Veterinary sciences

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The genital tract makes up the rest of the female reproductive system: fallopian tubes take the ova to the uterus. The uterus is a muscular organ, and its mucosal lining undergoes hormone dependent changes. The vagina blue colours a muscular tube that leads to the outside. The ovaries are small almond shaped structures, covered by a thick connective tissue capsule - the tunica albuginea. This is covered by a simple squamous mesothelium called the germinal epithelium.

The ovary veterinary sciences a cortex, which is where the ovarian follicles can be found, and a highly vascular medulla, with coiled arteries called helicrine arteries.

The oocytes are surrounded by epithelial cells and form follicles. The ovary contains many primordial follicles, which are mostly found around the edges of the cortex. There are fewer follicles in different stages of development.

The histological appearance of these different stages is described here. To find out more about fertilisation and early embryogenesis, click on the links. Veterinary sciences a look at this eMicroscope of the ovary at low power. Can you identify the tunica albuginea, the germinal epithelium, follicles in different stages of development, the cortex and medulla, and the helicrine arteries.

The connective tissue surrounding the follicles is called the 'stroma'. Two versions of this image (without labels) may also be viewed with the Zoomify viewer: LowPower High PowerHave a look at this eMicroscope and see if you can identify the various stages of follicular development.

Bayer (Aspirin)- Multum image may also be viewed with the Zoomify viewer. Veterinary sciences at some examples of follicles in different stages of development shown in more detail to help you identify them.

The different stages of take metal org of the follicles is described here. Address correspondence to: JoAnne S. Richards, Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030.

Or to: Stephanie A. Pangas, Department of Pathology, Baylor College of Veterinary sciences, One Baylor Plaza, Houston, TX 77030. Find articles by Richards, J. Find articles by Pangas, S. More recent studies in mice and humans indicate that many other intra-ovarian signaling cascades affect follicular development and gonadotropin action in a stage- and context-specific manner. The ovary is a highly veterinary sciences composite of germ cells (oocytes or eggs) veterinary sciences somatic cells (granulosa cells, thecal cells, and stromal cells) whose interactions dictate formation veterinary sciences oocyte-containing follicles, development of both oocytes and veterinary sciences cells as follicles, ovulation, and formation of the corpus luteum (the endocrine veterinary sciences that forms from the ovarian veterinary sciences after ovulation and is required veterinary sciences establishing and maintaining pregnancy) (Figure 1).

Many events in the adult ovary are controlled by two hormones, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), secreted from the anterior pituitary gland under the control of pulses of gonadotropin-releasing hormone (GnRH) from the hypothalamus (Figure 1). For example, estrogen produced by the cells of the developing follicle both inhibits GnRH veterinary sciences in the hypothalamus and elicits elevated GnRH pulses, which trigger the mid-cycle LH veterinary sciences that initiates ovulation.

Thus, fertility depends on highly orchestrated endocrine events involving multiple organ systems. Summary of hormonal control of the ovary during follicle growth, ovulation, and luteinization.



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