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Placenta: 1st trimester

All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x

Intervillous space <p>All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x</p>

Intervillous space

All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x
- Maternal blood <p>All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x</p>

- Maternal blood

All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x
Floating villi <p>All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x</p>

Floating villi

All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x
- Embryonic connective tissue <p>All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x</p>

- Embryonic connective tissue

All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x
- Embryonic blood vessels <p>All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x</p>

- Embryonic blood vessels

All chorionic villi extend into the intervillous space filled with maternal blood. Each villus, with a central core of embryonic connective tissue and embryonic blood vessels, is covered by an inner layer of cytotrophoblastic cells and an outer layer of syncytiotrophoblast. 400x
- Cytotrophoblast > <p>In the early placenta, cytotrophoblastic cells form a continuous, single-cell layer surrounding the embryonic connective tissue. These cells give rise to the multinucleated syncytiotrophoblast that lines the intervillous space. </p>

- Cytotrophoblast >

In the early placenta, cytotrophoblastic cells form a continuous, single-cell layer surrounding the embryonic connective tissue. These cells give rise to the multinucleated syncytiotrophoblast that lines the intervillous space.

- Syncytiotrophoblast <p>In the early placenta, cytotrophoblastic cells form a continuous, single-cell layer surrounding the embryonic connective tissue. These cells give rise to the multinucleated syncytiotrophoblast that lines the intervillous space. </p>

- Syncytiotrophoblast

In the early placenta, cytotrophoblastic cells form a continuous, single-cell layer surrounding the embryonic connective tissue. These cells give rise to the multinucleated syncytiotrophoblast that lines the intervillous space.

Main SlideIntervillous space - Maternal bloodFloating villi - Embryonic connective tissue - Embryonic blood vessels - Cytotrophoblast > - Syncytiotrophoblast