Female genital system of nematode

Female genital organs:

1. Two ovaries
2. Two oviduct (here fertilization of ovum takes place)
3. Two uterus (unite in receptaculum seminis)
4. receptaculum seminis
5. Vagina
6. Vulva:
1. vulva opens in various position on the ventral surface
2. Vulva may be covered by vulvar flap. e.g. Haemonchus sp

7. Oveiectors: It is a short muscular organ which is situated at the junction of uterus & vagina same species which assist in egg-laying.

Types of uterus: on the basis of arrangement:

1. Amphidelph: Both uterine tubes run to opposite direction from the vulva.
2. Prodelph: Both uteri running forward from vulva.
3. opisthodelph/postdelph: Both running backward.

Amphids & phasmids:

• A pair of depression occurring on the head end called amphids when placed at the posterior end called phasmid.
• These are chemoreceptor & are well supplied with nerve fibers & associated with glandular structures.
• On the basis of phasmides,   nematodes are classified as
• .Phasmidia
• Aphasmidia

Plaques & cordons:

They are plate and cord like ornamentations present on the cuticle of many nematodes of the superfamily Spiruroidea.