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Actually, it's the lack of bones. Mammals' jaws have only the dentary (the lower jaw bone) and the squamosal (the upper jaw bone). Non-mammalian amniotes have two more bones in the skull: the articular in the lower jaw and the quadrate in the upper jaw. In them, the articular and the quadrate fuse to form the joint. In mammals, the articular is the malleus of the middle ear, and the quadrate is the incus.
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∙ 13y ago
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What is a sagittal crest?
A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull in many mammals and primates.
What bone protects the brain?
the bone that protects the brain is the skull.
The skull is composed of two main bone divisions and facial bone?
The cranial and facial bones
What skull bone encloses the ear canal?
The temporal bone of the skull encloses the ear canal.
What skull bone does the glabella belong to?
glabella belongs to FRONTAL BONE of the skull.
What is the bone that protects the skull?
The skull is a bone. The skull protects the brain.
Which bone can of the skull can move?
which bone of the skull canmove
What is a sagittal crest?
A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull in many mammals and primates.
What bone protects the brain?
the bone that protects the brain is the skull.
The skull is composed of two main bone divisions and facial bone?
The cranial and facial bones
Is snake skull made of bone or cartilage?
Both..The skull is basically bone.
What type of bone is the temporal?
A skull bone.
What bone moves your skull?
the jaw bone
What skull bone is the forehead?
Frontal bone
What bone in the skull is a flat bone?
sternum
What bone forms the back of the skull and joins skull along the lambdoidal suture?
Occipital bone
What skull bone encloses the ear canal?
The temporal bone of the skull encloses the ear canal.
