Internal vs external anal sphincter anatomy lesson! The internal anal sphincter (IAS) is an involuntary muscle while the external anal sphincter (EAS) is voluntary. The anorectal inhibitory reflex is where the IAS relaxes in response to rectal stretch via fecal matter, and then EAS pressure automatically increases. The brain can override this impulse by contracting the EAS to hold and store, which in turn facilitates the IAS to contract again. If the EAS is weak or has poor endurance/tone, this

This content provides a medically grounded overview of how repeated anal penetration can lead to microtrauma of the internal anal sphincter, emphasizing the importance of lubrication, gradual stretching, consent, and professional guidance to prevent long‑term sphincter dysfunction. #analhealth #sphinctercare #pelvicfloorrecovery #safesex #microtrauma | Уролог Олександр Наумчук

75K views · 639 reactions | Your external sphincter muscles run the risk of being stretched when you hold in your urine. #healthtips #bladder #pee | Insider Science | Facebook