General information
The pubic bone (lat. Os pubis) is a flat bone and part of the pelvis. It occurs on both sides of the pelvis and is connected in the midline by the pubic symphysis.
It is divided into a pubic bone body (Corpus ossis pubis) and two pubic branches (ramus superior and inferior of the Os pubis). The pubic bone is part of the hip joint and the origin of some muscles that contribute to the development of the pelvic floor. The pubic bone is an angular, flat bone which is part of the pelvis.
It is present on both sides of the pelvis. The pubic bones are connected by a fibrous cartilaginous connection, the pubic symphysis. Since this connection is a fibrous cartilage, the two pubic bones are easily movable against each other.
These parts are called corpus ossis pubis. Two branches of the pubic bone connect to it, the ramus superior (upper branch) and the ramus inferior (lower branch) of the pubic bone. These represent the connections to the adjacent bones and are part of the hip joint.
The upper branch of the pubic bone (ramus superior ossis pubis) is connected to the ilium (os ilium), the lower branch of the pubic bone (ramus inferior ossis pubis) to the ischium (os ischii). These connections are bony and therefore not movable against each other. The pubic bone forms the front part of the acetabulum.
Together with the head of the femur (caput femoris), the acetabulum forms the hip joint. The anterior edge of the pubic bone is called the pubic crest (Pecten ossis pubis). The midline, i.e. the connection between the two pubic bones, is called the symphysis.
At its transition to the midline, the pubic crest carries a small hump, which is called tuberculum pubicum. It serves as the starting point of the inguinal ligament. At the lateral edge of the pubic crest it ends in another hump, the Eminentia iliopubica.
This represents the border to the ilium. In addition, the pubic bone limits the anterior arch of the Foramen obturatorum. This is closed by the Musculus obturator externus and internus.
This leaves only a small canal, the Canalis obturatorius. The obturator nerve, as well as the obturator vein and artery run through this canal. The pubococcygeus muscle and the puborectalis muscle originate from the pubic bone.
Both are parts of the Musculus levator ani and thus form the pelvic floor muscles. Furthermore, the Musculus transversus perinei profundus originates at the pubic bone. This is part of the urogenital diaphragm, which in turn is involved in building the pelvic floor.
The pubic bone (Os pubis) is part of the bony pelvis and is present once on each side of the pelvis. It is part of the hip joint and forms the acetabulum together with the ilium and ischium. The two parts are connected by a fibrous cartilage in the middle (symphysis) and are therefore movable against each other. Furthermore, the pubic bone is the origin of some muscles that form parts of the pelvic floor.
