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Six bones of the head
- Ethmoid bone
- Frontal bone
- Parietal bone
- Occipital bone
- Temporal bone
- Sphenoid bone
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Ethmoid bone
- unpaired, in the center of skull, under and between the orbits
- shaped like a hollow box
- fits between the roof of the orbits
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Cribiform plate
roof of the ethmoid bone that has holes
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Superior and medial nasal conchae
shell-shaped internal surfaces of the lateral walls
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Frontal bone
- unapaired
- forms anterior surface of cranium and the roof of the orbits
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Parietal bones
two large curved rectangular bones forming the sides and top of skull
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Occipital bone
- unpaired
- forms back and lower skull
- articulates with cervical vertebral #1
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Foramen magnum
large hole in the base of the occipital bone for the spinal cord
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Temporal bones
- paired
- forms lateral base of skull
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Five parts of the Temporal bones
- squamous portion
- mastoid process
- petrous portion
- tympanic portion
- styloid process
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Squamous portion of the temporal bone
with the thin anterior projection is also known as the zygomatic process
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Mastoid process of the temporal bones
very porous and often considered as a sinus
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Petrous portion of the temporal bone
housing the middle and inner ears
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Tympanic portion of the temporal bone
forms part of the external auditory meatus
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Styloid process of the temporal bone
tooth-like downward projections
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Sphenoid bone
- large, unpaired
- described as shaped like a bat
- has two greater wings and two lesser wings
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Sella tursica of the sphenoid bone
- located between the two greater wings and middle of the superior surface
- houses the pituitary gland
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External pterygoid plates
two outer legs of the sphenoid bone
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Internal pterygoid plates
two inner legs of the sphenoid bone
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Hamulus
A hook-like projection at the bottom of each internal pterygoid plate
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