Pubis (bone): Difference between revisions

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Pubis (bone)

The pubis is one of the three principal bones that make up the pelvis. It is located in the anterior part of the pelvic girdle and plays a crucial role in supporting the weight of the upper body when sitting and standing, as well as providing attachment points for various muscles.

Anatomy

The pubis is divided into three main parts:

Body of Pubis

The body of the pubis is the central portion of the bone. It is flattened and forms the wide, medial part of the pubic bone. The body of the pubis articulates with the bodies of the ischium and ilium to form the acetabulum, which is the socket for the femur in the hip joint.

Superior Ramus

The superior ramus of the pubis extends laterally from the body of the pubis. It contributes to the formation of the acetabulum and the obturator foramen. The superior ramus is important for the attachment of the pectineus muscle.

Inferior Ramus

The inferior ramus of the pubis extends downward and laterally from the body of the pubis. It joins with the inferior ramus of the ischium to form the ischiopubic ramus. This structure provides attachment for the adductor magnus and gracilis muscles.

Function

The pubis serves several important functions in the human body:

Support: It helps support the weight of the upper body when sitting and standing.
Protection: It protects the pelvic organs, including parts of the urinary bladder, reproductive organs, and the distal part of the large intestine.
Muscle Attachment: It provides attachment points for muscles involved in movement of the thigh and stabilization of the pelvis.

Clinical Significance

Fractures

Fractures of the pubis can occur due to trauma, such as in a car accident or a fall. These fractures can be painful and may require surgical intervention depending on the severity and displacement of the fracture.

Osteitis Pubis

Osteitis pubis is an inflammation of the pubic symphysis and surrounding muscle insertions. It is often seen in athletes and can cause pain in the groin and lower abdomen.

Symphysis Pubis Dysfunction

Symphysis pubis dysfunction (SPD) is a condition that can occur during pregnancy, where the ligaments that normally keep the pubic symphysis stable become too relaxed and stretchy, causing pain and instability in the pelvic region.

Development

The pubis, along with the ischium and ilium, begins to ossify from cartilage during fetal development. The three bones are separate at birth but gradually fuse together during adolescence to form the mature pelvis.

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-== Structure of the Pubis Bone ==
+Pubis (bone)
-The pubis bone is one of the three bones that make up the pelvis, along with the ilium and ischium. It is located in the lower part of the pelvic girdle, and its structure plays a crucial role in supporting the weight of the upper body and providing attachment points for various muscles and ligaments.
+The '''pubis''' is one of the three principal bones that make up the pelvis. It is located in the anterior part of the pelvic girdle and plays a crucial role in supporting the weight of the upper body when sitting and standing, as well as providing attachment points for various muscles.
-=== Anatomy ===
+==Anatomy==
-The pubis bone consists of a body and two branches, known as the superior and inferior pubic rami. The body of the pubis bone is located in the midline of the pelvis, forming the anterior part of the pubic arch. It is a flat, triangular-shaped bone that curves inward and downward, resembling the shape of a shallow cup.
+The pubis is divided into three main parts:
-The superior pubic ramus extends superiorly from the body of the pubis bone, connecting it to the ilium bone. It is a thick and strong bone that contributes to the stability of the pelvis. On the other hand, the inferior pubic ramus extends inferiorly from the body of the pubis bone, joining with the ischium bone. It is relatively thinner and less prominent compared to the superior pubic ramus.
+===Body of Pubis===
-=== Articulations ===
+The body of the pubis is the central portion of the bone. It is flattened and forms the wide, medial part of the pubic bone. The body of the pubis articulates with the bodies of the [[ischium]] and [[ilium]] to form the acetabulum, which is the socket for the [[femur]] in the hip joint.
-The pubis bone articulates with the other two bones of the pelvis, namely the ilium and ischium. At the superior aspect, the pubis bone forms the pubic symphysis, a cartilaginous joint that connects the two pubic bones together. This joint allows for a small amount of movement, which is important during childbirth and other activities that involve pelvic mobility.
+===Superior Ramus===
-The pubis bone also articulates with the sacrum, forming the sacroiliac joint. This joint is a synovial joint that connects the pelvis to the vertebral column, providing stability and transmitting forces between the upper body and the lower limbs.
+The superior ramus of the pubis extends laterally from the body of the pubis. It contributes to the formation of the acetabulum and the obturator foramen. The superior ramus is important for the attachment of the [[pectineus]] muscle.
-=== Ligamentous Attachments ===
+===Inferior Ramus===
-Several ligaments attach to the pubis bone, providing stability and support to the pelvis. The superior pubic ligament attaches to the superior pubic ramus, reinforcing the superior aspect of the pubic symphysis. The inferior pubic ligament attaches to the inferior pubic ramus, providing additional support to the pubic symphysis.
+The inferior ramus of the pubis extends downward and laterally from the body of the pubis. It joins with the inferior ramus of the ischium to form the ischiopubic ramus. This structure provides attachment for the [[adductor magnus]] and [[gracilis]] muscles.
-The pubic tubercle, a bony prominence located at the anterior aspect of the pubis bone, serves as an attachment point for the inguinal ligament. This ligament extends from the pubic tubercle to the anterior superior iliac spine, forming the floor of the inguinal canal.
+==Function==
-=== Function ===
+The pubis serves several important functions in the human body:
-The pubis bone, along with the other bones of the pelvis, plays a crucial role in weight-bearing and locomotion. It provides a stable base for the upper body and supports the weight of the abdominal organs. The pubic symphysis allows for a small amount of movement, which is important during activities such as walking, running, and jumping.
+* '''Support''': It helps support the weight of the upper body when sitting and standing.
+* '''Protection''': It protects the pelvic organs, including parts of the [[urinary bladder]], [[reproductive organs]], and the distal part of the [[large intestine]].
+* '''Muscle Attachment''': It provides attachment points for muscles involved in movement of the thigh and stabilization of the pelvis.
-The pubis bone also serves as an attachment site for various muscles involved in pelvic stability and movement. The adductor muscles, including the adductor longus, adductor brevis, and adductor magnus, originate from the pubis bone and help in bringing the legs together. The rectus abdominis muscle, which is responsible for flexing the trunk, attaches to the pubic symphysis via the pubic crest.
+==Clinical Significance==
-=== Clinical Significance ===
+===Fractures===
-Injuries to the pubis bone can occur due to trauma or overuse, leading to conditions such as pubic symphysis dysfunction or pubic stress fractures. These conditions can cause pain and discomfort in the pelvic region, affecting daily activities and sports performance. Proper diagnosis and treatment are essential to manage these conditions effectively.
+Fractures of the pubis can occur due to trauma, such as in a car accident or a fall. These fractures can be painful and may require surgical intervention depending on the severity and displacement of the fracture.
-== See Also ==
+===Osteitis Pubis===
+Osteitis pubis is an inflammation of the pubic symphysis and surrounding muscle insertions. It is often seen in athletes and can cause pain in the groin and lower abdomen.
+===Symphysis Pubis Dysfunction===
+Symphysis pubis dysfunction (SPD) is a condition that can occur during pregnancy, where the ligaments that normally keep the pubic symphysis stable become too relaxed and stretchy, causing pain and instability in the pelvic region.
+==Development==
+The pubis, along with the ischium and ilium, begins to ossify from cartilage during fetal development. The three bones are separate at birth but gradually fuse together during adolescence to form the mature pelvis.
+==See Also==
 * [[Pelvis]]
-* [[Ilium (bone)]]
+* [[Ischium]]
-* [[Ischium (bone)]]
+* [[Ilium]]
+* [[Acetabulum]]
+* [[Hip joint]]
-== References ==
+{{Anatomy-stub}}
-<references>
+[[Category:Pelvic anatomy]]
-<ref>Smith, J. (2019). Anatomy and Physiology for Nurses E-Book. Elsevier Health Sciences.</ref>
+[[Category:Skeletal system]]
-<ref>Standring, S. (Ed.). (2016). Gray's Anatomy E-Book: The Anatomical Basis of Clinical Practice. Elsevier Health Sciences.</ref>
+[[Category:Orthopedics]]
-</references>