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The ischium (/ ˈɪski.əm /; [1] pl.: ischia) forms the lower and back region of the hip bone (os coxae). Situated below the ilium and behind the pubis, it is one of three regions whose fusion creates the coxal bone. The superior portion of this region forms approximately one-third of the acetabulum.
The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known colloquially as the sit bones or sitz bones, [1] or as a pair the sitting bones, [2] is a large posterior bony protuberance on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet.
The hip bone (os coxae, innominate bone, pelvic bone[1][2] or coxal bone) is a large flat bone, constricted in the center and expanded above and below. In some vertebrates (including humans before puberty) it is composed of three parts: the ilium, ischium, and the pubis.
The ischium (/ ˈɪski.əm /; pl.: ischia) forms the lower and back region of the hip bone (os coxae). Quick Facts Details, Origins ... Close. Situated below the ilium and behind the pubis, it is one of three regions whose fusion creates the coxal bone. The superior portion of this region forms approximately one-third of the acetabulum. Structure.
Forming the lower and back sides of the hip bone, the ischium is one of the three bones that make up the pelvis. It is located beneath the ilium and behind the pubis. The upper portion of the ischium forms a major part of the concave portion of the pelvis that forms the hip.
Quick Facts. Functions. Being a part of the pelvis, it plays a great role in several body movements, such as walking and jogging. It is also essential in maintaining balance and an erect posture. Ischium Anatomy, Parts, and Bony Landmarks. The ischium is divided into two main parts: the body and ramus.
The ischium (Latin: os ischii) is a paired bone of the pelvis that forms the lower and back part of the hip bone, as well as the posterior and inferior boundary of the obturator foramen. Image 1: Ischium posterior view, Image 2: anterior view. The ischium consists of two main parts:
The ischium consists of two main parts: The body of ischium - the irregular-shaped part of the bone that forms the posterior one-third of the acetabulum. The ramus (branch) of ischium - extends inferiorly from the body and unites with the inferior ramus of the pubis.
The ischium forms the posteroinferior part of the hip bone. Much like the pubis, it is composed of a body, an inferior ramus and superior ramus. The inferior ischial ramus combines with the inferior pubic ramus forming the ischiopubic ramus, which encloses part of the obturator foramen.
The ischial spine is a sharp bony prominence found on the ramus of the ischium. It sits between the greater and lesser sciatic notches, at the level of the lower border of the acetabulum.