• Pseudostratified Columnar Epithelium – has a smooth luminal surface (unlike the “wavy” or “saw-toothed” appearance of the efferent ductules.

• Principal Cells – tall columnar cells (~75 to 80 µm) with numerous modified, long microvilli called stereocilia extend from their luminal surface.

• Basal Cells – small, round stem cells resting on the basement membrane.

• Muscular layer – gradually increases in thickness through the length of the duct.

• Head and Body – consists of smooth muscle.

• Spontaneous, rhythmic peristaltic contractions move sperm through the duct.

• Tail – consists of three layers (inner longitudinal, middle circular, and outer longitudinal) of smooth muscle.

• Neural stimulation induces contraction and forces sperm from the epididymis into the vas deferens.

• Stroma – the single, coiled duct is embedded in connective tissue.

Source: Epididymis | Male Reproductive System. (2022). Retrieved 16 May 2022, from https://histologyguide.com/slideview/MH-185-epididymis/19-slide-1.html