nongeographic variation in 23 external and cranial characters was assessed for Microtus mexicanus.

Univariate and multivariate statistical analyses were used to assess variation because of age and. Microtus californicus (Peale, ) is a cricetid commonly called the California vole or California meadow mouse.

A sexually dimorphic, medium-sized vole, M. californicus is 1 of 62 species in the genus Microtus. It is found in the interior valleys of southwestern Oregon, most of California, and northern Baja California, Mexico.

californicus is found in a wide range of habitats from arid Cited by: pine vole (Microtus quasiater), an endem ic rodent from Mexico. During 3 annual cycles, feces were collected on a mont hly basis from a popula tion locat ed in a mountain cloud forest at Apulco.

Mexican voles, Microtus mexicanus, were trapped near Flagstaff, Arizona, during and Specimens were dissected, the reproductive organs were examined, and. Clinical studies have reported associations between ovarian stromal hyperplasia and the diagnosis of hormonally related tumors such as endometrial cancer.

To assess the hypothesis that characteristics of benign ovaries among postmenopausal women are related to risk for breast, endometrial, and colon cancer, we analyzed systematically collected transvaginal ultrasound data for participants.

(arrowed) was reduced in size (xl-7 cm) and intra-ovarian cysts' were suppressed both in size and number. Breast development hid regressed to Tanner stage signs of their pubertal development. Thechange in pubertal status correlated with a decrease in ovarian size and regression of the megalocystic ovarian appearance (Fig.

Case. - ovarian follicles - deep in tunica albuginea - houses: growing oocyte, functional corpus luteum, corpora albicantia. ovarian medulla structure that forms immediately after ovulation - result of the protrusion of tissue and rupture of blood vessels; Subjects. Arts and Humanities.

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Languages. Math. • A large multimeric protein synthesized primarily in the fat body and transported to the ovary in the blood (~ kDa). • Most insects have a vitellogenin that is composed of both large and small subunits (~kDa and ~kDa).

Vaginal smear patterns and studies of ovarian structure, before and after coitus, show the short-tailed field vole, Microtus agrestis (Austin, ; Chitty & Austin, ; Clarke & Kennedy,   Table shows details on spontaneous vs.

induced ovulators including their social systems. While a full phylogenetic analysis is beyond the scope of this paper, there are several clear patterns.

First of all, some taxa include all spontaneous or all induced ovulators (e.g., Microtus).In the case of Microtus, all species are induced ovulators but some have extremely divergent social systems. The female gonads are called the ovaries.

In this article, we will initially look at the basic function, location, components and clinical significance of the ovaries. The latter part of the article will cover the ligaments associated with the ovaries and their vasculature, lymphatic drainage and innervation.

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An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk.

Software. An illustration of two photographs. Full text of "Voles (Microtinae)". The meadow vole (Microtus pennsylvanicus), sometimes called the field mouse or meadow mouse, is a North American vole found across Canada, Alaska and the northern United range extends farther south along the Atlantic coast.

One subspecies, the Florida salt marsh vole (M. dukecampbelli), is found in Florida, and is classified as endangered. ovarian germ cell tumors are benign, but some are cancerous and may be life threatening. Less than 2% of ovarian cancers are germ cell tumors.

Overall, they have a good outlook, with more than 9 out of 10 patients surviving at least 5 years after diagnosis. There are several subtypes of germ cell tumors. The litter size varies for different species, depending on annual weather conditions, from one (subspecies oiAlticola) to six or even seven (Microtus arvalis), and the young animals of the first, and sometimes second litters, reproduce in the year of their birth.

which in eastern Mexico consists of the Mexican vole (subgenus Microtus s. str. Population cycles in voles and lemmings are accompanied by a series of changes. A few of them include fluctuations occurring in a variety of genera and species from arctic to temperate areas, from Mediterranean to continental climates, from snowy areas to snow-free areas.

Populations living in a wide variety of plant communities in a small. An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Software.

An illustration of two photographs. Full text of "Biology of New World Microtus". Structures located in the medulla of the ovary. blood vessels, lymphatic vessels, & nerve fibers.

Primary oocytes present in a female infant at birth. approx. What makes up an ovarian follicle. A developing oocyte surrounded by one or more layers of follicular cells.

Ovary, in zoology, female reproductive organ in which sex cells (eggs, or ova) are usually paired ovaries of female vertebrates produce both the sex cells and the hormones necessary for reproduction.

In some invertebrate groups, such as coelenterates (), formation of ovaries is associated with the invertebrates have both ovaries and testes in one animal, and some. The water vole (Microtus richardsoni) is the largest North American is found in the northwestern United States and southern parts of western animal has been historically considered a member of genus Arvicola, but molecular evidence demonstrates that it is more closely related to North American Microtus species.

Water voles are on the USDA Forest Service Region 2 sensitive. The transvaginal sonogram in the slide shows a simple ovarian cyst. Ovarian cysts identified on US can be divided into two main types: simple and complex.

On US, a simple ovarian cyst has a rounded shape and a uniformly thin wall. It is unilocular, hypoechoic or anechoic, and usually cm in diameter.

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The World Health Organization Histological Classification for ovarian tumors separates ovarian neoplasms according to the most probable tissue of origin: surface epithelial (65%), germ cell (15%), sex cord-stromal (10%), metastases (5%), miscellaneous. This banner text can have markup.

web; books; video; audio; software; images; Toggle navigation. J -- A new study from the U.K. suggests that the size of a woman's ovaries may be a better predictor than age of when her biological clock will.

Ovarian follicle growth can be divided into previtellogenic (primary growth) and vitellogenic (secondary growth) stages, during which the major lipid and protein nutrients required for embryonic and larval development are stored within the oocyte (Fig.

1).During previtellogenesis, oocytes begin accumulating neutral lipids, which are stored as lipid droplets in the ooplasm. Three ovarian structures in cattle may include the term "cyst": follicular cysts, luteal cysts, and cystic corpus luteum (CL). However, in contrast to the other two, the structure sometimes described as a cystic CL (a CL with a cavity or "lacunae") actually arises after normal ovulation.

CL with a lacunae are a normal stage or variation of CL. Start studying Ovary: structure and function. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

by uterine size, ovarian size, degree of filling of the urinary bladder, degree of distention of the rectosigmoid colon, and the presence of a pelvic mass (3). However, because the mesovarium an-chors the ovary to the posterior layer of the broad ligament, the normal ovary is generally located in the posterior pelvic compartment or above the.

Structure. The ovaries are considered the female gonads. Each ovary is whitish in color and located alongside the lateral wall of the uterus in a region called the ovarian ovarian fossa is the region that is bounded by the external iliac artery and in front of the ureter and the internal iliac area is about 4 cm x 3 cm x 2 cm in size.

Ovarian atrophy occurs with increasing age or as result of exposure to radiation or chemicals that damage oocytes. Ovarian atrophy is most easily recognized when it has reached an advanced stage such as after chronic dosing or at the end of reproductive senescence (Figure ).Ovarian atrophy in short-term studies can be difficult to identify due to the presence of multiple .Suckling Behavior of Prairie Voles (Microtus ochrogaster) Betty McGuire.

Journal of Mammalogy, Vol Issue 4, Geographic Range of the Endangered Mexican Prairie Dog (Cynomys mexicanus) Julián Treviño-Villarreal, William E. Grant. Journal of Mammalogy, Vol A question of size and fear: competition and predation risk.This review considers the behavioral, ecological, and reproductive characteristics of mammals exhibiting monogamy, i.e., mating exclusivity.

From a discussion of the life histories of selected species of monogamous primates, carnivores, rodents and ungulates, several trends emerge.