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Summary Human Embryology - Lecture 7
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Human Embryology - Lecture 7
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Human Embryology – Lecture 7 (Lecture 13)09-03-18
Development of the nervous system:
- The choroid plexus is a structure in the ventricles of the brain, where
cerebrospinal fluid (CSF) is produced.
- The pineal body is a small endocrine gland in the vertebrate brain. It
produces melatonin, a hormone that affects the modulation of wake/sleep
patterns.
- The infundibulum is a small outgrowth of the ventral wall of the embryo brain
from which the pars nervosa of the pituitary gland develops.
Development of the cardiovascular system:
- Tubes
- Septation
Vena umbilicales: only vein with oxygen-rich blood and nutrients before birth.
The extra-embryonic structures:
Yolk sac:
- Strongly reduced nutritive function
- Hematopoiesis
- Formation of the germ cells
Amnion:
- Protective fluid-filled capsule protecting the fetus from adhesion
- Buffer against mechanical injury
- Allows normal fetal movements and symmetrical growth
- Regulation of temperature
- Source of oral fluid
- Excretion-collection repository
Allantois:
- Has only a secondary function
- Involved in respiration and differentiation of blood vessels
- Formation of the umbilical cord
Placental complex:
- Formed by the chorion and the maternal endometrial tissue
- Uteroplacental circulation bringing food and oxygen and removing wastes.
Endoderm derivates:
1. The digestive tube
2. The respiratory tube: which is an outgrowth of the digestive tube
a. Starts with the primitive gut, which pinches off into the respiratory tract.
Saggital sections: from the side
Function:
1. Induce the formation of several endodermic structures
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