Ischium

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Ischium of pelvis
Pelvic girdle
Left hip-joint, opened by removing the floor of the acetabulum from within the pelvis. (Ischium labeled at bottom left.)
Details
Origins	Superior gemellus
Identifiers
Latin	os ischii
MeSH	D007512
TA98	A02.5.01.201
TA2	1339
FMA	16592
Anatomical terms of bone [edit on Wikidata]

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.