Abnormal male internal genitalia morphology Abnormal seminal vesicle morphology 2024-01-25T09:04:06Z A structural abnormality of the seminal vesicle. The seminal vesicles are a pair of glands that also include the prostate gland and the bulbourethral glands and are located in the pelvis superior to the rectum, inferior to the fundus of the bladder and posterior to the prostate. The seminal vesicles contribute around 70% of the fluid that will eventually become semen.