Ventral view, pelvic region, female

The probe to your right is inserted into the urethra of the female cat.  This is a different arrangement than is found in humans where the urethra and vagina exit at separate points.  In the cat the vagina and urethra join to form the vestibule, a common urogenital sinus.

Ventral view, pelvic region, male

The urethra of the male may be observed both cranial and caudal to the prostate.  In the above pictures the probe is pointing at the prostate.