Summary
Summary Human Embryology – Lecture 6
- Course
- Institution
- Book
Human Embryology – Lecture 6
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Human Embryology and Developmental Biology - Lecture 7 [Molecular Development]
-
Human Embryology and Developmental Biology – Lecture 3
-
Human Embryology and Developmental Biology – Lecture 2
Seller
Follow
rishology
Reviews received
Content preview
Human Embryology – Lecture 6 (Lecture 11 + 12)23-02-2018
Recapitulation:
Gastrulation: formation of the three embryonic germ layers (ectoderm, mesoderm,
endoderm)
Neurulation: establishing the neural tube, after induction of the ectoderm, via the
notochord.
Notochord: induction of neural plate, defines body-axis.
The Notochordal process:
- Initially the notochord starts off as a hollow tube.
- Then, the primitive pit moves more caudal while the notochord end moves
more rostral.
The Notochord is the first organ that will establish the body-axis.
Formation of the pituitary (hypophysis):
Two ectodermal parts will move towards each other and fold around each other, in
order to make up the pituitary.
Ratkhe’s pouch (part of the mouth) + the infundibulum (part of the brain –
hypothalamus) move towards each other and fold around each other, forming the
pituitary which makes up our hormones.
Development of the nervous system:
Alar (dorsal) regions – sensory
Basal (ventral) regions – motor (ganglia)
Sulcus limitans separates the motor nuclei from the sensory nuclei.
, SHH= Sonic Hedgehog Morphogen
SHH is responsible for the dorsal-ventral patterning.
Paraxial mesoderm:
Can divide into:
- Sclerotome (bones/skeleton)
- Dermatome (dermis-skin)
- Myotome (muscles)
Formation and differentiation of the sclerotome will form your vertebrate.
Vertebra are necessary in order to intentionally do things (e.g. with your hands and
feet).
Folding:
Folding of the embryo is a significant process!
Folding of the embryo happens laterally and at the head + tail.
Lateral folding: important for closure of the primitive gut.
Explanation lateral folding:
The 3-germlayers are pushed together, which will form a bridge-like round hollow
structure this will later be enclosed and forms the primitive gut.
Tadpole shape: rounded shape.
Primitive gut:
- Encloses tubular part of the yolk sac.
- Site of the future digestive tube and respiratory structures.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller rishology. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.28. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now