Neck of the uterus
Although the cervix is part of the uterus, structure and function differ from the main body of the uterus.
SITUATION
- It forms the lower 1/3 of the uterus and is the area below the isthmus which includes the internal and external os.
- It enters the vagina at right angle.
SHAPE
- The cervical canal is fusiform and the cervix as a whole is Barrel shaped.
SIZE
- It is 2.5cm long in adult. It becomes bigger in pregnancy and at times at birth it becomes almost equal size with the uterus.
GROSS STRUCTURE
- Supravaginal cervix – this is the portion that lies outside and above the vagina.
- Superiorly, it meets the border of the uterus at the isthmus.
- The infravaginal cervix – the portion which projects into the vagina.
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