Unit 4 - six bones of the head

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Six bones of the head
- Ethmoid bone
- Frontal bone
- Parietal bone
- Occipital bone
- Temporal bone
- Sphenoid bone
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
Cribiform plate

roof of the ethmoid bone that has holes
Superior and medial nasal conchae

shell-shaped internal surfaces of the lateral walls
Frontal bone
- unapaired
- forms anterior surface of cranium and the roof of the orbits
Parietal bones

two large curved rectangular bones forming the sides and top of skull
Occipital bone
- unpaired
- forms back and lower skull
- articulates with cervical vertebral #1
Foramen magnum

large hole in the base of the occipital bone for the spinal cord
Temporal bones
- paired
- forms lateral base of skull
Five parts of the Temporal bones
- squamous portion
- mastoid process
- petrous portion
- tympanic portion
- styloid process
Squamous portion of the temporal bone

with the thin anterior projection is also known as the zygomatic process
Mastoid process of the temporal bones

very porous and often considered as a sinus
Petrous portion of the temporal bone

housing the middle and inner ears
Tympanic portion of the temporal bone

forms part of the external auditory meatus
Styloid process of the temporal bone

tooth-like downward projections
Sphenoid bone
- large, unpaired
- described as shaped like a bat
- has two greater wings and two lesser wings
Sella tursica of the sphenoid bone
- located between the two greater wings and middle of the superior surface
- houses the pituitary gland
External pterygoid plates

two outer legs of the sphenoid bone
Internal pterygoid plates

two inner legs of the sphenoid bone
Hamulus

A hook-like projection at the bottom of each internal pterygoid plate

Author

jadnebalasca

184464

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Unit 4 - six bones of the head

Description

A&P of the ear and speech mech

Updated

11/19/2012, 7:40:19 PM

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