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Placenta: 3rd trimester

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

Intervillous space <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

Intervillous space

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

Floating villi <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

Floating villi

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

- Fetal connective tissue <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

- Fetal connective tissue

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

- Fetal blood vessels <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

- Fetal blood vessels

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

- Cytotrophoblast <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

- Cytotrophoblast

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

- Syncytiotrophoblast <p>Villi appear similar to those in early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

- Syncytiotrophoblast

Villi appear similar to those in early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

- Clumped nuclei <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

- Clumped nuclei

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

- Fibrinoid <p>Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x</p>

- Fibrinoid

Villi appear similar to those in the early placenta except that fetal connective tissue is more condensed; cytotrophoblast cells form a discontinuous layer beneath the syncytiotrophoblast; fibrinoid is seen in villi; and syncytiotrophoblastic nuclei tend to clump. Fetal capillaries are more numerous and are frequently located immediately beneath the syncytial layer. 400x

Main Slide Intervillous space Floating villi - Fetal connective tissue - Fetal blood vessels - Cytotrophoblast - Syncytiotrophoblast - Clumped nuclei - Fibrinoid