Epididymis Caput Corpus Cauda Lumen diameter Minimum Maximum 160.29 ± 39.27 295.45 ± 115.90 159.6 ± 25.3 348.7 ± 93.8 167. ± 19.7 286.5 ± 100.2 Epitheliumheight 30.2 ± 6.5 36.1 ± 5.9 20.3 ± 5 Number of smoothmuscle cell layers 1-None 1-2 4-9

Table 4: Measurements of the epididymis including minimum and maximum diameters of the three segments, epithelium height and smooth muscle cell layers. Measurements are in micrometers.