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Questions and Answers
What is the primary function of the pelvis bone?
What is the primary function of the pelvis bone?
What is the name of the joint that connects the two pubic bones?
What is the name of the joint that connects the two pubic bones?
What type of pelvis is characterized by a narrow, triangular inlet?
What type of pelvis is characterized by a narrow, triangular inlet?
What is the term for the curved ridge at the top of the ilium bone?
What is the term for the curved ridge at the top of the ilium bone?
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What is the purpose of the pelvis bone during childbirth?
What is the purpose of the pelvis bone during childbirth?
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How many bones are fused to form the innominate bones?
How many bones are fused to form the innominate bones?
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Study Notes
Structure and Composition
- The pelvis bone is a basin-shaped structure composed of four bones: two innominate bones, the sacrum, and the coccyx.
- The innominate bones are formed by the fusion of three bones: ilium, ischium, and pubis.
- The pelvis bone is made up of compact and cancellous bone tissue.
Functions
- The pelvis bone provides a base of support for the spine and upper body.
- It acts as a point of attachment for muscles, ligaments, and tendons.
- The pelvis bone protects the reproductive organs, bladder, and rectum.
- It plays a crucial role in childbirth, as it expands to allow the baby to pass through.
Features and Landmarks
- The pelvis bone has several key features, including:
- Iliac crest: the curved ridge at the top of the ilium bone.
- Acetabulum: the socket in the pelvis bone that forms the hip joint.
- Ischial tuberosity: the bony prominence on the bottom of the pelvis bone.
- Pubic symphysis: the cartilaginous joint that connects the two pubic bones.
- Sacroiliac joint: the joint that connects the sacrum and ilium bones.
Types of Pelvis
- There are four main types of pelvis bones, classified based on their shape and size:
- Gynaecoid pelvis: the typical female pelvis, characterized by a wide, rounded inlet.
- Android pelvis: the typical male pelvis, characterized by a narrow, triangular inlet.
- Anthropoid pelvis: a rare type of pelvis, characterized by a narrow, oval inlet.
- Platypelloid pelvis: a rare type of pelvis, characterized by a flat, oval inlet.
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Description
Learn about the structure, composition, and functions of the pelvis bone, including its features, landmarks, and types. Understand its role in supporting the spine and upper body, and its importance in childbirth.
