Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
c. The weight of the body in the sitting position is supported by the ischial tuberosities.
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7. The Skeletal System
The Pelvic Girdle
1:57 minutesProblem 19
Textbook Question
What bones make up each hip bone (coxal bone)? Which of these is the largest?
Which has tuberosities that we sit on?
Which is the most anterior?
Verified step by step guidance1
The hip bone, also known as the coxal bone, is composed of three fused bones: the ilium, ischium, and pubis. These bones fuse during development to form a single structure.
The ilium is the largest of the three bones. It forms the superior portion of the hip bone and includes the iliac crest, which can be felt along the upper edge of the pelvis.
The ischium is the bone that has tuberosities, specifically the ischial tuberosities. These are the bony prominences that bear weight when sitting down.
The pubis is the most anterior of the three bones. It forms the front portion of the hip bone and connects to the opposite pubis bone at the pubic symphysis, a cartilaginous joint.
Together, these three bones contribute to the structure of the pelvis, providing support for the body and attachment points for muscles and ligaments.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Coxal Bone Anatomy
The coxal bone, also known as the hip bone, is composed of three fused bones: the ilium, ischium, and pubis. Each of these bones contributes to the overall structure and function of the hip joint, providing support and facilitating movement. Understanding the anatomy of these bones is essential for identifying their specific features and roles.
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Ilium, Ischium, and Pubis
The ilium is the largest part of the coxal bone, forming the upper portion and providing a broad surface for muscle attachment. The ischium is located at the lower back part of the hip bone and features the ischial tuberosities, which are the bony prominences we sit on. The pubis is the most anterior part of the coxal bone, contributing to the pelvic girdle's stability and structure.
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Pelvic Structure and Function
The pelvic structure is crucial for weight-bearing and locomotion, as it connects the spine to the lower limbs. The arrangement of the ilium, ischium, and pubis allows for a stable base for the body while also accommodating the passage of nerves and blood vessels. Understanding the functional aspects of these bones helps in recognizing their importance in both movement and support.
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