#embryology

[markscherz]

now accepting guesses as to what this embryo becomes when it matures

#evo-devo is a hell of a drug #zoology #animals #embryology #nature #evolution #can't post a source without giving it away so… sorry. #but the first author on the paper is named Gross #which is just #*chef's kiss*

[secularprolifeconspectus]

My friend is 9 weeks pregnant! Her embryo is 7 weeks gestation. We call them Frijole and in this video they roll over, suck their thumb and wiggle their toes. You can also see their heart thumping!

#pro life #anti abortion #embryology #biology #embryo #hide #victim imagery

[nemfrog]

Chicken embryo at 20 hours. Comparative embryology of the vertebrates. 1953.

Internet Archive

#textbook illustration #zoology #biology #embryology #chicken #chickens #diagram #science #nemfrog #1953 #1950s

[nochd]

This came across my dash via the #lgbt tag yesterday. I don't want to engage with the OP because that would get me into fights on radfem tumblr and I don't have the energy for that. But the post itself I think is worth answering, just because it's so neatly and exactly wrong.

(Not that my answer is going to spread very far, because I have 37 non-bot followers, of whom I think roughly 35.5 are just here for the nude photos. But anyway.)

Even if I agree just for argument's sake that the existence of intersex people proves that some people can have "nonbinary" sexes, or "third" sexes, and that "sex is a spectrum," how does that have any relevance to people who are not intersex? Like okay, let's "agree" for the moment that intersex people are something other than male or female. How does that make YOU, as a person who is not intersex, something other than male or female? Saying that intersex people's existence somehow makes sex "complicated" for you specifically is like saying that the issue of whether or not you can hear is "complicated" because some other people who are not you suffer from hearing loss or deafness. Like sorry but for 99% of the human population it is not "more complicated" than born with perfectly normal male genitalia = male and born with perfectly normal female genitalia = female, and chances are you fall into that 99%. Sex is not a social construct or a nebulous enigma of a concept. It is not debatable and made up in the manner that gender is. You cannot philosophize about whether there are two sexes any more than you can philosophize about whether humans have two kidneys. Someone having a missing or malformed kidney or accessory kidneys does not change the fact that humans as a species have two kidneys. Humans are gonochoric just like nearly all other animal species on Earth.

Let's start with the arithmetic. If 99% people are of binary sex, that leaves 1% of people who aren't. There are approximately 8 billion humans on Earth. 1% of 8 billion is 80 million -- about sixteen times the population of my entire country. Even just the number of intersex Americans is something like two-thirds the population of my country. This is not a negligible number of people.

There's a deeper error here, one that goes to the root not just of this misunderstanding but of many. Biology is always complicated, at every scale and at every level of explanation. It's messy, it's fuzzy, and it's always bottom-up, never top-down. Everything biological is the way it is because it grew that way. Biology never does the same thing twice.

Why does it seem like it does? Because, of all the ways you can arrange the parts of a living body, only an astonishingly tiny fraction of them actually make a living body. Any genetic mutation that nudges an organism outside of that fraction dies out and doesn't get passed on. Embryonic development is a gruelling tight-rope walk over a vast pit of non-existence.

Now for most of the body's systems, evolution has only had to produce one arrangement that works and survives. There's not an alternative plumbing plan where the oesophagus goes to the lungs and the trachea to the stomach. But for the reproductive system, evolution has to allow for two arrangements that work and survive, and it has to grow them both from the same starter kit.

What it does, therefore, is grow a body plan that works with a continuum of possible arrangements that includes both of those two. Various other points on the continuum may or may not be capable of producing viable gametes, but they're all survivable.

What biology doesn't do -- what biology never ever does -- is run new products on a conveyor belt stamping them into shape with cookie-cutters. The only things made that way are artificial constructs.

#science #biology #sex determination #evolution #embryology #lgbt #intersex #transgender #nonbinary #essentialism #biological essentialism #essentialism is not biological #biology is not friendly to transphobes

[o-craven-canto]

Embryophylogeny

(original picture here)

A map showing the derivation of various structures and tissues of the human body from the parts of the early embryo.

Human figure partly traced from this Wiki Commons image (public domain). Main source is TW Sadler, Langman's medical embryology (12th ed.), 2012.

#my work #infograph #anatomy #biology #embryology

[cheerfullycatholic]

#let them live #abortion #anti abortion #pro life #pro life quote #quote #embryology #science #human development

[noncompliantcyborg]

Let's Talk Sea Slugs: Rostanga pulchara

Rostanga pulchara is a small species of dorid nudibranch commonly found grazing on the red sponges that give it its color.

The adult below was 16mm long and 8mm wide, but they can grow to as large as 33mm long (Jensen et al 2018).

Above - Adult Rostanga pulchara collected from Cattle Point Intertidal, San Juan Island by Babonis Lab, Summer 2022.

Above - Closeups of Rostanga pulchara. Left - mantle showing the texture and shape of the tubercles. Center - gills. Right - rhinophore.

Along with size and color, a defining characteristic of the nudibranch is its uniquely shaped rhinophores (Jensen et al 2018). One is pictured above on the right.

A good way to find them in the wild is to look for the sponges that they eat. Two of these species are the velvety Clathria pennata and the "volcano-shaped" Acarnus erithacus (Jensen et al 2018). Both sponges are encrusting and highly pigmented.

The pigments from the sponge not only color the adult nudibranchs, but also their eggs (Jensen et al 2018). This can be seen in the early embryos below.

Above - Rostanga pulchara embryos, 2-cell and 4-cell stages. Viewed on 6/21/2022 under 40x magnification. The center 2-cell embryo was 111 microns across.

A week and a half later, these embryos had developed close to the point of hatching.

Unhatched veliger larvae, with visible shell anViewed on 7/1/2022 under 40X magnification. The center embryo measured at 125 microns across.

These nudibranchs, like many others, have a larval form called veligers. These veligers have shells and big ciliated lobes.

Hatched veliger larvae. Viewed on 7/7/2022 under 40X magnification.

Hatched veliger larvae from the same clutch of original eggs. Viewed on 7/13/2022 under 20X magnification. The larvae on the right was measured as 194 microns across the veler lobes and 178 micros from the top of the shell down to where the veler lobes exit the shell.

Sources:

Personal lab notes and obervations.

Jensen et al. Beneath Pacific Tides. MolaMarine, 2018.

All photographs by JA Fields, do not repost without express written permission.

*If you appreciate the work I do, you can support me through sharing my work, tipping me, or buying my art prints or embroidery.*

#science communication #marine biology #nudibranchs #sea slugs #developmental biology #larval biology #marine invertebrate #embryology #science #marine life #salish sea #sea creatures #my photography #my marine life photos #my sci-comm #my lab notes

[dreaminginthedeepsouth]

Eclipse over Stonehenge

* * * * 

"Before birth the embryo repeats physiologically the history of the species; after birth, according to Gurdjieff, we repeat the history of the planet; two centres are split off, objective conscience sinks, deserts appear, emotional deserts".

~ A.R. Orage

[h/t Ian Sanders]

#Ian Sanders #A.R.Orage #Stonehenge #Eclipse #quotes #embryology #history #history of the planet #deserts

[religion-is-a-mental-illness]

https://quranx.com/23.12-14

And certainly did We create man from an extract of clay. Then We placed him as a sperm-drop in a firm lodging. Then We made the sperm-drop into a clinging clot, and We made the clot into a lump [of flesh], and We made [from] the lump, bones, and We covered the bones with flesh; then We developed him into another creation. So blessed is Allah, the best of creators.

Allah doesn't know how babies are made. He thinks that babies come from sperm, that the woman is just "a firm lodging," has no idea bout the ova, and thinks that the baby grows from the inside out, with the bones developing before the flesh.

The celestial lord and creator of the entire universe has an understanding of embryology comparable to a ignorant seventh-century Arabian warlord. Funny that.

#islam #quran #embryology #embryo #scientific errors in the quran #religion #religion is a mental illness

[studzblr]

Save what can be saved: Day 21/48

Hey!

Remember when I said histology is the basis of medicine? Add embryology to that. You can't understand who you are if you don't know where you came from. Step by step.

#studzblr #studyblr #medicine #studying #study #study motivation #student #medblr #islamblr #lifeblr #sky #histology #embryology

[sitting-on-me-bum]

“Embryology”

On a moonlit night near the Yanayacu Research Station in northeastern Ecuador, a female Wiley’s glass frog (Nymphargus wileyi) hopped onto a fern and traversed one of its fronds, responding to the call of a waiting male. He mounted her back, prepared to hold on tight for several hours until she was ready to deposit her eggs. Finally, she positioned herself at the tip of a leafy arm that extended over a stream and pushed out a clutch of eggs, which the male immediately fertilized. Housed within a gelatinous mass that deters predators, protects against dehydration and prevents fungal infections, the embryos developed for a few days on the tip of the fern before dropping into the water to continue their metamorphosis.

by Jaime Culebras.

BigPicture Natural World Photography Contest

#jaime culebras #photographer #bigpicture natural world photography contest #yanayacu research station #ecuador #wiley's glass frog #frog #nymphargus wileyi #embryology #nature #macro photography

[schistostegapennata]

Y'all, I'm researching early modern embryology books and I've just got to share this illustration of shark fetuses from one of them. The anatomist apparently found a shark washed up on the coast near-ish to Padua where he taught at university, and went, "yes, must dissect. must commission illustration." And the result is wonderful.

Close ups of the little guys cause they're great!

#girolamo fabrici d'aquapendente #early modern period #early modern history #history of science #art history #embryology #de formato foetu #1600s art #shark #baby sharks #early modern Italy #history of medicine #anatomy #early modern anatomy

[energeticwarrior]

my brain rot is too strong rn i went on tumblr way too much over winter break for my own good bc

i knew this already but it makes me laugh that there's a protein called sonic hedgehog that shit never fails to make me laugh

Wnt canonical vs non-canonical pathway ? ok so is there a Wnt protein AU fanfic somewhere? headcanons for Wnt protein? /j

i love my program of study, this just made me laugh a lot lmao

#mine #nikkirambles #sonic hedgehog protein #shh protein #biology #anatomy and physiology #embryology

[nemfrog]

"Development of body form in pig embryo." Comparative embryology of the vertebrates. 1953.

Internet Archive

#biology #embryology #zoology #progession #diagram #pigs #nemfrog #1953 #1950s

[er-cryptid]

#studyblr #notes #medblr #medical notes #med notes #y chromosome #y chromosome notes #chromosomes #chromosome notes #development #embryology #embryology notes #genetics #genetics notes #notes on genetics #x chromosome #x chromosome notes

[o-craven-canto]

Been reading a couple books about human embryology and development (hence my latest infograph). It's an immensely fascinating and dare I say beautiful subject, but also quite terrifying as it dawns on you the sheer number and variety of ways it can go wrong.

Ectopic pregnancy, teratomes, dysostosis, omphalocele, gastroschisis, diaphragmatic hernia, ectopia cordis, hemangiosarcoma, esophageal and rectal atresia, spina bifida, meningocele, lissencephaly, hydrocephaly, anencephaly, cyclopia, disprosopus, hypertelorism, ichthyosis, epidermolysis, phocomelia, sirenomelia, syndactyly, monodactyly, craniopagus...

Some of these conditions are less than ideal, but are not much of threat. Others are just about immediately lethal. But for the ones in the middle, sometimes, it's amazing what people can manage to live with.

#biology #embryology #life is an scp #i don't recommend looking them up if you're sensitive to this sort of thing