Comma-shaped structure, adhering to the testis at the top and to the rear. Composed of the canaliculi efferentes, the tubules which exit the testis near the top at the rear, the coni vasculosi or cone-shaped assemblies, each composed of single, convoluted ductuli efferentes which may be 4 to 6 cm in length and approx. 0.6mm in diameter, and the ductus epididymis, a tortuous, highly tangled tubule which may be as long as 6m in the adult human male. Considered to end in the ductus deferens, a tubule of about 45cm length.