fused sacrum

A collection of sacral vertebrae in the sacral region that are fused and part of the bony pelvis. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the fused sacrum is

A collection of sacral vertebrae in the sacral region that are fused and part of the bony pelvis. The atlas records it as a bone at the organ scale in the human body.

Where the fused sacrum is

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

What the fused sacrum connects to

The atlas records 33 typed relationships for it, across 7 kinds of connection. part of abdominal segment of trunk, bony pelvis and dorsum, and 3 more.

Supply and innervation

Venous drainage: lateral sacral vein.

Also called

Also recorded as os sacrum [vertebrae sacrales I - V], sacrum, sacrum [sacral vertebrae I - V], sacrum [sacral vertebrae I-V], os sacrum and sacral bone. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0003690, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: abdominal segment of trunk, bony pelvis, dorsum, postcranial axial skeleton, sacral region and trunk.
• A kind of: bone element, irregular bone, organ, pelvic region element, subdivision of vertebral column and trunk region element.
• contains: alae of sacrum, anterior sacral foramina of sacrum, intermediate sacral crest of sacrum, lateral sacral crest of sacrum, linea terminalis of sacrum and median sacral crest of sacrum, and 8 more.
• originates from: gluteus maximus, iliocostalis muscle and piriformis muscle.
• connects: sacro-iliac joint and sacrococcygeal symphysis.
• Drained by: lateral sacral vein.
• inserts into: pubococcygeus muscle.

Questions

Where is the fused sacrum?

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

What does the fused sacrum connect to?

Part of: abdominal segment of trunk, bony pelvis, dorsum, postcranial axial skeleton, sacral region and trunk.

Is the fused sacrum 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.