Bones of the skull

1. Bones of the Skull (pg 4)

2. Bones of the Skull Skull contains 22 bones (8 cranial and 14 facial)

3. Bones of the Skull Skull contains 22 bones (8 cranial and 14 facial) Cranial bones form the cranial cavity that surrounds and protects the brain

4. Bones of the Skull Skull contains 22 bones (8 cranial and 14 facial) Cranial bones form the cranial cavity that surrounds and protects the brain Facial bones form the framework of the face, support the entrances to the digestive and respiratory systems, and provide attachment points for the muscles involved in facial expression

5. Cranial Bones Frontal (1): Forms the forehead and the roofs of the eye sockets

6. Cranial Bones Frontal (1): Forms the forehead and the roofs of the eye sockets Parietal (2): Form the sides and roof of the cranial cavity.

7. Cranial Bones Frontal (1): Forms the forehead and the roofs of the eye sockets Parietal (2): Form the sides and roof of the cranial cavity. Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum, the hole through which the spinal cord passes

8. Cranial Bones Frontal (1): Forms the forehead and the roofs of the eye sockets Parietal (2): Form the sides and roof of the cranial cavity. Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum Temporal (2): Form the lower sides of the cranium. Contains the external auditory meatus (ear canal)

9. Cranial Bones Frontal (1): Forms the forehead and the roofs of the eye sockets Parietal (2): Form the sides and roof of the cranial cavity. Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum Temporal (2): Form the lower sides of the cranium. Contains the external auditory meatus (ear canal) Sphenoid (1): Spans the width of the cranial floor. Shaped like a butterfly

10. Cranial Bones Frontal (1): Forms the forehead and the roofs of the eye sockets Parietal (2): Form the sides and roof of the cranial cavity. Occipital (1): Forms the back and the base of the cranium. Contains foramen magnum Temporal (2): Form the lower sides of the cranium. Contains the external auditory meatus (ear canal) Sphenoid (1): Spans the width of the cranial floor. Shaped like a butterfly Ethmoid (1): Forms most of the bony area between the nasal cavity and the orbits. 3 parts: Crista galli (triangular upper portion), Cribiform plate (contains olfactory foramina), and Perpendicular plate (forms part of nasal septum)

11. Cranial sutures Sagittal suture: between the parietal bones

12. Cranial sutures Sagittal suture: between the parietal bones Coronal suture: between the frontal bone and the parietal bones

13. Cranial sutures Sagittal suture: between the parietal bones Coronal suture: between the frontal bone and the parietal bones Lambdoid suture: between the occipital bone and the parietal bones

14. Facial Bones Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth

15. Facial Bones Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth Palatine (2): L-shaped bones behind the maxillae. Form posterior part of hard palate

16. Facial Bones Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth Palatine (2): L-shaped bones behind the maxillae. Form posterior part of hard palate Nasal (2): Form the bridge of the nose

17. Facial Bones Maxillae (2): Form the upper jaw, floor of the orbits, and roof of the mouth. Contains the upper teeth Palatine (2): L-shaped bones behind the maxillae Nasal (2): Form the bridge of the nose Lacrimal (2): Located in the medial walls of the orbits (eye sockets)

18. Facial Bones Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch

19. Facial Bones Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch Inferior nasal conchae (2): Thin, curved bones that project into the nasal cavity

20. Facial Bones Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch Inferior nasal conchae (2): Thin, curved bones that project into the nasal cavity Vomer (1): Forms part of nasal septum

21. Facial Bones Zygomatic (2): Cheek bones. Joins with the temporal bone to form the zygomatic arch Inferior nasal conchae (2): Thin, curved bones that project into the nasal cavity Vomer (1): Forms part of nasal septum Mandible (1): Lower jaw. Articulates with the temporal bone at the temporomandibular (TMJ) joint. Contains the lower teeth and mental foramina

22. Other bones of the skull Auditory ossicles : malleus , incus , and stapes. Tiny bones in the middle ear

23. Other bones of the skull Auditory ossicles : malleus , incus , and stapes. Tiny bones in the middle ear Hyoid bone: U-shaped bone in the neck. Functions as a base for the tongue. Only bone in the body that does not articulate directly with another bone

24. Sinuses Air-filled cavities lined with mucous membranes. Reduce weight of skull

25. Sinuses Air-filled cavities lined with mucous membranes. Reduce weight of skull Located in the frontal, sphenoid, ethmoid , and maxillary bones