liveonearth: (Default)
A human embryo starts out as three layers of tissue known as the ectoderm, mesoderm and endoderm. Most of us know, if we know anything about embryology at all, that the ectoderm becomes the nervous system and skin, the mesoderm becomes the bones and muscle, and the endoderm becomes the gut. But let's get more specific.

What layer originates the parenchyma of the tonsils and thymus?
Ectoderm? Mesoderm? or Endoderm??
Go ahead, guess. You have a one in three chance. )
liveonearth: (Default)
What does pituitary mean, from the Latin? (think onomatopoeia...)
to spit mucus
ptuo = to spit, pituita = mucus

What do you call a hormone that acts on neighboring cells?
paracrine

Are pituitary hormones steroid, steroid type, or peptide hormones?
peptide, all of them are

What do you call the loss of lateral visual fields?
bitemporal hemianopsia

Damage to what part of the pituitary causes diabetes insipidus, and which hormone is lacking?
self quiz from SSL's notes )
liveonearth: (Default)
The urogenital system develops from urogenital ridges of the intermediate MESODERM. First stage is pronephros. Next is mesonephros, in which primitive nephrons form and produce some urine (as early as 9 weeks gestation) which goes into the gut tube (cloaca) of the pre-human. The MESONEPHRIC DUCT becomes the ductus deferens. The metanephros is the final form of the kidney. It forms when the URETERIC BUD (aka metanephric diverticulum) branches out from the mesonephric duct and forms the collecting system (ureter, calyces, collecting tubules). It signals the surrounding mesenchyme to become the metanephric blastema, which blasts out the rest of the kidney including the rental tubules. Vascular cells migrate into the blastema and form glomeruli.
a little bit more including strange kidneys )
liveonearth: (Default)
I just ran across this article. I haven't really checked the science behind it, but what they are saying is that women with broader hips have fat stores of omega 3 fatty acids in their thighs and butts. Belly fat apparently is lower in omega 3's. The brain is built mostly of lipids. This article says that during child development, the brain of the fetus is built from the reserves of omega 3's that the mother has in her thighs. It says that a skinny pregnant woman can supplement omega 3 fatty acids, but that your body prefers to use stored lipids for building baby brains.

http://pmsol3.wordpress.com/2007/11/11/curvy-women-have-smarter-kids/
liveonearth: (Default)
QUIZ YOURSELF
1. What is the first major tissue of the limb to differentiate?
2. How do myotomal cells find their way from the somites to the limb to become muscle?
3. What kind of neurons are formed from neural crest cells?
4. What kind of cells migrate medially from the axis to form vertebrae and ribs?
5. What does AER stand for?
6. What (the heck) does the AER do and why?
answers and vocab )

Profile

liveonearth: (Default)
liveonearth

May 2025

S M T W T F S
    123
45678910
11121314151617
1819202122 2324
25262728293031

Syndicate

RSS Atom

Most Popular Tags

Style Credit

Expand Cut Tags

No cut tags
Page generated Jun. 6th, 2025 06:31 am
Powered by Dreamwidth Studios