At birth the organs appropriate to each sex have developed and are in their adult positions but are not functioning. In both sexes the gonads go on to form the testes and ovaries; because they are derived from the same undeveloped structure, they are considered homologous organs. The external genitalia are completely formed by the end of the 12th week. A deep fascia, or sheet of connective tissue , surrounding the structures in the body of the penis is prolonged to form the suspensory ligament, which anchors the penis to the pelvic bones at the midpoint of the pubic arch. Vas deferens Epididymis continues as a muscular tube called vas deferens. At its lower end the tube is constricted to form a straight duct or tube that joins with the corresponding ductus deferens to form the ejaculatory duct. The inner part, attached to the bony margins of the pubic arch that part of the pelvis directly in front and at the base of the trunk , is called the root of the penis. There is some evidence that the ductules and the first portion of the duct of the epididymis remove excess fluid and extraneous debris from the testicular secretions entering these tubes. Hence the "fit" between human genitalia is a feature that has gradually evolved over eons, and had already been well developed even before mammals appeared much less people.
The vagina is attached to the uterus through the cervix , while the uterus is attached to the ovaries via the Fallopian tubes. Facial hair develops, as well as hair on the chest, abdomen, and limbs. Once the genetic sex has been determined, there normally follows a succession of changes that will result, finally, in the development of an adult male or female. The ductus deferens has a thick coat of smooth muscle that gives it a characteristic cordlike feel. Epididymis The seminiferous tubules unite to form a long coiled structure called epididymis. The duct enlarges and becomes thicker-walled at the lower end of the tail of the epididymis, where it becomes continuous with the ductus deferens. The differences between a male and a female are genetically determined by the chromosomes that each possesses in the nuclei of the cells. The structure of the tissue of the corpus spongiosum is similar to that of the corpora cavernosa, but there is more smooth muscle and elastic tissue. It measures about 4 cm across, 3 cm in height, and 2 cm front to back about 1. This structure attaches to the inferior portion of the testis and extends to the labial sacral fold of the same side at the same time, a portion of the embryonic mesonephric duct adjacent to the testis becomes attached and convoluted informs the epididymis. Hair at the temples recedes. Hormones produced by the ovaries prepare the uterus to receive the ovum. Each duct is about 2 cm about 0. Click here for my free Blossom Tips newsletter! Structures involved in the production and transport of semen. Paramesonephric duct At nine weeks, male differentiation of the gonads and the testes is well underway. Each spermatozoon is a slender elongated structure with a head, a neck, a middle piece, and a tail. Prostate cancer is almost exclusively confined to the outer zone. Till Sex Do Us Part: The raphe turns forward onto the undersurface of the penis and is continued back onto the perineum the area between the legs and as far back as the anus. As sexually reproducing organisms evolved into multicellular forms and their cells began to specialize, some cells began specializing for male and female reproductive function, both evolving at the same time, by small gradual steps. Below the skin is a layer of involuntary muscle, the dartos, which can alter the appearance of the scrotum. The oval bulb of the penis lies between the two crura and is covered by the bulbospongiosus muscle. It acts as the main store house of sperms. The urethra conducts both urine and sperms as per requirement.
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