00:01
The procerus is shown here,
right above the nose
in it too is a paired muscle.
00:10
The origin is from the fascia,
the aponeurosis
that covers the nasal bone,
as well as the associated
lateral nasal cartilage.
00:21
Insertion is to the skin
of the inferior forehead
between the eyebrows
as you would predict
based on its location.
00:32
Innervation is via the
temporal and zygomatic branches
of the facial nerve.
00:39
Buccal innervation has been
described in some instances,
but really the
take home innervation here
is the temporal and zygomatic
branches of your facial nerve.
00:50
When this muscle is shortening, it
will be pressed the medial eyebrow
and it also then will wrinkle
the skin over the nasal dorsum.
01:01
And this action will convey
a look of dislike or disdain.
01:07
Now, we're more medial here
and we have a muscle that is
related specifically to the nose
this is the nasalis.
01:16
And you can see the both muscles
right and left here
highlighted in red.
01:22
This muscle is going to originate
from the maxilla.
01:27
And insertion will be to the skin
of the nasolabial and alar folds.
01:36
This particular muscle is going to
be innervated by the buccal branch
of the facial nerve.
01:42
And then the action of the nasalis
is to compress the nasal aperture.
01:48
And it also will pull the alar parts
of the nose downward and laterally.
02:00
Our next muscle
is highlighted here in red.
02:02
And this is our buccinator.
02:06
Its bony origin is
from the mandible.
02:09
The alveolar processes of the
maxilla, as well as the mandible.
02:17
And then lastly we have
the pterygomandibular raphe
serving as another point of origin.
02:25
Insertion of the buccinator
is to the angle of the mouth,
and it has insertion
into the orbicularis oris
that will be the
center of the mouth.
02:39
Buccinator buccal branch
of facial nerve
those go together,
so no surprise here
on the innervation
The actual of this muscle will help
press the cheek against the teeth.
02:52
This is very very important
when chewing
as it will push the food
so that it is crushed by the teeth
and not accumulate between
the teeth in the cheek.
03:05
And it also will help
to resist distension.
03:10
And this is very, very important
when blowing.
03:14
You don't want the buccal region
to dilate out.
03:18
You want to resist
that distension,
so the force of blowing is
going to go into the atmosphere
or if you're blowing into a trumpet,
or a similar music, or instrument,
you can get it to really
really sing to your liking.