Three-Dimensional Study of the Terminal Portion in Sprague-Dawley Rat Ejaculatory Ducts.
In mammals, a pair of ejaculatory ducts exists in the urethra at the seminal colliculus. The detailed anatomical structures of the distal end of the ejaculatory ducts of Sprague-Dawley rats were investigated by the computer-assisted three-dimensional reconstruction analysis using light-microscopic serial sections. A three-dimensional reconstruction revealed that in adult rats, the ejaculatory sinus pair consists of two parts: the cranial section - a compartment region composed of a fusion of the ampullary gland duct and the seminal vesicle duct, and the caudal section - a grooved region composed of a long slitlike ejaculatory ostium that extends into the urethra on both sides of the seminal colliculus. But the sphincter structure was not observed. The long axis of the compartment region was approximately 58 μm in length, and that of the groove region was approximately 495 μm. Although many epithelial glands ducts were distributed throughout the ejaculatory sinuses, the prostate and coagulation gland ducts did not open in these sinuses. The urethra was composed of transitional epithelium, while the ejaculatory sinuses were composed of single to stratified cuboidal epithelium. The ejaculatory ducts continued to the ejaculatory ostium in male adult Sprague-Dawley rat were composed of the seminal vesicle ducts received the ampullary gland ducts.
Department of Toxicology, Laboratory Animal Science, Animal Breeding, Genetics and Veterinary Anatomy, Azabu University School of Veterinary Medicine, Kanagawa, 252-5201, Japan.
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Motohashi
Department of Toxicology, Laboratory Animal Science, Animal Breeding, Genetics and Veterinary Anatomy, Azabu University School of Veterinary Medicine, Kanagawa, 252-5201, Japan.
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Inomata
Department of Pathology, the Jikei University School of Medicine, Tokyo, 105-8461, Japan.
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Takahashi
Department of Toxicology, Laboratory Animal Science, Animal Breeding, Genetics and Veterinary Anatomy, Azabu University School of Veterinary Medicine, Kanagawa, 252-5201, Japan.
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Ichihara
Department of Toxicology, Laboratory Animal Science, Animal Breeding, Genetics and Veterinary Anatomy, Azabu University School of Veterinary Medicine, Kanagawa, 252-5201, Japan.
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Kansaku
Department of Pathology, the Jikei University School of Medicine, Tokyo, 105-8461, Japan.
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Ikegami
Department of Toxicology, Laboratory Animal Science, Animal Breeding, Genetics and Veterinary Anatomy, Azabu University School of Veterinary Medicine, Kanagawa, 252-5201, Japan.
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Asari
Toxicololy and Pathology Research, SRICC, Sapporo, 004-0839, Japan.
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Mutou
Department of Toxicology, Laboratory Animal Science, Animal Breeding, Genetics and Veterinary Anatomy, Azabu University School of Veterinary Medicine, Kanagawa, 252-5201, Japan.
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Wakui
D000818:Animals; D004543:Ejaculatory Ducts / Q000033:anatomy & histology*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012669:Seminal Vesicles / Q000033:anatomy & histology*; D014521:Urethra / Q000033:anatomy & histology*