213
CHAPTER SEVEN
Skeletal System
Sometimes, fusion of the palatine processes of the maxillae is incom-
plete at birth; the result is a
cleft palate
. Infants with a cleft palate may
have trouble suckling because of the opening between the oral and
nasal cavities. A temporary prosthetic device (artiF
cial palate) may be
inserted into the mouth or a special type of nipple can be placed on
bottles, so the child can eat and drink until surgery can be performed
to correct the cleft.
Together these processes form a horseshoe-shaped
alveolar arch
(dental arch). Teeth occupy cavities in
this arch (dental alveoli). Dense connective tissue binds
teeth to the bony sockets (see chapter 17, p. 660).
2.
Palatine bones.
The
L
-shaped palatine (pal
ah-tı¯n)
bones
(f g. 7.26)
are located behind the maxillae.
The horizontal portions form the posterior section of
the hard palate and the fl
oor of the nasal cavity. The
perpendicular portions help form the lateral walls of the
nasal cavity.
Crista galli
Cribriform plate
Olfactory foramina
Optic canal
Foramen rotundum
Foramen ovale
Foramen lacerum
Internal acoustic
meatus
Jugular foramen
Frontal bone
Ethmoid
bone
Sphenoid bone
Temporal bone
Sella turcica
Parietal bone
Foramen magnum
Occipital bone
Foramen spinosum
Superior orbital ±ssure
FIGURE 7.24
±loor of the cranial cavity, viewed from above.
Midsagittal section
Sella turcica
Cribriform plate
of ethmoid bone
Sphenoidal sinus
Palatine bone
Maxilla
Frontal sinus
Nasal bone
Superior nasal
concha
Middle nasal
concha
Inferior nasal
concha
FIGURE 7.23
Lateral wall of the nasal cavity.
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