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Skull SHANDONG UNIVERSITY Liu Zhiyu. Skull The skull is composed of 23 bones, which may be divided into the cerebral craniumand facial cranium.

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Presentation on theme: "Skull SHANDONG UNIVERSITY Liu Zhiyu. Skull The skull is composed of 23 bones, which may be divided into the cerebral craniumand facial cranium."— Presentation transcript:

1 Skull SHANDONG UNIVERSITY Liu Zhiyu

2 Skull The skull is composed of 23 bones, which may be divided into the cerebral craniumand facial cranium

3 Skull Cerebral cranium (8) ―larger, upper and posterior part, contains and protects the brain Single bones: include  frontal bone  ethmoid bone  sphenoid bone  occipital bone Paired bones : include  temporal bone  parietal bone

4 Skull Bones of facial cranium (15) ―smaller, lower, and anterior part, contains bones that surrounded the eye, nose and mouth Single bones: include  mandible  vomer  hyoid bone Paired bones: include  maxilla  nasal bone  lacrimal bone  palatine bone  zygomatic bone  inferior nasal concha

5 Bones of facial cranium

6 Frontal bone Zygomatic bone Nasal bone Maxilla Mandible Sphenoid bone parietal bone Temporal bone Occipital bone

7 Mandible Body of mandible Superior border: alveolar arch Inferior border: base of mandible Outer surface: mental protuberance Mental foramen Inner surface: mental spine Digastric fossa

8 Mandible Ramus Mandibular notch Coronoid process Condylar process  head of mandible  neck of mandible Mandibular foramen Mandibular lingula Angle of mandible Masseteric tuberocity

9 The skull as a whole

10 Skull viewed from above (superior view) Bones:  frontal bone  paired parietal bone  occipital bone Sutures:  Coronal suture  Sagittal suture  Lambdoid suture parietal tuber parietal foramen

11 Skull viewed from above (superior view) Internal surface of the calvaria sulcus for superior sagittal sinus granular foveola arterial grooves

12 Skull viewed from behind External occipital protuberance Superior nuchal line Inferior nuchal line

13 Internal view of base of skull Base of skull forms three fossae Anterior cranial fossa Middle cranial fossa Posterior cranial fossa

14 Internal view of base of skull

15 Anterior cranial fossa Formed by orbital part of frontal bone, cribriform plate of ethmoid, and lesser wings of sphenoid Structures: frontal crest foramen cecum crista galli cribriform plate cribriform foramina

16 Meddle cranial fossa Formed by the body and greater wings of sphenoid, petrous part of temporal Structures: Body of sphenoid bone Hypophysial fossa Optic canal Anterior clinoid process Tuberculum sellae Dorsum sellae Posterior clinoid process Sella turcica

17 Meddle cranial fossa Carotid sulcus Superior orbital fissure Foramen rotundum Foramen ovale Foramen spinosum Sulcus for middle meningeal artery Foramen lacerum Internal opening of carotid canal Trigeminal impression Arcuate eminence Tegmen tympani

18 Posterior cranial fossa Formed by occipital and the petrous part of temporal Structures: foramen magnum clivus internal opening of hypoglossal canal internal occipital protuberance internal occipital crest sulcus for transverse sinus sulcus for sigmoid sinus jugular foramen internal acoustic pore internal acoustic meatus

19 Skull viewed from below (inferior view) alveolar arch bony palate median palatine suture incisive foramina incisive canal greater palatine foramen posterior nasal apertures pterygoid process occipital condyle external opening of hypoglossal canal external opening of carotid canal styloid process stylomastoid foramen mandibular fossa articular tubercle

20 Lateral view of the skull External acoustic pore Mastoid process Zygomatic arch Temporal fossa Pterion Superior temporal line

21 Lateral view of the skull Infratemporal fossa pterygomaxillary fissure pterygopalatine fossa sphenopalatine foramen

22 Skull viewed from the front (anterior view) Frontal region: frontal squama frontal tuber superciliary arch glabella

23 Orbit pyramid-shaped paired cavities Base: supraorbital notch infraorbital foramen Apex: optic canal Walls  Superior: fossa for lacrimal gland  Medial: fossa for lacrimal sac  Inferior: infraorbital fissure  infraorbital groove  infraorbital canal

24 Bony nasal cavity Roof: cribriform plate of ethmoid Floor: bony palate Medial wall ― bony septum of nose Lateral wall  Superior, middle and inferior nasal conchae  Superior, middle and inferior nasal meatus (underlying each concha)  Sphenoethmoidal recess  above superior nasal concha Anterior ―piriform aperture Posterior ―posterior nasal aperture communicates with pharynx

25 Paranasal sinuses Frontal sinus  Lies in frontal bone, deep to superciliary arch  Drain to anterior part of middle meatus

26 Paranasal sinuses Maxillary sinus  Largest paired sinus, lie in the body of maxilla;  Opening into middle nasal meatus

27 Paranasal sinuses Ethmoidal cellules  Lie in ethmoidal bone, contains large number of air cells, divided into anterior, middle and posterior groups  Anterior and middle groups drain into middle nasal meatus, while posterior group drains into superior nasal meatus

28 Paranasal sinuses Sphenoidal sinus  Lies in body of sphenoid bone  Drain into sphenoethmoidal recess

29 General characters of the skull at birth The skull at birth is large in proportion to rest of the skeleton ―1/4 (adult 1/7) The facial portion equals about one eight that of the cranium in size, whereas in adult it is one half (1/4) Many bones consist of more than one piece

30 General characters of neonatal skull Cranial frontanelles ― unossified membrane between the bones at the angles of parietal Anterior frontanelle ―closes during middle of 2nd year Posterior frontanelle ―closes by the end of 2nd month after birth Mastoid fontanelle Sphenoidal fontanelle

31 Anteroposterior radiograph of skull.

32 Lateral radiograph of skull.

33 Horizontal CT at level of upper part of ramus of mandible showing relationships of the pterygoid plates.


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