BIO* - Biology BIO* M121 Lecture Notes - Lecture 20: Callosobruchus Maculatus, Vas Deferens, Ejaculatory Duct
9 Jun 2020
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Document Summary
Many aspects of fertilization and egg-laying vary among species. The embryo completes most of its development in an egg laid into the environment (sea urchins, most insects) The embryo develops entirely in the mother"s body (most mammals) Offspring develop in the mother"s body but are nourished by yolk stored. Male reproductive systems in the egg (sharks) In humans the scrotum holds the testes, while the penis functions as the organ of copulation for internal fertilization. The testes are located in the abdominal cavity. Male genitalia shape and size may affect sperm competition. Impacts reproductive success in some insects and spiders. The human male reproductive organs carry out three major functions: Sperm is produced in the testes and stored in the epididymis. Complex solutions form in the seminal vesicles, prostate gland, and bulbourethral gland. The vas deferens transports sperm from the epididymis to the ejaculatory duct. The composition of accessory fluids varies widely among animals.
