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 28 bones in the skull  2 major divisions: Cranium and Face  Cranium: frontal, 2 parietal, 2 temporal, occipital, sphenoid and ethmoid  Face: 2 maxillae,

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Presentation on theme: " 28 bones in the skull  2 major divisions: Cranium and Face  Cranium: frontal, 2 parietal, 2 temporal, occipital, sphenoid and ethmoid  Face: 2 maxillae,"— Presentation transcript:

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2  28 bones in the skull  2 major divisions: Cranium and Face  Cranium: frontal, 2 parietal, 2 temporal, occipital, sphenoid and ethmoid  Face: 2 maxillae, 2 zygomatic, 2 nasal, madible, 2 lacrimal, 2 palatine, 2 inferior nasal conchae, and the vomer

3  Frontal Bone: forehead and anterior portion of the top of the cranium  Contains Sinuses (frontal sinus) and similar sinuses in the sphenoid, ethmoid and maxillae (called Paranasal Sinuses)  Frontal Sinus joins with the parietal bone in the CORONAL SUTURE

4  Parietal Bone: two bones form the topside of the cranium  Form joints with several bones:  Lamboidal Suture : with the occipital bone  Squamous Suture : with the temporal bone and part of the sphenoid  Coronal Suture : with the frontal bone

5  Temporal Bones: lower sides of the cranium and part of the skull floor  House the middle and inner ear structures  Mastoid Sinus is contained here

6  Occipital Bone: lower, posterior portion of the skull  Forms immovable joints with 3 other cranial bones (parietal, temporal and sphenoid)  Forms a movable joint with the first cervical vertebrate  Foramen Magnum: hole where spinal cord enters cranial cavity

7  Sphenoid Bone: located in central portion of cranium floor  Serves as an anchor for the frontal, parietal, occipital and ethmoid bones  Forms portion of orbits  Sphenoid Sinuses

8  Ethmoid Bones: anterior to the sphenoid and posterior to the nasal bones  Makes up anterior cranial floor, medial walls of orbits, upper parts of the nasal septum, sides of nasal cavity and parts of the nasal roof

9  Maxillae: (2 bones) articulate with each other  Forms floor of the orbits, roof of the mouth, floor and walls of the nose  Each maxilla contains a Maxillary Sinus (largest of the paranasal sinuses)

10  Mandible: single bone  Largest, strongest bone of the face  Articulates with the temporal bone in the only movable joint of the skull

11  Zygomatic: shapes the cheek (AKA malar bone)  Forms the outer margin of the orbit, and the zygomatic arch  Articulates with maxillary, temporal, frontal and sphenoid bones

12  Nasal Bones: gives shape to the nose  Forms upper bridge of the nose  Septal Cartilage forms lower portion of the nose  Lacrimal Bone: has a groove for the tear duct (nasolacrimal duct)  Sidewall of the nasal cavity and medial wall of orbit

13  Orbital cavities contain eyes and associated muscles; important blood vessels and nerves; and lacrimal duct  Orbital walls are generally very thin and fragile  Palatine Bones form the base of the orbits and the roof of the hard palate

14  Very different from adult skulls  Placement of bones allows for change of shape during birth  Fontanels: allow for molding of head shape during birth; rapid brain development without increasing intracranial pressure (do not close until adult size is reached)


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