Sperm duct wikipedia

Whitman the entire nephridial system in the leech Clepsine is formed by the differentiation of a continuous epiblastic band on each side. In the majority of the Megascolicidae each sac is provided with one or more diverticula, tubular or oval in form, of a slightly different histological character in the lining epithelium, and in them is invariably lodged the sperm. It is important to be aware of the breathing rhythm at all stages during Tantric practice, and to be able to modify breathing patterns, using them to shift energy. Among the purely aquatic families such structures are very rare, and are represented by two caeca in the genus Limnodriloides. In the leeches, however, there seems to be the commencement of the formation of a syncerebrum.
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seminal duct

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Anatomy and Physiology of Animals/Reproductive System

Gonads not so restricted in position as in Oligochaets, and often more abundant; the individuals usually unisexual. The plan of the central nervous system is therefore that of the Arthropoda. There are, however, in the Eudrilidae , as already mentioned, sacs envolving the ovaries which bore their own way to the exterior, and thus may be termed coelomoducts. Branch of the abdominal aorta. In the latter case, the numerous bands of muscle attaching the pharynx to the parietes have obliterated the regular partition by means of septa.
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Vas deferens - Wikipedia

This is also a site to store sperm, nourishing them until the next ejaculation. Beddard the funnels of the pronephridia disappear except in the genital segments, where they seem to be actually converted into the genital funnels. These are formed in large numbers around the time of birth and start to develop after the animal becomes sexually mature. The main trunks of the vascular system often possess valves at the origin of branches which regulate the direction of the blood flow. If the genital funnels are not wholly or partly formed out of the nephridial funnels they have replaced them. The penis continues to grow until about 18 years of age, reaching an average adult size of about cm.
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Paired setae of Oligochaetous pattern present in anterior segments. Ejaculatory duct obstruction EDO Ejaculatory duct obstruction EDO is a congenital or acquired pathological condition which is characterized by the obstruction of one or both ejaculatory ducts. However, most birds make do with a small amount of erectile tissue known as a papilla. It can also be done by detecting the hormones progesterone or equine chorionic gonagotrophin eCG in the urine. Some have spines, warts or hooks on them to help keep them in the vagina and copulation may be extended to help retain the semen in the female system. Quite independent of these are certain large dorsally situate funnel-like folds of the coelomic epithelium, ciliated, but of which no duct has been discovered leading to the exterior.
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