ischium

Endochondral bone that is paired, forming the posterior part of the pelvis, articulating with the pubis and ilium. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the ischium is

Endochondral bone that is paired, forming the posterior part of the pelvis, articulating with the pubis and ilium. The atlas records it as a bone at the organ scale in the human body.

Where the ischium is

It sits in the pelvis and trunk, within the skeletal system. Positioned deliberately as part of this species body plan.

What the ischium connects to

The atlas records 19 typed relationships for it, across 6 kinds of connection. part of innominate bone, material anatomical entity and pelvic girdle skeleton, and 1 more.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the ischium. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as ischial bone, ischium bone and os ischii. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001274, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: innominate bone, material anatomical entity, pelvic girdle skeleton and bony pelvis.
• A kind of: anatomical structure, bone of hip region, endochondral bone, pelvic girdle bone/zone, pelvic region element and skeletal element.
• contains: greater sciatic notch, ischial ramus, ischial spine and lesser sciatic notch.
• originates from: external urethral sphincter, gemellus muscle and ischiocavernosus muscle.
• composed of: bone tissue.
• contributes to morphology of: pelvic girdle bone/zone.

Questions

Where is the ischium?

It sits in the pelvis and trunk, within the skeletal system. Positioned deliberately as part of this species body plan.

What does the ischium connect to?

Part of: innominate bone, material anatomical entity, pelvic girdle skeleton and bony pelvis.

Is the ischium the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.