00:01
We have reached the last bone on our
agenda, which is the palatine bone.
00:06
This bone is quite obscured from sight as it is
wedged in between the maxilla and the sphenoid bones.
00:15
The palatine bone contributes to the formation
of quite a few structures including the floor,
and the lateral wall, the nose,
the floor of the ocular orbit,
the posterior aspect of the osseous hard
palate and to the inferior orbital fissure.
00:33
Once again, similarly to the
other bones we have discussed,
let's divide up the palatine
bone into various components.
00:41
Thus, the palatine bone has two plates,
the horizontal and the perpendicular,
as well as three processes
pyramidal, orbital and sphenoidal.
00:53
The horizontal plates of the
palatine bone have two surfaces,
the superior nasal and inferior palatine surfaces.
01:03
Medially,these surfaces possess the nasal
and the Palatine crest respectively,
while the nasal crest articulates with
the bones of the nasal septum superiorly.
01:15
The anterior border the horizontal plates articulates
with the Palatine processes of the maxilla
to form the hard osseous palate.
01:24
Posteriorly, these plates spin out and offer points
of insertion for certain muscles of articulation.
01:32
Laterally, the horizontal plates
meet with the perpendicular plates
and at their junction is located
the greater palatine groove.
01:41
The perpendicular plates are also two thin
plates, which also possess two surfaces:
the nasal and maxillary.
01:50
The nasal surface of the perpendicular plate
possesses two crests, the conchal and ethmoidal.
01:57
The nasal surface of the perpendicular plate
contributes to the formation of the inferior, middle
and part of the superior nasal meatuses.
02:07
The maxillary surface mainly articulates
with the nasal surface of the maxilla
and contributes to the posterior part
of the medial wall, the maxillary sinus.
02:15
Now the final portion, the
processes of the palatine bone.
02:19
As I mentioned before, the
palatine bone has three processes.
02:24
The first process, the pyramidal
process is triangular in shape,
and articulates with the pterygoid
plates of the sphenoid bone
and with the maxillary tuberosity anteriorly.
02:35
The orbital process has three articular
surfaces which include the maxillary surface,
spenoidal surface and ethmoidal surface.
02:44
And then we have two non-articular surfaces:
the orbital surface which contributes
to the formation of the orbital floor
and the lateral surface which forms the
lower margin of the inferior orbital fissure.
02:59
And lastly, the sphenoidal process which articulates
with the pterygoid plates of the sphenoid, the vomer,
and also contributes to the formation of
the roof and the lateral wall of the nose.