Prominent pubic bone

The bone protrusion in the perineum is a normal structure, which is medically called the pubic symphysis. Under normal circumstances, it will protrude slightly compared to other parts of the body. If you are really worried, you can go to the hospital to take a pelvic X-ray to see if there are any abnormalities in the bones. If it is normal, there is no need to worry. This article introduces the anatomical knowledge around the pubic bone. Let’s learn about it together.

Pubis: Located in the front and lower part of the hip bone, it is divided into the body and the upper and lower branches. The body of the pubic bone constitutes the anterior and inferior part of the acetabulum. It is relatively thick and extends forward and medially to form the superior pubic ramus, which bends downward and transfers to the inferior pubic ramus. The upper edge of the superior ramus of the pubic bone is thin and sharp, called the pubic comb. It is continuous with the arcuate line posteriorly and ends in a round bulge forward, which is the pubic tubercle. The pubic bone is located in the lower abdomen and inner thigh. The pubic tubercle is an important body surface landmark. It also has a ridge extending inward to the upper edge of the pubic symphysis, called the pubic ridge. On the inner side of the transition between the superior and inferior branches of the pubic bone, there is an oval rough surface called the pubic symphysis surface.

The large hole formed by the pubic bone and the ischium is called the obturator foramen. The pubic bone forms the anterior and lower part of the hip bone, and is divided into two parts: upper and lower branches. The body constitutes the anterior and inferior 1/5 of the acetabulum. The upper edge of the bone surface at the junction with the ilium is rough and raised, called the iliopectine protuberance, from which the superior pubic ramus extends forward and inward, and its distal end turns sharply downward to become the inferior pubic ramus. There is a sharp ridge on the superior ramus of the pubic bone, called the pecten pubis, which moves posteriorly to the arcuate line and ends anteriorly at the pubic tubercle. It is an important surface landmark.

The rough upper edge of the pubic tubercle to the midline is the pubic ridge, which can also be palpated on the body surface. The oval rough surface on the inner side of the transition between the superior and inferior branches of the pubic bone is called the symphysial surface. The two sides of the symphysis surface are connected by cartilage to form the symphysis pubis. The inferior pubic ramus extends posteriorly, inferiorly and outwards to join the sciatic ramus, thus forming the obturator foramen together with the pubic bone.

The pubic bone makes up 2/5 of the hip bone.

When a woman gives birth, the pubic symphysis opens to allow the baby to be delivered smoothly. The bone protrusion in the perineum is a normal structure, called the pubic symphysis. Under normal circumstances, it will protrude more than other parts of the body. If you are worried, go to the hospital to take a pelvic X-ray to see if there are any abnormalities with the bones. If it is normal, there is no need to worry.