Final answer:
The joint between the sacrum and the coxa is called the sacroiliac joint, and the joint between the two pubis bones is called the pubic symphysis. The acetabulum is a deep, cup-shaped cavity located on the lateral side of the hip bone and is part of the hip joint. The ischial tuberosity provides support and cushioning when sitting.
Step-by-step explanation:
The joint between the sacrum and the coxa is called the sacroiliac joint. It is supported by ligaments such as the anterior and posterior sacroiliac ligaments, as well as the sacrospinous and sacrotuberous ligaments which attach to the ischial spine and ischial tuberosity respectively.
The joint between the two pubis bones is called the pubic symphysis. It is a cartilaginous joint that allows for minimal movement and serves as a point of attachment for muscles.
The acetabulum is a deep, cup-shaped cavity located on the lateral side of the hip bone. It forms part of the hip joint and articulates with the head of the femur.
The function of the ischial tuberosity is to provide support and cushioning when sitting. It serves as an attachment point for muscles and tendons, including the hamstrings.
Learn more about Joints of the Pelvic Girdle