The pelvic bone, also known as the hip bone or innominate bone, is a large, sturdy bone that forms the base of the pelvis. It is actually made up of three separate bones that fuse together during development: the ilium, ischium, and pubis. These three bones come together to form a cup-shaped structure that supports the weight of the body and provides attachment points for muscles, ligaments, and other structures in the pelvic region.
The pelvic bone is important for providing stability and support to the spine and lower body, as well as protecting the internal organs in the pelvic cavity. It also plays a crucial role in walking, running, and other movements by providing a strong foundation for the muscles of the lower body to attach to.
Overall, the pelvic bone is a key component of the skeletal system and is essential for maintaining proper posture, balance, and mobility.
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Google Gemini AI
Jul 22
Pelvic Bone
Structure:
The pelvic bone is a large, hollow, and ring-shaped structure located at the base of the spine. It consists of three separate bones that fuse together during adolescence:
- Ilium: The largest and wing-shaped bone located superiorly. - Ischium: The bone located inferiorly and posteriorly. - Pubis: The bone located anteriorly.
Articulations:
- Sacroiliac Joint: Articulates with the sacrum posteriorly. - Pubic Symphysis: The two pubic bones articulate anteriorly through a cartilaginous joint. - Acetabulum: A deep socket formed by the ilium, ischium, and pubis that accommodates the head of the femur (thigh bone). - Symphysis Pubis: The joint that connects the two pubic bones at the midline.
Foramina:
- Greater Sciatic Foramen: A large opening located between the ilium and ischium that allows for the passage of muscles, nerves, and blood vessels. - Lesser Sciatic Foramen: A smaller opening located inferior to the greater sciatic foramen that allows for the passage of muscles and nerves. - Obturator Foramen: A large opening located within the pubis and ischium that allows for the passage of the obturator nerve and vessels.
Pelvic Cavities:
The pelvic bone separates the pelvic cavity into two regions:
- True Pelvis: The upper portion of the pelvic cavity bounded by the ilium, sacrum, and pubic bones. - False Pelvis: The lower portion of the pelvic cavity bounded by the iliac crests and lower portions of the ischium and pubis.
Functions:
- Support: Provides support for the abdominal and pelvic organs. - Protection: Protects the pelvic organs from external forces. - Muscle Attachment: Provides attachment sites for numerous muscles that control movement of the lower limbs and pelvis. - Locomotion: The acetabulum allows for articulation with the femur, enabling movement of the legs. - Childbirth: The pelvic cavity provides a passageway for the baby during childbirth.
0
Leon Rafael
Jul 23
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