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The Glottic Larynx.

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0:01

Hello, everyone.

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Dr. Sidney Levy here.

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I'm continuing our discussion of the anatomy

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of the larynx and its subsites, and would

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like to concentrate on the glottis today.

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The glottis is one of the three subsites of the larynx,

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the others being the supraglottis and the subglottis.

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I have a pre-contrast T1-weighted

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scan here in three projections.

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There is an incidental hypopharyngeal mass,

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which we're not going to pay attention to for the

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moment, as it does not encroach on the larynx.

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So firstly, in the axial projection, I have chosen

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a slice at the level of the true vocal cords.

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And this is the laryngeal mucosa at that level.

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In the coronal projection,

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you can distinguish the vocal cords

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over a distance of one centimeter from their

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superior border to their inferior border here.

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So this area, with the true

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vocal cords, is the glottis.

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Above it, we have the false cords.

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This is supraglottis.

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The boundary of the glottis and the

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supraglottis are the laryngeal ventricles,

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which are at the level of this line here.

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Below the inferior margin of the true vocal cords,

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we have the subglottis, which extends as far as

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the inferior border of the cricoid cartilage.

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So just showing that again, the boundary between

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the supraglottis and the glottis is at the level

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of the laryngeal ventricles, which are here.

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And then, the glottis extends over a distance of one

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centimeter from its superior margin of the vocal

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cords to the inferior margin of the vocal cords.

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The last thing I would like to point

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out are some structures related to the

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glottis that you need to be familiar with.

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Firstly, at the level of the true

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vocal cords here, there is an anterior

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commissure and a posterior commissure.

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Then, there are the arytenoid cartilages,

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to which the vocal cords attach.

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And lastly, there are the thyroid

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cartilages, left and right.

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We are not quite yet into the cricoid cartilage,

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and the cricoid cartilage is more associated

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with the subglottis rather than the glottis.

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In our next vignette, we will discuss

2:42

the subglottis and its anatomy.

Report

Description

Faculty

Sidney Levy, PhD, MBBS

Radiologist and Nuclear Medicine Specialist

I-MED

Tags

Neuroradiology

Neuro

Neoplastic

MRI

Larynx

Head and Neck