Reproductive System of Earthworm
Earthworms are hermaphrodites animals that mean a body of earthworm consists of both male and female organs.
Male reproductive System of Earthworm.
Earthworm’s male reproductive system consists of two pairs of the testis, two pairs of spermiducal funnel, two pairs of seminal vesicles, two pairs of vasdefence, one pair of prostatic gland and one pair of the common prosthetic prostatic spermatic duct and one pair of male genital aperture.
(The singular form is Testis and the plural form is Testes)
Two pairs of testes are found in the intersegmental groove of the 10th and 11th segments. Testes are 8-1- tubular like structure containing sperm mother cell. These cells undergo meiotic division to produce sperms which are in an immature condition called Testisacs.
Testes sacs are the thin membranous structure which covers the two pairs of testes and two pair of seminal vesicles which is present in the 11th segment.
These spermatogonia are shed into the testes sac and enter into the seminal vesicles.
Two pairs of the seminal vesicle are found in the 11th and 12th segments on either side below each testis. Seminal vesicles contain nutritious secretion which helps to nourish the sperm.
Two pairs of Spermiduccal Funnel are found just below testis on either side in the same segment (10th and 11th). Spermiduccal Funnel receives matured sperm and passes down to vas deference.
Two pairs of Vas Differencia arise from each Spermiduccal Funnel which runs downwardly on either side and enters into the prostatic gland in the 18th segment.
These are irregular, flat, whitish bodies extending from 16th to 20th segments. Prostatic glands secrete alkaline secretion. It receives vas differencium and the sperm from Spermiduccal Funnel. The total content of the prostatic gland plus spermatic fluid is discharged through a common duct.
Common Prostatic Spermatic Duct
These are one pair of duct arising from the prostatic gland which opens into the male genital aperture in the 18th segment. Through this duct the male gamete along with prostatic secretion discharge out.
Male Genital Aperture
Male Genital Apperture are two openings in the ventral side in the 18th segment. Through these opening spermatic fluid is discharged