| Certain amphibians have internal fertilization but no intromittent organs. |
| The intromittent organs of the male are remarkable for their complexity and elaboration. |
| Intromittent organ of male beneath sternum of the 1st somite of the opisthosoma. |
| Since amniote intromittent organs are hydrostatic, it follows that the wall of their erectile structures must be reinforced with inextensible fibers to prevent aneurysms. |
| Each male possesses two intromittent organs, one on either side of the body, only one of which is everted during a single copulation. |
| In general, intromittent organs are found in males and are used to inseminate females. |
