Theischial
Theischial is an anatomical term meaning relating to the ischium, one of the three bones that form the pelvis. The ischium contributes to the lower, posterior portion of the hip bone and, with the ilium and pubis, forms the acetabulum and contributes to the pelvic ring. The body of the ischium helps form the posterior wall of the acetabulum, while its ramus extends downward and forward to join the inferior ramus of the pubis, creating the ischiopubic ramus.
Key features in the ischial region include the ischial tuberosity, a prominent rough projection that bears
Muscular attachments: The hamstring muscles—the semitendinosus, semimembranosus, and the long head of the biceps femoris—originate from
Clinical relevance: The ischial tuberosities bear seating weight, making them a common site for pressure ulcers
Notes: The form theischial is uncommon in modern anatomy; most texts use ischial as the standard adjective.