Endoderm
Endoderm is one of the three primary germ layers in the very early human embryo. The other two layers are the ectoderm (outside layer) and mesoderm (middle layer), with the endoderm being the innermost layer. Cells migrating inward along the archenteron form the inner layer of the gastrula, which develops into the endoderm.
The endoderm consists at first of flattened cells, which subsequently become columnar. It forms the epithelial lining of multiple systems.
Production
The following chart shows the products produced by the endoderm. The embryonic endoderm develops into the interior linings of two tubes in the body, the digestive and respiratory tube.
Liver and pancreas cells are believed to derive from a common precursor.
In humans,the endoderm can differentiate into distinguishable organs after 5 weeks of embryonic development.
Additional images
Section through the embryo.
Section through the embryo.
Section through ovum imbedded in the uterine decidua
Section through ovum imbedded in the uterine decidua
Podcasts:
End
by: R.E.M.It's The End Of The World As We Know It lyrics
That's great, it starts with an earthquake, birds and
snakes, an aeroplane and Lenny Bruce is not afraid.
Eye of a hurricane, listen to yourself churn - world
serves its own needs, dummy serve your own needs. Feed
it off an aux speak, grunt, no, strength, Ladder
start to clatter with fear fight down height. Wire
in a fire, representing seven games, a government
for hire and a combat site. Left of west and coming in
a hurry with the furies breathing down your neck. Team
by team reporters baffled, trumped, tethered cropped.
Look at that low playing! Fine, then. Uh oh,
overflow, population, common food, but it'll do. Save
yourself, serve yourself. World serves its own needs,
listen to your heart bleed dummy with the rapture and
the revered and the right, right. You vitriolic,
patriotic, slam, fight, bright light, feeling pretty
psyched.
It's the end of the world as we know it.
It's the end of the world as we know it.
It's the end of the world as we know it and I feel fine.
Six o'clock - TV hour. Don't get caught in foreign
towers. Slash and burn, return, listen to yourself
churn. Locking in, uniforming, book burning, blood
letting. Every motive escalate. Automotive incinerate.
Light a candle, light a votive. Step down, step down.
Watch your heel crush, crushed, uh-oh, this means no
fear cavalier. Renegade steer clear! A tournament,
tournament, a tournament of lies. Offer me solutions,
offer me alternatives and I decline.
It's the end of the world as we know it.
It's the end of the world as we know it.
It's the end of the world as we know it and I feel fine.
The other night I dreamt of knives, continental
drift divide. Mountains sit in a line, Leonard
Bernstein. Leonid Brezhnev, Lenny Bruce and Lester
Bangs. Birthday party, cheesecake, jelly bean, boom! You
symbiotic, patriotic, slam book neck, right? Right.
It's the end of the world as we know it.
It's the end of the world as we know it.
It's the end of the world as we know it and I feel
fine...fine...