Nasal Group – Facial Muscles

by Craig Canby, PhD

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    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.

    About the Lecture

    The lecture Nasal Group – Facial Muscles by Craig Canby, PhD is from the course Head and Neck Anatomy with Dr. Canby.

    Included Quiz Questions

    1. The nasalis and buccinator are innervated by the same facial nerve branch.
    2. The procerus muscle functions to raise the eyebrow.
    3. The nasalis muscle insertion is near the lateral orbit.
    4. The buccinator muscle pulls cheeks outward.
    5. The nasalis muscle functions to open the nasal aperture.

    Author of lecture Nasal Group – Facial Muscles

     Craig Canby, PhD

    Craig Canby, PhD

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