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Figure
(a) The sphenoid bone viewed from above. (b) Posterior view. (The sphenoidal sinuses are within the bone and are not visible in this representation.)
Perpendicular plate
Crista galli Cribriform plate
Ethmoidal sinuses Orbital surface
Perpendicular plate
Crista galli Cribriform plate
Ethmoidal sinuses Orbital surface
Superior nasal concha
Middle nasal concha
Perpendicular plate
Transverse section
Figure 7.24
The ethmoid bone viewed (a) from above and (b) from behind.
Transverse section
Figure 7.24
The ethmoid bone viewed (a) from above and (b) from behind.
Superior nasal concha
Middle nasal concha
Perpendicular plate
- Midsagittal section
Figure 7.25
Lateral wall of the nasal cavity.
Frontal sinus
Nasal bone
Superior nasal concha
Middle nasal concha
Inferior nasal concha
Frontal sinus
Nasal bone
Superior nasal concha
Middle nasal concha
Inferior nasal concha
Cribriform plate of ethmoid bone
Palatine bone Maxilla
Cribriform plate of ethmoid bone
Sphenoidal sinus
Palatine bone Maxilla
Optic canal
Foramen rotundum
Internal acoustic meatus
Jugular foramen Foramen magnum
Internal acoustic meatus
Jugular foramen Foramen magnum
Crista galli Cribriform plate Olfactory foramina
Frontal bone Sphenoid bone
Sella turcica
Temporal bone Foramen spinosum
Parietal bone
Figure 7.26
Floor of the cranial cavity viewed from above.
Figure 7.26
Floor of the cranial cavity viewed from above.
Crista galli Cribriform plate Olfactory foramina
Frontal bone Sphenoid bone
Sella turcica
Temporal bone Foramen spinosum
Parietal bone
Occipital bone
Ethmoid bone together they form the keystone of the face, since all the other immovable facial bones articulate with them.
Portions of these bones comprise the anterior roof of the mouth (hard palate), the floors of the orbits, and the sides and floor of the nasal cavity. They also contain the sockets of the upper teeth.
Inside the maxillae, lateral to the nasal cavity, are maxillary sinuses. These spaces are the largest of the sinuses, and they extend from the floor of the orbits to the roots of the upper teeth. Figure 7.27 shows the locations of the maxillary and other sinuses. Table 7.6 displays a summary of the sinuses.
Frontal sinus Ethmoidal sinus
Sphenoidal sinus Maxillary sinus
Frontal sinus Ethmoidal sinus
Sphenoidal sinus Maxillary sinus
Figure 7.27
Locations of the sinuses.
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