00:01
Let us now briefly look at the
neural vasculature of the pharynx
and then conclude our lecture with
the discussion of Waldeyer's Ring.
00:10
Let's first briefly discuss
the sensory innervation
of the pharyngeal mucosa.
00:16
The mucosa, the nasal pharynx
will receive its sensory innervation
from the maxillary division
of the trigeminal nerve.
00:25
The oral pharyngeal mucosa
will receive its sensory innervation
from the glossopharyngeal nerve.
00:33
And the mucosa, the laryngopharynx
will receive its sensory innervation
from the branches of the vagus,
chiefly the internal branch of
the superior laryngeal nerve,
and the recurrent laryngeal nerve.
00:47
And lastly, the autonomic
and motor innervation.
00:51
The pharynx comes from
the pharyngeal plexus,
which is formed by the
union of the vagus nerve,
glossopharyngeal nerve, and
the cervical sympathetic ganglia.
01:03
And again, the only exception
is the stylopharyngeus muscle,
which receives its
motor innervation
from a small motor branch
of the glossopharyngeal nerve.
01:16
The blood supply of the
pharynx is quite extensive.
01:22
The majority of the blood supply
is derived from the branches
of the external carotid artery.
01:28
These branches include:
the ascending pharyngeal arteries,
assending palatine,
and tonsillar branches
of the facial arteries,
the branches of the
maxillary artery
and the dorsal branches
of the lingual artery,
as well as superior and
inferior laryngeal arteries,
which are derived from
the subclavian artery.
01:55
The venous drainage of the
pharynx is accomplished
by a large venous plexus
located on the external posterior
aspect of the pharyngeal wall.
02:05
The superior part
of the venous plexus
drains into the pterygoid
plexus of veins,
which ultimately communicate
with the cavernous sinus.
02:16
The middle part of the
pharyngeal venous plexus
drains into the
internal jugular vein.
02:23
While the inferior part of
the pharyngeal venous plexus
drains directly into the
brachiocephalic vein.
02:30
With that we conclude
our brief overview
of the pharyngeal neurovasculature.
02:35
And now comes our last topic
which Waldeyer's Ring.