Search results
Results from the WOW.Com Content Network
Posthumous sperm retrieval (PSR) is a procedure in which spermatozoa are collected from the testes of a human corpse after brain death.There has been significant debate over the ethics and legality of the procedure, and on the legal rights of the child and surviving parent if the gametes are used for impregnation.
The sperm plasma then fuses with the egg's plasma membrane and their nuclei fuse, triggering the sperm head to disconnect from its flagellum as the egg travels down the fallopian tube to reach the uterus. In vitro fertilization (IVF) is a process by which egg cells are fertilized by sperm outside the womb, in vitro.
In humans, both of these organs are outside the abdominal cavity. Having the testicles outside the abdomen facilitates temperature regulation of the sperm, which require specific temperatures to survive about 2-3 °C less than the normal body temperature i.e. 37 °C.
Sperm outside the body generally has a ... Smoking cannabis can decrease sperm quantity. [10] Long-term ... clinic or a sperm bank. Some sperm does not survive the ...
Sperm production is controlled by follicle ... the testis will usually survive on these other blood ... (2.8–3.9 in) long, 4.5 cm (1.8 in) deep and 5 cm (2.0 in) in ...
The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell with 46 paired chromosomes. In mammals, sperm is stored in the epididymis and released through the penis in semen during ejaculation. The word sperm is derived from the Greek word σπέρμα, sperma, meaning "seed".
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
Consequently, the testes are located outside the body in a sac of skin called the scrotum. The optimal temperature is maintained at 2 °C ( man ) (8 °C mouse ) below body temperature. This is achieved by regulation of blood flow [ 20 ] and positioning towards and away from the heat of the body by the cremasteric muscle and the dartos smooth ...