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Females reach sexual maturity (puberty) between 8 and 18 months of age. There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. [ 5 ] 1. Proestrus, in which eggs in the ovaries begin to mature and estrogen levels begin to rise, is the first stage of the reproductive cycle.
Tunica vaginalis. Diagram of a cross-section of a testicle. 1. Cavity of tunica vaginalis, 2. Visceral lamina, 3. Parietal lamina. The right testis, exposed by laying open the tunica vaginalis. (Tunica vaginalis is labeled at upper right.) The tunica vaginalis is a pouch of [2] serous membrane [3] within the scrotum that lines the testis and ...
The human reproductive system usually involves internal fertilization by sexual intercourse. During this process, the male inserts their erect penis into the female 's vagina and ejaculates semen, which contains sperm. The sperm then travels through the vagina and cervix into the uterus or fallopian tubes for fertilization of the ovum.
Canidae (/ ˈkænɪdiː /; [ 3 ] from Latin, canis, " dog ") is a biological family of dog-like carnivorans, colloquially referred to as dogs, and constitutes a clade. A member of this family is also called a canid (/ ˈkeɪnɪd /). [ 4 ] The family includes three subfamilies: the Caninae, and the extinct Borophaginae and Hesperocyoninae. [ 5 ]
The dog's footpad is a fatty tissue locomotive-supporting organ, present at the bottom of the four legs, consisting of digital pads, a metacarpal pad, and a carpal pad, with dewclaw near the footpad. [26] When a dog's footpad is exposed to the cold, heat loss is prevented by an adaptation of the blood system that recirculates heat back into the ...
Anatomical terminology. [edit on Wikidata] The bulbourethral glands or Cowper's glands (named for English anatomist William Cowper) are two small exocrine and accessory glands in the reproductive system of many male mammals. [1] They are homologous to Bartholin's glands in females. The bulbourethral glands are responsible for producing a pre ...
The embryonic and prenatal development of the male reproductive system is the process whereby the reproductive organs grow, mature and are established. It begins with a single fertilized egg and culminates 38 weeks later with the birth of a male child. It is a part of the stages of sexual differentiation.
Granulosa cell. Pig oocyte surrounded by granulosa cells. Fluorescence microscopy, colored with DAPI. A granulosa cell or follicular cell is a somatic cell of the sex cord that is closely associated with the developing female gamete (called an oocyte or egg) in the ovary of mammals.