"Subperiosteally" Natural Recordings by Native Speakers
The term "subperiosteally" refers to something that occurs beneath the periosteum, a fibrous membrane covering the bones of the body. In medical or anatomical contexts, "subperiosteal" describes procedures or tissues located under this membrane, meaning they are outside the actual bone but still attached to it.
For example, a subperiosteal hematoma is a collection of blood under the periosteum, but above the bone surface, as a result of bleeding into this space.