For everyone crucifying this video in regards to the muscle comment; there IS smooth muscle in the corpus cavernosum. It's actually called corpus cavernosum muscle, or CCM. The following is taken from NCBI:
"Corpus cavernosum smooth muscle (CCSM) in the penis is unique in that it exhibits a high resting tone and, on stimulation, the muscle cells relax, allowing cavernous spaces to fill with blood, which results in an erection (tumescence). During detumescence, the muscle cells contract and return to the state of high resting tone".
Love your videos and use them for revision but just 1 issue with this 1, the penis isn't muscle, it contains erectile tissue - spongy and porous - which fills with blood -> erection. Sorry to be a stickler!
Your presentation is superior to many I have heard but I believe one part in inaccurate. Once the sperm mature during their epididymal travels and enters the the Vas Deferens it takes, depending upon frequency of ejaculation approximately 70 or so days to reach the Ampulla.
The ampulla and Vas act as a storage place with the Ampulla pushing sperm into the ejaculatory duct to mix with semen at the time of ejaculation.
seminal vesicles secrete seminal fluid (fructose, etc...) which is mixed with the sperm to THEN create semen. The prostate gland also contributes to the seminal fluid release and the process of creating semen.
Excellent video! but the drawing of the Sertoli cells is kind of misleading.. Sertoli cells are much much bigger and they extend from the basement membrane to the lumen and about 30-50 developing gametes are connected with one sertoli cell.
great drawings first off.. but first you mentioned that spermatozoa are immature, and then you say they then become mature and are called spermatozoa.. not sure how that makes sense. I learned in my Anatomy class that the term spermatozoa is indeed the mature sperm. Spermatid is the correct term for the immature sperm before they go through spermiogenesis
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