A tubule is a very small tube or fistular structure.

In anatomy, a tubule is a minute tube lined with glandular epithelium.
..... Click the link for more information.

The testicle (from Latin testis, meaning "witness",^[1] plural testes) or ballock is the male generative gland in animals. This article will concentrate on mammalian testicles unless otherwise noted.
..... Click the link for more information.

wild rats. For pet rats, see Fancy rat. For other uses, see Rat (disambiguation).

Rats
Fossil range: Early Pleistocene – Recent



Scientific classification
..... Click the link for more information.

ovum (plural ova) is a haploid female reproductive cell or gamete. The word is derived from Latin, meaning egg or egg cell. Both animals and embryophytes have ova. The term ovule
..... Click the link for more information.

The term spermatid refers to the haploid male gametid that results from division of secondary spermatocytes. As a result of meiosis, each spermatid contains only half of the genetic material present in the original primary spermatocyte.
..... Click the link for more information.

A spermatozoon or spermatozoan (pl. spermatozoa), from the ancient Greek σπέρμα (seed) and ζῷον (living being) and more commonly known as a sperm cell
..... Click the link for more information.

Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed
..... Click the link for more information.

Male (♂) refers to the sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilisation.
..... Click the link for more information.

gametocyte is a eukaryotic germ cell that divides by mitosis into other gametocytes or by meiosis into gametes during gametogenesis. Male gametocytes are called spermatocytes, and female gametocytes are called oocytes.
..... Click the link for more information.

A spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa.

There are two subtypes:

Type A(d)
..... Click the link for more information.

Spermatogenesis is the process by which male spermatogonia develop into mature spermatozoa. Spermatozoa are the mature male gametes, in many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis.
..... Click the link for more information.

Editing of this page by unregistered or newly registered users is currently disabled due to vandalism.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or .
..... Click the link for more information.

meiosis (IPA: /maɪˈəʊsɪs/) is the process by which one diploid eukaryotic cell divides to generate four haploid cells often called gametes.
..... Click the link for more information.

S. scrofa

Binomial name
Sus scrofa
Linnaeus, 1758

The wild boar (Sus scrofa) is the wild ancestor of the domestic pig.
..... Click the link for more information.

Seminiferous tubules are located in the testicles, and are the specific location of meiosis, and the subsequent creation of gametes, namely spermatozoa.

The epithelium of the tubule consists of sustentacular or Sertoli cells, which are tall, columnar type cells that line
..... Click the link for more information.

The term spermatid refers to the haploid male gametid that results from division of secondary spermatocytes. As a result of meiosis, each spermatid contains only half of the genetic material present in the original primary spermatocyte.
..... Click the link for more information.

A spermatocyte is a male gametocyte which is derived from a spermatogonium. Initially in spermatogenesis, a spermatogonium divides by mitosis into two so-called primary spermatocytes.
..... Click the link for more information.

A spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa.

There are two subtypes:

Type A(d)
..... Click the link for more information.

A Sertoli cell (a kind of sustentacular cell) is a 'nurse' cell of the testes which is part of a seminiferous tubule.

It is activated by follicle-stimulating hormone, and has FSH-receptor on its membranes.
..... Click the link for more information.

Myofibroblast is a cell that is in between a fibroblast cell and a smooth muscle in differentiation.

Developmental origin

There are many possible ways of myofibroblast development:

1. Partial smooth muscle differentiation of a fibroblastic cell

..... Click the link for more information.

Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They can secrete testosterone and are often closely related to nerves. Leydig cells have round vesicular nuclei and a granular eosinophilic cytoplasm.
..... Click the link for more information.

Capillaries are the smallest of a body's blood vessels, measuring 5-10 μm, which connect arterioles and venules, and are
..... Click the link for more information.

human male reproductive system is a series of organs located outside of the body and around the pelvic region of a male that contribute towards the reproductive process.

The male contributes to reproduction by producing spermatozoa.
..... Click the link for more information.

The reproductive system is the ensembles and interactions of organs and/or substances within an organism that strictly pertain to reproduction. As an example, this would include in the case of female mammals, the hormone estrogen, ova, and the uterus and the vagina, and the breasts.
..... Click the link for more information.

In some male mammals, the scrotum is a protuberance of skin and muscle containing the testicles. It is an extension of the abdomen, and is located between the penis and anus.
..... Click the link for more information.

The dartos is a layer of smooth muscular fiber outside the external spermatic fascia but below the skin.

Gender differences

• In males it is termed tunica dartos and lies beneath the skin of the scrotum.

..... Click the link for more information.

The external spermatic fascia (intercrural or intercolumnar fascia) is a thin membrane, prolonged downward around the surface of the cord and testis. It is separated from the dartos tunic by loose areolar tissue.
..... Click the link for more information.

The cremaster muscle is a muscle that covers the testis.

Contraction

Its function is to raise and lower the scrotum in order to regulate the temperature of the testis and promote spermatogenesis.
..... Click the link for more information.

The internal spermatic fascia (infundibuliform fascia) is a thin layer, which loosely invests the cord; it is a continuation downward of the transversalis fascia.

Additional images

..... Click the link for more information.

The perineal raphe extends from the anus, through the mid-line of the scrotum (scrotal raphe) and upwards through the posterior mid-line aspect of the penis (penile raphe).

It is observed as a noticeable line.
..... Click the link for more information.