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The ischium forms the lower and back part of the hip bone . Situated below the ilium and behind the pubis the superior portion of this bone forms approximately one third of the acetabulum which articulates with the femoral head forming the hip joint.
The ischium is divisible into three portions; the body and the superior and inferior rami.
The body contains a prominent spine that is the origin for the gemellus superior muscle. Two indentations run parallel to the spine, superiorly the greater sciatic notch and inferiorly the lesser sciatic notch, through which key nervous and vascular vessels pass.
The superior ramus of the ischium extends inferiorly and posteriorly from the body. It is the partial origin for the obturator internus and obturator externus muscles. Posteriorly the ramus forms a large swelling termed the tuberosity of the ischium, or ischial tuberosity, which supports weight whilst sitting and is the origin for the gemellus inferior and adductor magnus muscles. Dorsally the ramus contributes to the obturator foramen, a large opening in the pelvis through which key nervous and vascular vessels pass.
The inferior ramus of the ischium is thin and flattened and ascend from the superior ramus of the ischium joining the inferior ramus of the pubis. It is the partial origin for the gracillis and adductor magnus muscles.
Source: Boundless. “Ischium.” Boundless Anatomy and Physiology. Boundless, 03 Aug. 2016. Retrieved 28 Aug. 2016 from https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/skeletal-system-parts-of-the-skeleton-7/the-hip-87/ischium-490-1133/