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The quadrate bone is part of a skull in most tetrapods, including amphibians, sauropsids (reptiles, inclused birds) and early synapsids. In these animals it connects to the quadratojugal
Quadratojugal

The quadratojugal is a small jaw bone that is present in most amphibians, reptiles, and birds, but has been lost in mammals. It is connected to the jugal as well as other bones, though these may vary with species....
 and squamosal
Squamosal

The squamosal is a bone of the head of higher vertebrates. It is the principal component of the cheek region in the skull, lying below the temporal series and otic notch and bounded anteriorly by postorbital....
 in the skull, and forms part of the jaw joint (the other part is the articular
Articular

The articular bone is in the lower jaw of most tetrapods, including amphibians, sauropsids , birds and early synapsids. In these animals it is connected to two other lower jaw bones, the suprangular and the angular; and it forms the jaw joint by articulating with the quadrate bone of the skull....
 bone at the rear end of the lower jaw).

In snakes, the quadrate bone has become elongated and very mobile, and contributes greatly to their ability to swallow very large prey items.

In mammals the articular
Articular

The articular bone is in the lower jaw of most tetrapods, including amphibians, sauropsids , birds and early synapsids. In these animals it is connected to two other lower jaw bones, the suprangular and the angular; and it forms the jaw joint by articulating with the quadrate bone of the skull....
 and quadrate bones have migrated to the middle ear
Middle ear

The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the cochlea. The mammalian middle ear contains three ossicles, which couple vibration of the eardrum into waves in the fluid and membranes of the inner ear....
 and are known as the malleus
Malleus

The malleus or hammer is a hammer-shaped small bone or ossicles of the middle ear which connects with the incus and is attached to the inner surface of the eardrum....
 and incus
Incus

The incus or anvil is the anvil-shaped small bone or ossicles in themiddle ear. It connects the malleus to the stapes. It was first described by Alessandro Achillin of Bologna....
.






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The quadrate bone is part of a skull in most tetrapods, including amphibians, sauropsids (reptiles, inclused birds) and early synapsids. In these animals it connects to the quadratojugal
Quadratojugal

The quadratojugal is a small jaw bone that is present in most amphibians, reptiles, and birds, but has been lost in mammals. It is connected to the jugal as well as other bones, though these may vary with species....
 and squamosal
Squamosal

The squamosal is a bone of the head of higher vertebrates. It is the principal component of the cheek region in the skull, lying below the temporal series and otic notch and bounded anteriorly by postorbital....
 in the skull, and forms part of the jaw joint (the other part is the articular
Articular

The articular bone is in the lower jaw of most tetrapods, including amphibians, sauropsids , birds and early synapsids. In these animals it is connected to two other lower jaw bones, the suprangular and the angular; and it forms the jaw joint by articulating with the quadrate bone of the skull....
 bone at the rear end of the lower jaw).

In snakes, the quadrate bone has become elongated and very mobile, and contributes greatly to their ability to swallow very large prey items.

In mammals the articular
Articular

The articular bone is in the lower jaw of most tetrapods, including amphibians, sauropsids , birds and early synapsids. In these animals it is connected to two other lower jaw bones, the suprangular and the angular; and it forms the jaw joint by articulating with the quadrate bone of the skull....
 and quadrate bones have migrated to the middle ear
Middle ear

The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the cochlea. The mammalian middle ear contains three ossicles, which couple vibration of the eardrum into waves in the fluid and membranes of the inner ear....
 and are known as the malleus
Malleus

The malleus or hammer is a hammer-shaped small bone or ossicles of the middle ear which connects with the incus and is attached to the inner surface of the eardrum....
 and incus
Incus

The incus or anvil is the anvil-shaped small bone or ossicles in themiddle ear. It connects the malleus to the stapes. It was first described by Alessandro Achillin of Bologna....
. In fact paleontologists regard this modification as the defining characteristic of mammalian hearing structures.

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