Welcome to The Nonlinear Library, where we use Text-to-Speech software to convert the best writing from the Rationalist and EA communities into audio. This is: What it's like to dissect a cadaver, published by OldManNick on November 10, 2022 on LessWrong.
Why
I never thought I was a bio person. But then I overheard Viv talking about MAOIs at a party. I asked her:
> - What are MAOIs? > - monoamine oxidase inhibitor
> - What does that mean? > - It prevents reuptake of neurotransmitters. > - But what is a neurotransmitter? What does reuptake actually mean? > - ... > - So life uses chiral properties of space to implement things...
Viv had the most important trait of a teacher: patience. I asked the most naive questions and they answered them. They walked with me, all the way down to the very beginning, rebuilding my understanding. It was amazing. I wanted to know
more. Roadblock: finding lifeforms to study.
I wondered if non-medical students could watch dissections. You can’t get more information about an object than by directly interacting with it. The concrete world contains the abstract one. I even asked my doctor at a physical if she knew of any, and she said to look at community colleges.
After some searching, I found this: Bio
848NV. Forget viewing the dissection, you’re doing the dissection. 5 hour dissection for $60, free if you just watch. The only bureaucratic hangup is that you must pay by check.
This is why I love the Bay Area: there’s stuff like this and you can just do it. yes it’s weird no they can’t stop you. The boundary between scientist and serial killer is paper thin sometimes.
Takeaways
I’ve done this a few times now. Turns out that there’s way way way too much information to understand it all in one 5 hour session. Each time, we pick out areas and focus on them.
Seeing how everything fits together ‒and how big it is‒ makes understanding at different scales much easier.
There’s a common template to life. Seeing it in you hits different.
Brain has interesting connections to fractals and graph theory.
Maybe pan-psychism isn’t totally wrong.
What & how & why
I tell my friend Leah and she says “This is the most appealing activity that
I’ve ever seen you do”. Dunno whom that says more about.
We arrive and there are 5 people around 3 cadavers. We get aprons and lab coats and start syringing what’s mostly Downy fabric softener with a syringe. It prevents decay and smells sickly sweet.
Corpses can last a long time. One of the corpses had been dead for 5 years.
Many random observations
There’s a crazy amount of connective tissue, and it makes a creepy wireframe surrounding your skeleton. Even the space between the folds of the brain has it.
If you exercise, we’ll know. Their insides just look different. “It’s who you are inside that matters” is a much creepier sentence now.
Veins, arteries, and nerves all travel together, wound around each other by a bunch of connective tissue. Mnemonic: VAN.
Cancer can turn your guts and lungs green, and it’s this horrible bright moldy green. Metastasized tissue is hard but ultimately crumbly like overcooked chicken liver. The stomach and intestines have textures reminiscent of damp cardboard, but they’re dry to the touch.
I finally saw a lymph node. The body has a lot of drainage into the lymphatic system.
There’s a bunch of tiny nerves and you can’t feasibly preserve all.
The etymology of the word patience is “capacity for suffering”. This is apt. You can’t rush the process, and believe me, it is a process. Exposing the VANs requires reflecting away the skin, and this takes a long time and much more physical effort than you’d think. You’re basically scraping it off, and the best tool overall is your hands. Skin in particular is much tougher than it looks, and I ended up locking a pair of forceps against a shoulder and just leaning back to pull it taut.
Speaking of the shoulder, I spent 2 hours working up through one. There are a lot of fiddly bits. I knew, but didn’t understand, ...