A nervous reflex first causes the contraction of the vas deferens and related glands (seminal vesicle, prostate, Cowper's glands), which discharge their secretions (sperm cells and seminal fluid) into the urethra. The 2 to 5 millilitres of sperm thus accumulated are then propelled inside the penis by spasmodic contractions of the muscles of the perineum. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / QA International |
Bildgröße: | 5096 px × 3232 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |