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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

Sella turcica

Sphenoidal sinus

Palatine bone Maxilla

Optic canal

Foramen rotundum

Foramen ovale Foramen lacerum

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

Occipital 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.

3 7fi

Sinuses of

the Cranial

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