Final answer:
The pelvis, consisting of four bones, is crucial for supporting body weight, muscle attachment, and protecting internal organs. The greater and lesser pelvis regions are responsible respectively for containing portions of the intestines and housing pelvic organs. The female pelvis has specific adaptations to facilitate childbirth
Step-by-step explanation:
The structures of the pelvis consist of several components that provide support, protection, and accommodate childbirth in females. The pelvis comprises four bones: the left and right hip bones, the sacrum, and the coccyx. These bones support the weight of the upper body and serve as attachment points for muscles, while also protecting internal organs. The hip bones are divided into three regions: the ilium, ischium, and pubis, which form bony landmarks like the anterior superior iliac spines and pubic tubercles.
The pelvis is divided into two main regions: the greater pelvis (also known as the false pelvis) and the lesser pelvis (true pelvis). The greater pelvis houses parts of the intestines and is more associated with the abdominal cavity. The lesser pelvis contains the bladder and other pelvic organs. These regions are separated by the pelvic brim (pelvic inlet).
Differences between male and female pelves include a wider form, larger subpubic angle, and broader greater sciatic notch in females to facilitate childbirth. The bones of the pelvis are united by ligaments, such as the sacrotuberous ligament, which provide stability and flexibility for movement and accommodating childbirth.