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Bones and cavities of the facial cranium

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Presentation on theme: "Bones and cavities of the facial cranium"— Presentation transcript:

1 Bones and cavities of the facial cranium


3 Anterior Skull frontal bone glabella supraorbital foramen
infraorbital foramen zygomatic bone mandibular symphysis maxillary bone alveolar fossa mental foramen mandible

4 Anterior Skull nasal bone perpendicular plate superior orbital fissure
middle nasal concha inferior nasal concha bone vomer bone

5 Paranasal Sinuses frontal sinus ethmoid sinus maxilary sinus
sphenoid sinus

6 Cranium frontal bone coronal suture parietal bone sagittal suture
lambdoidal suture occipital bone

7 Ventral Skull palatine process sphenoid bone palatine bone vomer bone
styloid process temporal bone mastoid process external occipital protuberance occipital bone

8 Occipital bone carotid canal jugular foramen occipital condyle
foramen magnum Occipital bone

9 Lateral Skull squamosal suture lacrimal bone temporal bone
external acoustic meatus mandibular condyle In mandibular fossa (TMJ joint) Lateral Skull

10 Lateral Skull zygomatic arch sphenoid bone coronoid process
sutural bone mastoid process styloid process ramus angle body mandible Lateral Skull

11 intenal acoustic meatus
cribriborm plate crista galli lesser wing greater wing optic canal sella turcica intenal acoustic meatus jugular foramen Internal Skull

12 Hyoid + external acoustic meatus temmporal mandibular joint Hyoid bone





17 ________ ________ Sagittal ________

18 Coronal Lambdoid Squamous

19 Overview of Skull Geography
Facial bones form the anterior aspect The cranial bones enclose the brain

20 Vault The cranial vault or calvaria forms the superior, lateral, and posterior aspects of skull The cranial base forming the inferior aspect of skull

21 Cranial Base Cranial base forms the skull’s inferior aspect
Three prominent ridges divide the base into fossae The brain rests on these cranial fossae completely enclosed by the cranial vault The brain occupies the cranial cavity

22 Cranium The 8 cranial bones include; 2 parietal, 2 temporal frontal, occipital, sphenoid, ethmoid Cranium is self- bracing allowing the bones to be thin, yet strong

23 Occipital bone Forms most of the posterior wall and base of skull
Articulates with parietal & temporal Joins w/ sphenoid in the cranial floor Forms internal walls of posterior cranial fossa

24 Occipital bone - Int. landmarks
Hypoglossal canal, Posterior cranial fossa

25 Temporal Bone Forms the infero-lateral aspects of the skull
Parts of the cranial floor Divided into four regions; squamous tympanic, mastoid, and petrous-(int)

26 Temporal Bone The internal petrous region contributes to the cranial base The petrous region and the sphenoid bone form the middle cranial fossa

27 Temporal Bone - landmarks
Zygomatic process Meets the zygomatic bone Forms the cheek Mandibular fossa Receives condyle of mandible

28 Temporal bones - landmarks
Stylomastoid foramen exit for facial nerve Carotid canal entrance for the carotid artery which supplies blood to cerebral hemispheres

29 Sphenoid bone Bone spanning the width of middle cranial fossa
Articulates as central wedge of all cranial bones Consists of central body and three processes; greater and lesser wings and pterygoid process (pos. view)

30 Sphenoid - landmarks Sella turcica (enclosure for pituitary gland)
Optic foramina (passage of optic nerves) Superior orbital fissure (Nerves III, IV, V enter orbit) Foramen rotundum & ovale (Cranial Nerve V to face) Foramen spinosum (Middle meningeal artery)

31 Ethmoid bone Forms most of the area between the nasal cavity & orbits of eyes Lies between nasal bones & sphenoid Complex shape gives rise to nasal septum, sinuses and cribiform plate

32 Ethmoid bone - landmarks
Cribiform plates Forms roof of nasal cavity Olfactory formina Olfactory nerves enter brain Crista galli Attachment of the dura mater which secures brain in cavity

33 Facial bones Consists of 14 bones w/ only mandible and vomer unpaired
Others include maxillae, lacrimals, nasals, zygomatics, inferior nasal conchae, and palatines (not pictured)

34 Mandible Forms the lower jaw Largest, strongest bone of the face
It has a body and two upwardly projecting sections called rami Houses lower dentition

35 Mandible - landmarks Mandibular angle Mandibular notch
Coronoid process Mandibular condyle Alveolar margin Mandible formina Mental formina Ramus of mandible

36 Maxillary bone Forms upper jaw and central portion of facial skeleton
Fused medially Articulates with all facial bones except mandible Upper dentition Forms 2/3 of hard palate of the mouth Zygomatic process Maxillary bone

37 Maxillary bones - landmarks
Alveolar margin Upper dentition Frontal process Forms lateral aspects of nose Zygomatic process Articulates with zygomatic bone Maxillary sinuses (Fig. 7.11)

38 Palatine bones The horizontal plates forms the posterior portion of hard palate Vertical plate forms part of the posterolateral wall of nasal cavity and a small portion of orbit

39 Palatine bones - landmarks
Horizontal plate Posterior section of hard palate Vertical plate Part of the posteriolateral walls of nasal cavity Orbital surface Part of inferior medial aspect of orbit

40 Vomer Forms part of the nasal septum Discussed with the nasal cavity

41 Vomer - landmarks Plow shape
Divides nasal septum into right and left parts

42 Inferior Nasal Conchae - Landmark
The Inferior nasal conchae is just one of three in the nasal cavity Superior and middle concha are on the Ethmoid bone

43 The Orbits

44 Paranasal sinuses Note positioning around nasal cavity

45 Paranasal sinuses Sphenoid sinus Frontal sinus Ethmoid sinus
Maxillary sinuses

46 Hyoid bone Body Neck muscle attachment Greater horn Lesser horn

47 TMJ

48 TMJ Capsule

49 TMJ Capsule

50 TMJ Motions

51 TMJ Motions

52 The Skull: Fractures Egg Shell Fracture of the Parietal bones.
Results from a fall or blunt force to the head

53 The Skull: Fractures Another example of an egg shell fracture.

54 Knife in Skull Above Orbit AP Projection

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