crosngo.blogg.se - Frog ovary parts

#FROG OVARY PARTS FULL#

Right phylloxera – It is present in the middle dorsal position.There are three phylloxera found in the external genitalia External genitalia – Asymmetrical structures surround the male gonopore at the end of the abdomen.It opens by a separate aperture that appears near the male gonopore Its anterior portion lies in the sixth segment and is elongated posteriorly into a tubular structure. Phallic or conglobate – This is a long accessory gland.Utriculi majors are long, slender peripheral tubules filled with sperms Mushroom gland or Utricular gland – The junction of two vasa deferentia and ejaculatory ducts are surrounded by a complex mushroom gland consisting of utriculi majors and utriculi breviores.Ejaculatory duct – The ejaculatory duct is a single, median muscular duct that extends posteriorly and opens into the genital pouch through the male genital pore which lies beneath the anus.Vasa deferentia – Vasa deferentia comes one from each testis and runs posteriorly downwards to open into the ejaculatory duct through the seminal vesicle.The testis becomes non-functional and decreases in the old cockroach

#FROG OVARY PARTS FULL#

The testis appears to be well-developed in the young cockroach and full of sperms. Each testis is three-lobe and consists of about 30 to 40 small white transparent follicles arranged in the longitudinal series.

Testis – There is a pair of testis present in each dorsal lateral side of the four, five and six segments.

These are located in the abdominal part of the cockroach. The male reproductive system of cockroaches consists of the testis, phallic or conglobate gland, mushroom gland (utriculi majors and utriculi previous) vas deferens, ejaculatory duct, conglobate gland, male genital pore, genital pouch and gonapophysis or phallometric. The reproductive system of cockroaches is unisexual or dioecious.

Ovarian funnels – Ovarian funnels are present below the ovaries and connected to the oviduct, joined and opened as a single female genital pore located on the fourteenth segmentĬopulation – When two earthworms come and contact each other, mating takes place juxtaposing opposite gonadal openings and there is a transfer of sperm into other earthworms.

A pair of the small, white lobulated structure is attached at the inter-segmental septum of the twelfth and thirteenth segments Ovaries and Oviduct – The female reproductive system consists of the ovaries and oviduct.Seminal vesicles – Two pairs of seminal vesicles are located in the eleventh and twelfth segments where storage and maturation occur.They receive and store spermatozoa in the process of copulation Spermatheca – Earthworms have four pairs of spermatheca situated in the sixth to ninth segment, one pair in each segment respectively.Accessory Glands – Two pairs of accessory glands are located in the seventeenth and nineteenth segments respectively.Vasa deferentia – Two pairs of vasa deferentia are present and each extends from the periductal funnels and are connected to the prostatic duct.The testis is covered with the testis sac separately The testis is a minute, white globe-like structure located in each pair in the tenth and eleventh segments respectively. Testis – There are two pairs of testes.The male reproductive system consists of the testis, testis sac, seminal vesicles, vasa deferentia, prostate glands and accessory glands. The animal reproductive system has been explained here with the examples of earthworm, cockroach and frog.Įarthworms are bisexual or monoecious, that is, they have both male and female reproductive organs.Įarthworms are protandrous, which means that their testis matures before the ovary. In asexual reproduction, one parent duplicates itself to form a genetically matching offspring.Īnimals have a distinct reproductive system. In sexual reproduction, a new organism is created when the genetic information from two different sexes combine. There are two main types of reproduction – sexual and asexual reproduction. Reproduction is the process of offspring production.