I all this is dr. o and we're going to move back
into a little bit of osteology to cover the pterygoid plates and the hamulus
so specifically what are the pterygoid plates which muscles attach here and
what function does the pterygoid hamulus serve
so let's start here with the lateral pterygoid plate this is something that might be a little bit
more familiar as we've talked about it with the medial and lateral pterygoid muscle attachments so
we see here on this image that lateral surface is where we find the attachment of lateral pterygoid
muscle on the lateral pterygoid plate this is also a boundary for the in for temporal fossa
so you can imagine the space lateral to this being that in for temporal fossa now the medial surface
of the lateral pterygoid plate over here in green is the attachment for medial pterygoid muscle it's
also part of this pterygoid fossa which is kind of this indentation we see between the lateral
pterygoid plate and the medial pterygoid plate so the medial pterygoid plate is longer and we
also see that it's associated with the pharynx so here is our maxilla and the hard palate and
the Palatine portion of the hard palate that we can see into our nasal cavity and then this
space that's coming out toward us is the pharynx paraglide plate is an attachment point for the
superior pharyngeal constrictor now the process can have this portion right here that extends
inferiorly from the medial pterygoid plate is called the pterygoid hamulus now this acts as
an attachment point for pterygomandibular raphe which is a condensation of pharyngobasilar fascia
and it acts as a pulley for the tensor veli palatini muscle and it's tendon so the
tensor veli palatini muscle will sit about here and then it's tendon will run medially
toward the palatine aponeurosis so this kind of sharp angle is as that muscle wraps around the
pterygoid hamulus so we'll see more about these the muscles of the palate in a future
session but keep in mind that are going hamulus when we're moving forward into that region
here we're gonna start with just an isolated sphenoid bone and I want to
note here is the lesser wing the greater wings down there I also see the optic canals and the
hypophyseal fossa here so we're kind of looking at it as we've seen it from the
cranial cavity now we're going to turn it a little bit and now we're seeing kind of a
posterior view of it so here projecting inferiorly are those pterygoid plates
in blue we see outlined the lateral surface of the lateral pterygoid plate and then in
green the medial surface of the lateral pterygoid plate
here in pink we see is the projection of this longer medial pterygoid plate
projecting down is the pterygoid ham ulis
now in the context with the rest of the skull
we can see where these sit in relation to the area of the info temporal fossa
remember that lateral plate is one of is the medial boundary of it and kind of the region
of the nasal cavity in the pharynx back here where then this would continue down
you all right so let's do a little bit of review and ask now which muscle attaches
to the medial pterygoid plate is it the medial pterygoid muscle the lateral pterygoid muscle
or the superior pharyngeal constrictor muscle so take a second choose your answer and when
you're ready what did you say so the correct answer here is a superior pharyngeal constrictor
so when we hear medial pterygoid plate we're not thinking about those pterygoid muscles
the medial surface of the lateral pterygoid plate is where the medial pterygoid muscle
attaches and in the lateral surface of the lateral pterygoid plate so where the lateral
pterygoid muscle attaches now this medial pterygoid plate serves then the attachment
for the superior heal constructor keep in mind the lateral pterygoid plate is
more so associated with the info temporal fossa whereas the medial is more associated with the
pharynx so great job thank you so much for your attention and I will see you in the next video