The penis is the male sex organ, reaching its full size during puberty. Wake (15 September 1992). The SRY gene, usually located on the Y chromosome and encoding the testis determining factor, determines the direction of this differentiation. This area, however, does not become as enlarged as the other two during erection, for it contains more fibrous tissue and less space; unlike the corpora cavernosa, the corpus spongiosum has a constant blood flow during erection. The internal vasthouden organs are known as the secondary sex organs not in citation given 1 2 and are sometimes referred to as the internal genitalia. In general zoology, given the great variety in organs, physiologies, and behaviors involved in copulation, male genitalia are more strictly defined as "all male structures that are inserted in the female or that hold her near her gonopore during sperm transfer female genitalia are defined. Once the child is born, the parents are faced with decisions that are often difficult to make, such as whether or not to modify the genitalia, assign the child as male or female, or leave the genitalia. Thereafter, the development of the internal reproductive organs and the external genitalia is determined by hormones produced by certain fetal gonads (ovaries or testes) and the cells' response to them. There are sexual and asexual planaria. The other, hidden sex organs are referred to as the secondary sex organs or internal genitalia. How Erections Work, Ejaculation, and Penis Anatomy Image
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At birth or during early childhood, the foreskin may be removed by an operation called circumcision (.v. Excretory systems with analogous purpose in certain invertebrates are also sometimes referred to as cloacae. They also produce most of the primary hormones that affect sexual development, and regulate other sexual organs and sexually differentiated behaviors. Other animals edit In many other animals a single posterior orifice, called the cloaca, serves as the only opening for the reproductive, digestive, and urinary tracts (if present). More blood flows in and less flows out of the penis, hardening the tissue in the corpus cavernosum. Pollen is produced in stamens, and is carried to the pistil, which has the ovary at tiny its base where fertilization can take place. The absence of it allows the gonads to continue to develop into ovaries. Within each pollen grain is a male gametophyte which consists of only three cells. Each sexual organ in one sex has a homologous counterpart in the other one. Penis - Anatomy Pictures and Information - InnerBody
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Textbook of penis Anatomy and Physiology for Nurses. The cones and pollen are not themselves sexual organs. Sexual Selection and Animal Genitalia. In most flowering plants the female gametophyte within the ovule consists of only seven cells. In a larger perspective, the whole process of sexual differentiation also includes development of secondary sexual characteristics such as patterns of pubic and facial hair and female breasts that emerge at puberty.
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The corpora cavernosa are termed erectile tissue ( see erection because during sexual excitation, their fibrous tissue is expanded by blood that flows into and fills their empty spaces. 4 Coniferous plants likewise produce their sexually reproductive structures within the gametophytes contained within the cones and pollen. Thus there are no sex organs as such. Sexual planaria are hermaphrodites, possessing both testicles and ovaries. The external and visible organs, in males and females, are the primary sex organs known as the genitals or genitalia. Penis, the copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body. Any sex organs that are produced by the plant will develop on the gametophyte.