Plane of Entry into the Small Pelvis

The pelvic inlet plane, also known as the planum introitus pelvis, is an anatomical structure that plays an important role in obstetrics and gynecology. It defines the boundaries of the entrance to the pelvis and serves as an important reference point when considering anatomy and conducting clinical studies.

The pelvic inlet plane passes through several key anatomical structures. It begins on the upper surface of the symphysis of the pubic bones, which connect in front. The plane then passes through the protrusion of the sacrum, which is the lower part of the spinal column. Finally, it ends at the top of the coccyx, which is a small bony structure at the bottom of the spinal column.

The shape of the pelvic inlet plane may vary between individuals. It can be oval, round or irregular in shape. Physiological characteristics of the female body, such as pregnancy, can affect the size and shape of the pelvic inlet plane. During pregnancy, it may expand slightly to allow the fetus to pass through the birth canal.

Obstetricians and gynecologists widely use the pelvic inlet plane to determine fetal position and perform vaginal delivery. It helps to assess the patency of the birth canal and predict possible difficulties during childbirth. For example, if the plane of the pelvic inlet is narrowed or irregularly shaped, this may cause difficulty in the passage of the fetus and require medical intervention such as a caesarean section.

In addition, the pelvic inlet plane can be used to measure anatomical parameters in clinical studies. It provides a reference point for measuring pelvic widths and diameters, which can be useful in assessing pelvic organ morphology and fetal age.

In conclusion, the pelvic inlet plane is an important anatomical structure that defines the boundaries of the pelvic inlet. It comes in a variety of forms and is used for fetal position determination, labor and delivery, and clinical research. Understanding the anatomy and parameters of the pelvic inlet plane is an important aspect in the field of obstetrics and gynecology, which allows for safe and effective medical interventions for women and fetuses.