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anatomically these glands are placed at their widest at the base of the bladder, [10] [11] which is similar in location for the prostate in other mammals, histologic lining of the echidna urethra with transitional epithelium (Figures 1 & 2), and not post-prostate urethral lining of pseudostratified or stratified columnar epithelium observed in ...
Dissection of prostate showing the bulbourethral glands within the fibers of the external urethral sphincter just underneath the prostate. The bulbourethral glands are compound tubulo-alveolar glands, each approximately the size of a pea in humans. In chimpanzees, they are not visible during dissection, but can be found on microscopic ...
In some marsupial species, the size of the prostate gland changes seasonally. [64] The prostate is the only accessory gland that occurs in male dogs. [65] Dogs can produce in one hour as much prostatic fluid as a human can in a day. They excrete this fluid along with their urine to mark their territory. [66]
Marsupials give birth at a very early stage of development; after birth, newborn marsupials crawl up the bodies of their mothers and attach themselves to a teat, which is located on the underside of the mother, either inside a pouch called the marsupium, or open to the environment. Mothers often lick their fur to leave a trail of scent for the ...
The dusky antechinus was described by English naturalist George Robert Waterhouse in 1840, the second antechinus to be described. [3] It was named in honour of the zoologist and artist William Swainson, with the holotype likely being a specimen collected by Swainson's correspondent Thomas Lempriere from the Tasman Peninsula in Tasmania.
The shape of the glans varies among different marsupial species. [73] [74] [75] In most marsupials, the glans is divided, but male macropods have an undivided glans penis. [5] The glans penis is also divided into two parts in platypuses and echidnas. [76] [77] Males of Racey's pipistrelle bat have a narrow, egg-shaped glans penis. [78]
The vas deferens loops over the ureter in placental mammals, but not in marsupial mammals. [22] [23] In cartilaginous fishes, the part of the archinephric duct closest to the testis is coiled up to form an epididymis. Below this are a number of small glands secreting components of the seminal fluid.
The anal glands or anal sacs are small glands near the anus in many mammals. [1] They are situated in between the external anal sphincter muscle and internal anal sphincter muscle. [2]