Lecture - Week 3 Development: Difference between revisions

Revision as of 17:58, 1 August 2011

2010 Lecture | placentation | gastrulation | Notochord

Objectives

Germ layers

Understand broadly the events of week 2-3 of human development
Understand the process early placentation, villi formation
Understand the process of gastrulation
Understand the process of axis formation

Early Placentation

Development Animation - Implantation

Early placenta anchoring villi

The trophoblast layer has now differentiated into two morphologically distinct cellular layers.

Syncitiotrophoblasts - form a multinucleated cytoplasmic mass by cytotrophoblast cell fusion and both invade the decidua and secrete hCG
Cytotrophoblasts - form a cellular layer around the blastocyst, proliferates and extends behind syncitiotrophoblasts

Early Utero-Placental exchange - transfer of nutrition from maternal lacunae filled with secretions from uterine glands and maternal blood from blood vessels. The development of trophoblast villi extending into the uterine decidua.

There are three stages of villi development:

Primary Villi - cytotrophoblast
Secondary Villi - cytotrophoblast + extraembryonic mesoderm
Tertiary Villi - cytotrophoblast + extraembryonic mesoderm+ blood vessels

There are two main types of early villi:

Anchoring villi - attached to decidua
Floating villi - not attached to decidua, floating in maternal lacunae.

Maternal endometrium

Decidual reaction

Co-ordinator Note

Dr Mark Hill

ANAT2341 Embryology S2 2011

Lecture content is made available on the Monday of the associated lecture week.
Some guest lecturers will provide additional handouts or lecture notes.
For background information see Embryonic Development and Systems Notes
2011 Timetable | 2011 Students

--Mark Hill 06:47, 20 July 2011 (EST)

Course Content 2011

Glossary Links

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Cite this page: Hill, M.A. (2024, April 30) Embryology Lecture - Week 3 Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Lecture_-_Week_3_Development

What Links Here?

@@ Line 7: / Line 7: @@
 * Understand the process of gastrulation
 * Understand the process of axis formation
+== Early Placentation ==
+[[Development Animation - Implantation]]
+[[Image:Placenta anchoring villi.jpg|thumb|Early placenta anchoring villi]]
+The trophoblast layer has now differentiated into two morphologically distinct cellular layers.
+*'''Syncitiotrophoblasts''' - form a multinucleated cytoplasmic mass by cytotrophoblast cell fusion and both invade the decidua and secrete hCG
+*'''Cytotrophoblasts''' - form a cellular layer around the blastocyst, proliferates and extends behind syncitiotrophoblasts
+Early Utero-Placental exchange - transfer of nutrition from maternal lacunae filled with secretions from uterine glands and maternal blood from blood vessels.
+The development of trophoblast villi extending into the uterine decidua.
+There are three stages of villi development:
+* Primary Villi - cytotrophoblast
+* Secondary Villi - cytotrophoblast + extraembryonic mesoderm
+* Tertiary Villi - cytotrophoblast + extraembryonic mesoderm+ blood vessels
+There are two main types of early villi:
+* Anchoring villi - attached to decidua
+* Floating villi - not attached to decidua, floating in maternal lacunae.
+'''Maternal endometrium'''
+* Decidual reaction