coccyx

A collection of caudal vertebrae in the coccygeal 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 coccyx is

A collection of caudal vertebrae in the coccygeal 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 coccyx is

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

What the coccyx connects to

The atlas records 13 typed relationships for it, across 6 kinds of connection. part of bony pelvis, dorsum and organism subdivision, and 1 more.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the coccyx. 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 coccygeal skeleton, coccygeal vertebrae I-IV, coccyx [coccygeal vertebrae I-IV], coccyx [vertebrae coccygeae I-IV], fused caudal vertebrae and fused caudal vertebral column, and 2 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001350, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: bony pelvis, dorsum, organism subdivision and postcranial axial skeleton.
• A kind of: bone element, irregular bone, organ and subdivision of vertebral column.
• inserts into: iliococcygeus muscle and pubococcygeus muscle.
• Develops from: embryonic post-anal tail.
• contains: coccygeal cornu of coccyx.
• connects: sacrococcygeal symphysis.

Questions

Where is the coccyx?

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

What does the coccyx connect to?

Part of: bony pelvis, dorsum, organism subdivision and postcranial axial skeleton.

Is the coccyx 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.