in addition to intraluminal secretion of the seminal vesicles and the ampulla of the vas deferens , ejaculated and ampullary spermatozoa revealed an intense immunoreaction , which was restricted to the neck region of the sperm head and the middle piece , while the principal piece of the tail as well as the sperm head were devoid of immunoreactive material .
C0037868
spermatozoa
C0037844
sperm head