Female Pelvis | Practical Explanation | English | Nursing Lecture

Female Pelvis: Practical Explanation (Nursing Lecture)

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1. Summary

This nursing lecture provides a practical and detailed explanation of the female pelvis, emphasizing its crucial role as a bony canal for fetal passage during birth. The video covers the anatomical components of the pelvis, including its bones, joints, and ligaments, and delineates the functional divisions into the false and true pelvis. A significant portion is dedicated to identifying key landmarks and understanding the various diameters of the pelvic brim (inlet), cavity, and outlet, which are essential for assessing pelvic adequacy for childbirth.

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2. Key Takeaways

* The female pelvis is a bony canal vital for vaginal delivery.

* It is composed of specific bones, joints, and ligaments that provide structure and allow for some movement.

* The pelvis is functionally divided into the "false pelvis" (upper, non-pelvic brim) and the "true pelvis" (lower, pelvic brim and below).

* The true pelvis is the critical area for childbirth, defined by its inlet, cavity, and outlet.

* Understanding pelvic landmarks is essential for anatomical orientation.

* The diameters of the pelvic inlet, cavity, and outlet are critical measurements for assessing the pelvic passage for a fetus.

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3. Detailed Notes

**00:00 - Introduction to the Female Pelvis**

* Definition: The female pelvis is a bony canal through which the fetus must pass during birth.

* Key divisions: Brim, cavity, and outlet.

* Focus of the video: Bones, joints, ligaments, and diameters of the female pelvis, with a practical approach.

**01:18 - Female Pelvis Bones**

* The pelvis is formed by the articulation of several bones:

* **Two Hip Bones (Innominate Bones):** Each hip bone is a fusion of three bones:

* **Ilium:** The large, upper part of the hip bone.

* **Ischium:** The lower, posterior part (what you sit on).

* **Pubis:** The anterior part of the hip bone, forming the pubic symphysis.

* **Sacrum:** A triangular bone at the base of the spine, formed by fused vertebrae.

* **Coccyx:** The tailbone, located at the very end of the vertebral column, fused to the sacrum.

**09:17 - Female Pelvis Joints**

* The bones of the pelvis are connected by several joints:

* **Sacroiliac Joints (2):** Articulations between the sacrum and the ilium of each hip bone. These are strong, weight-bearing joints.

* **Pubic Symphysis (1):** The articulation between the two pubic bones at the front of the pelvis. This joint allows for slight movement, especially during pregnancy and childbirth due to hormonal influences.

* **Sacrococcygeal Joint (1):** The joint between the sacrum and the coccyx.

**09:54 - Female Pelvis Ligaments**

* Ligaments provide stability and strength to the pelvic joints. Key ligaments include:

* **Sacroiliac Ligaments:** Reinforce the sacroiliac joints (anterior, posterior, and interosseous).

* **Sacrospinous Ligament:** Connects the sacrum to the ischial spine, dividing the greater and lesser sciatic notches into the greater and lesser sciatic foramina.

* **Sacrotuberous Ligament:** Connects the sacrum to the ischial tuberosity. These two ligaments help to stabilize the pelvis.

* **Pubic Ligaments:** Reinforce the pubic symphysis (superior, inferior/arcuate).

**11:21 - False Pelvis**

* Also known as the **greater pelvis**.

* It is the upper, wider part of the abdominal cavity, situated *above* the pelvic brim.

* It is formed by the iliac fossae.

* It supports the abdominal organs.

* It is not directly involved in childbirth.

**11:44 - True Pelvis**

* Also known as the **lesser pelvis**.

* It is the lower, more confined part of the pelvis, situated *below* the pelvic brim.

* It forms the birth canal.

* It is divided into three parts:

* **Pelvic Brim/Inlet:** The upper boundary of the true pelvis.

* **Pelvic Cavity:** The space within the true pelvis.

* **Pelvic Outlet:** The lower boundary of the true pelvis.

**12:32 - Landmarks of the Female Pelvis**

* These are specific bony prominences used for anatomical reference and measurement.

* **Promontory:** The anterior projection of the first sacral vertebra, forming the posterior part of the pelvic brim.

* **Sacral Alae:** Wing-like projections lateral to the promontory.

* **Sacral Facets:** Articulate with the ilium.

* **Pelvic Wall:** Formed by the innominate bones.

* **Ischial Spines:** Bony projections on the ischium, important for marking the mid-pelvis.

* **Ischial Tuberosities:** Bony prominences that bear the weight when sitting.

* **Subpubic Angle:** The angle formed below the pubic symphysis.

**13:23 - Diameters of the Brim/Inlet of the Female Pelvis**

* The pelvic inlet is the entrance to the true pelvis. Its shape is somewhat heart-shaped in females.

* **Anatomical Diameters (True Conjugate):** These are measured from bony landmarks.

* **Anteroposterior (AP) Diameter (True Conjugate):** From the sacral promontory to the superior aspect of the pubic symphysis. This is the *most important* AP diameter for childbirth.

* **Transverse Diameter:** The widest diameter, running between the widest points of the pelvic brim, roughly midway between the sacral promontory and the symphysis.

* **Oblique Diameters (2):** Run from an SI joint on one side to the iliopectineal eminence on the opposite side.

* **Obstetrical Diameters:** These are practical measurements relevant for fetal passage, accounting for the angulation of the uterus.

* **Diagonal Conjugate:** From the sacral promontory to the *inferior* edge of the pubic symphysis. This is *not* measured directly but can be estimated clinically.

* **Obstetrical Conjugate:** From the sacral promontory to the posterior aspect of the pubic symphysis. This is the shortest AP diameter of the inlet and is crucial. (It is typically estimated from the diagonal conjugate: Diagonal Conjugate - 1.5 to 2 cm ≈ Obstetrical Conjugate).

**15:51 - Diameters of the Cavity of the Female Pelvis**

* The pelvic cavity is the space between the inlet and the outlet.

* **Anteroposterior (AP) Diameter:** Measured from the midpoint of the anterior wall to the midpoint of the posterior wall (sacrum).

* **Transverse Diameter:** The widest diameter, measured between the lateral walls of the pelvis, usually at the level of the ischial spines (this marks the level of the mid-pelvis).

* **Oblique Diameters:** Less clinically significant in the cavity compared to the inlet/outlet.

**16:54 - Diameters of the Outlet of the Female Pelvis**

* The pelvic outlet is the lower boundary of the true pelvis. It is diamond-shaped.

* **Anteroposterior (AP) Diameter (Anterior):** From the inferior edge of the pubic symphysis to the tip of the coccyx.

* **Anteroposterior (AP) Diameter (Posterior):** From the inferior edge of the pubic symphysis to the anterior surface of the sacrum. (The clinical AP diameter is often considered from the subpubic symphysis to the sacrococcygeal joint).

* **Transverse Diameter:** The distance between the posterior edges of the ischial tuberosities. This is the widest diameter of the outlet.

* **Subpubic Angle:** The angle formed by the pubic arch at the symphysis. A wider angle is generally more favorable for delivery.

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