Template:Seminal Vesicle Timeline table

Seminal Vesicle Timeline

Week	Event
13	seminal vesicles appear as lateral evaginations or out-pocketings from the lower portion of the mesonephric ducts (Wolffian ducts). At this stage their lateral diameter is always greater than the anteroposterior length. (fetus CRL 80 mm)
14	sacculations or diverticula of the vesicles as evaginations of the walls of the vesicles. At this time three small but distinct sacculations may be counted at a given level in each vesicle. (fetus CRL 100 mm)
19	dilatation of the mesonephric ducts in their lower portion, to form the ampullae of the deferent ducts. Saceulations of the ampullae in the form of slight but definite irregularities of their lumina. Each vesicle at this stage shows from three to eight distinct sacculations at a given level. The lateral and antero—posterior diameters are now about equal.(fetus CRL 170 mm).
21	sacculations of the mesonephric ducts have become well developed and the dilatation of the ducts to form the ampullae have assumed very nearly their proportions at birth. (fetus CRL 180 mm)
25	vesicles and ampullae have assumed practically their adult form as regards their general topography and arrangement of sacculations. At a single level may be counted from~nine to twelve separate diverticula. (fetus CRL 220 mm)
25 to 31	prostatic utricle opens into the posterior urethra. At the latter date has a bifid lumen showing the union of two partially fused tubes. At this stage 5 to 7 distinct sacculations in each vesicle at a given level. (fetus CRL 220 to 275 mm)
Birth	vesicles show at a given level 7 distinct sacculations at one time. At this stage many of the diverticula are traversed by a network of fine trabeculae.
Data   Links: seminal vesicle | timeline