thevagina
The vagina is divided in to two parts i.e., vestibular, also known as the outer vagina, and posterior vagina (from the urethral opening to the cervix). Surface epithelium, muscular coat, and serosa make up the vaginal wall; mucosa is absent.
There is a thick layer of circular fibers and a thin layer of longitudinal fibers in the less developed muscular coat of the vagina. There are plenty of blood vessels, nerves, and both dense and loose connective tissue within the muscular coat. In addition to the posterior sphincter present in all animals, cows also have an anterior sphincter in their vagina. With the exception of a few mucous-secreting cells in cows, the vaginal epithelium is squamous and lacks glands. Changes in the vaginal epithelium occur in synchrony with the estrous cycle. During the luteal phase, it is low cuboidal and stratified squamous during estrus. Only the rat and bitch could have their various estrous cycle phases accurately detected using a vaginal smear; other animals could not. IgA and IgG antibodies are secreted by plasma cells situated beneath the epithelium, along with antisperm antibodies. These cells proliferate during the luteal phase to offer defense against invasive organisms. The female copulatory organ called the vagina is where semen is deposited. It provides spermatozoa to the cervical reservoir by acting as a semen reservoir. Vaginal distension is made possible by the muscles in the walls and the tiny ridges on the vaginal surface, which aid in parturition and mating. Sperm transport and psychosexual satiety are significantly influenced by the muscular contractions of the vaginal wall. The vagina absorbs seminal plasma. When absorbed in the vagina, certain components of seminal plasma affect the activity of other reproductive tract organs. The cervix and uterus’ excretory duct, is the vagina. The majority of the mucus secreted through the vagina - erroneously referred to as vaginal mucous - is generated within the cervix. The vagina receives fluids from the vascular supply even though it lacks secretory glands. These fluids, in conjunction with seminal plasma and cervical mucous, form a buffer system that adjusts the vagina’s normally unfavorable pH to promote sperm survival until they are transported. Insufficient cervical mucous, little vaginal fluid, or low ejaculate volume all result in insufficient buffering, which negatively impacts sperm survival. Bulls and dogs can detect the distinct scent of vaginal secretions in estrous cows. Sperm could be produced by the vagina, at least in rabbits. During parturition, the fetus passes through this portion of the birth canal.21.13
Source:
Rana Tanmoy (ed.). Principles of Veterinary Animal Physiology. CRC Press,2026. — 290 p.. 2026
More on the topic thevagina:
-
Veterinarian -