Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

The Structure Of Cloaca And Hormonal Control Of Cloacal Glands’ Functıon In Male Trıturus Karelını (Amphıbıa: Urodela)

In this study, we aimed to examine the structure of cloaca and cloacal glands in the reproductive period of male newt, Triturus karelini, one of the example of urodel amphibians, and any effects of prolactin and testosterone hormones on cloacal glands of out of the reproductive period of individuals, at the light microscopical level with histological, histochemical and histometrical ways.

The cloaca of male individuals of Triturus karelini is composed of two main parts, the cloacal tube and the cloacal chamber. The cloacal tube is dorsal to the center of the cloacal chamber. The anterior part of the cloacal chamber is a widened cavity which is occupied with pseudopenis, a fibromuscular structure. The cloacal tube and cloacal chamber is coverged posteriorly through a dorsal groove, which is in a Y shape and cloacal chamber narrows gradually.

There are four different cloacal glands in the cloaca of male Triturus karelini. The glands are simple tubular glands in their morphology and they are named as pelvic glands, Kingsbury glands, ventral glands and dorsal glands. Pelvic glands and Kingsbury glands occur in dorsal and dorsolateral parts of the cloacal tube. Ventral glands surround all cloacal chamber. We could state that the first three cloacal glands are associated with formation of spermatophore. Dorsal glands pass from relatively anterior region such a pubic symphysis to the most posterior region of cloacal chamber. It is thought that these glands, occur between pelvic and ventral glands at the cloaca, may be related to pheromone production.

Prolactin, one of the hormones which we applied, has caused a decrease in activity of pelvic and dorsal glands, an increase in the secretion activity of ventral glands, and it did not cause any effects on Kingsbury glands. Testosterone, the second hormone which we applied, has no effects on dorsal and ventral glands. On the other hand, it has decreased the activity of pelvic glands, but has caused a increase in the activity of Kingsbury glands. The sensitivity of these glands is thought to be different according to their various responses to the same dose and duration of the hormone.

DALYAN Cem ,

Danışman : Yrd. Doç. Dr. Lütfiye ERYILMAZ

Anabilim dalı : Biyoloji

Program : Hidrobiyoloji

Yılı : 2006

Tez savunma Jürisi : Yrd. Doç. Dr. Lütfiye ERYILMAZ (Danışman)

Prof. Dr. Nurettin MERİÇ

Doç. Dr. Mustafa TEMEL

Doç. Dr. Ömer ALTUN

Doç. Dr. Hüsamettin BALKIS