Anatomical evidence for the epididymis as the prime mover in the evolution of the scrotum.
D000818:Animals; D005075:Biological Evolution; D001717:Birds; D004542:Ejaculation; D004822:Epididymis / Q000033:anatomy & histology* / Q000502:physiology; D006197:Hair; D006801:Humans; D008297:Male; D008322:Mammals; D051381:Rats; D012611:Scrotum / Q000033:anatomy & histology*; D013737:Testis / Q000033:anatomy & histology / Q000502:physiology