Where is the testis on a fish?
In most bony fishes, testes are paired elongated organs that are attached to the dorsal wall of the body by a mesorchium. Histological examination of teleost testes, and also in all vertebrates, shows that the testes are formed of germ cells and somatic cells, comprising the germinal and interstitial compartments.
What is the histology of the testes?
The testis are ovoid organs responsible for sperm production (spermatogenesis). Tunica Albuginea – capsule of thick connective tissue . Seminiferous Tubules – each lobule contains 1 to 4 highly-coiled seminiferous tubules lined by a germinal epithelium that is the site of sperm production. …
Which cell are present between space of testes lobules in fish?
literature on cellular sources of testicular steroids in teleost fishes. Leydig cells or interstitial cells, the large polygonal cells usually located within the interlobular spaces, produce androgen (Guraya, 1976b; Hoar and Nagahama, 1978).
What is the structure of testis?
Testicles (testes) The testes are oval organs about the size of very large olives that lie in the scrotum, secured at either end by a structure called the spermatic cord. Most men have two testes. The testes are responsible for making testosterone, the primary male sex hormone, and for producing sperm.
What is fish reproduction called?
spawning
Fertilization is external in most fish species. Large quantities of eggs and sperm are simultaneously released into the water by females and males. This process of egg release is termed spawning..
What are parts of fish?
Parts of a Fish
- Caudal fin.
- Anal fin.
- Pelvic fin.
- Pectoral fin.
- Gill.
- Gill cover.
- Mouth.
- Eye.
What histology means?
Listen to pronunciation. (his-TAH-loh-jee) The study of tissues and cells under a microscope.
What are the covering of testis?
tunica albuginea
The tunica albuginea is the fibrous tissue covering of the testis. It is a dense blue-grey membrane, composed of bundles of white fibrous connective tissue, from which it derives its name albuginea, which interlace in every direction.
On which surface of testis epididymis is located?
The epididymis is found on the posterior surface of the testes, and sits along the entire length of the posterior testes.
What is the function of testes in fish?
As in other vertebrates, fish testes are organs of both gamete and hormone production.
What are the layers of testis?
There are three layers to the tunica, the tunica vasculosa, tunica albuginea and tunica vaginalis. The tunica vasculosa is the inner layer of the tunica and consists of blood vessels and connective tissue. It is covered by the tunica albuginea and facilitates blood supply to the testes.
What is the shape of male testis?
testicle (or testis) – small, oval-shaped sex gland that produces sex hormones and sperm. epididymis – a series of small tubes attached to the back of the testicle that collect and store sperm.
