Oviduct: isthmus
The isthmus is a narrow portion of the oviduct between the ampulla and the uterus. Folds and cilia decrease in the oviduct nearer the uterus, as secretory cells and smooth muscle increase. Therefore, the isthmus can be differentiated from the ampulla by the presence of fewer folds and thicker smooth muscle. 100x
Epithelium
The isthmus is a narrow portion of the oviduct between ampulla and uterus. Folds and cilia decrease in the oviduct nearer the uterus, as secretory cells and smooth muscle increase. Therefore, the isthmus can be differentiated from the ampulla by the presence of fewer folds and thicker smooth muscle. 100x
Lamina propria
The isthmus is a narrow portion of the oviduct between ampulla and uterus. Folds and cilia decrease in the oviduct nearer the uterus, as secretory cells and smooth muscle increase. Therefore, the isthmus can be differentiated from the ampulla by the presence of fewer folds and thicker smooth muscle. 100x
Muscularis externa
The isthmus is a narrow portion of the oviduct between ampulla and uterus. Folds and cilia decrease in the oviduct nearer the uterus, as secretory cells and smooth muscle increase. Therefore, the isthmus can be differentiated from the ampulla by the presence of fewer folds and thicker smooth muscle. 100x
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