Dental anatomy
The Head can be divided into 11 regions: 1. Frontal region 2. Parietal region 3. Temporal region l 4. Occipital region 5. Orbital region 6. Infraorbital region 7. Nasal region8. Oral region : Maxilla & Mandible 8 O l i M ill & M dibl 9. Zygomatic region 10. Buccal region g 11. Mental region
I‐ Bones of the skull
The human skull is divided into two sections:1. The Cranium:
Composed of 8 bones that cover & protect the brain 2. The Face: From the hair line to the chin Composed of 14 bones p 4
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Bones of the Cranium:
1. Frontal Bone:
Single bone Si l b Forms : the forehead, part of the floor of the cranium & most of the roof of the orbits Contains the two frontal sinuses (one located above each eye)
2. Parietal bones: 1. Paired bone2. Form the most of the roof & upper sides of the cranium 3. the two bones joined at the Sagittal suture at the midline of the skull 4. The line of articulation between the frontal & parietal bones is called the Coronal suture 5. In a newborn the Fontanelle is the soft spot where the sutures between the frontal & parietal bones have not yet closed
3. Occipital bone: g 1. Single bone2. Forms the back & base of the cranium 3. It joins the parietal bones at the Lambdoid suture 4. Temporal bones: 1. Paired bones 1 Paired bones 2. Forms the sides & base of the cranium 33. each one encloses an ear & contains the external auditory y meatus 4. The Mastoid process is a projection on it located just behind the ear, which composed of air spaces the behind the ear which composed of air spaces the communicate with the middle ear cavity 5. The Styloid process extends from the under surface of the temporal bone th t l b
5. Sphenoid bone: 1. Single bone2. made of the body and paired greater & lesser wings 3. It forms the anterior part of the base of the skull 3 It forms the anterior part of the base of the skull 4. The pterygoid process, which extends downward ...
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