Meckelian groove - AbsoluteAstronomy.com

The Meckelian groove is an opening in the medial (inner) surface of the mandible

Mandible

The mandible pronunciation or inferior maxillary bone forms the lower jaw and holds the lower teeth in place...

(lower jaw) which exposes the Meckelian cartilage.

Modern eutherian mammals (which includes placental mammals) do not have a Meckelian groove.

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