Quadrate bone
Skull bone / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Quadrate bone?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
For other uses, see Quadrate (disambiguation).
See also: Evolution of mammalian auditory ossicles
The quadrate bone is a skull bone in most tetrapods, including amphibians, sauropsids (reptiles, birds), and early synapsids.
In most tetrapods, the quadrate bone connects to the quadratojugal and squamosal bones in the skull, and forms upper part of the jaw joint. The lower jaw articulates at the articular bone, located at the rear end of the lower jaw. The quadrate bone forms the lower jaw articulation in all classes except mammals.[1]
Evolutionarily, it is derived from the hindmost part of the primitive cartilaginous upper jaw.