Page 79 - Edited - Webster HEAD AND NECK - part 2-Merge PDF

HN 271

COVERINGS OF THE QUADRANGULAR MEMBRANE HN 271
(I) CORONAL SECTION (SCHEMATIC) as (A)-(A),
HN 269 Fig.I
QUADRANGULAR
MEMBRANE ENTRANCE ARY-EPIGLOTTIC
(INLET) FOLD
OF PIRIFORM Since the quadrangulas membranes
THYROID LARYNX FOSSA. have both upper & lower borders free
LAMINA on anterior & posterior borders fixed,
covering them with
MUCOSA
SURMUCOSA mucome membrane & Submucosa
(VASCULAR WITH SMALL creates two MORE PAIRS OF
MUCOUS GUANDS) FOLDS RUNNING FROM
VESTIBULAR SACCULE ANTERIOR TO POSTERIOR. The
("FALSE WITH LARGE
VOCAL” MUCOUS first (superior) pair are the ARY-
FOLDS GLANDS EPIGLOTTIC FOLDS (they run from
the arytenoid certilages belind to the
lateral borders of the epiglottis in
SINUS SINUS
CRICO- front) which MARK THE
THYROID GLOTTIS LARYNGEAL INLET, The second
MUSCLE (inferior) pair are The VESTIBULAR
(SHEET (false vocal") folds.
174) VOCIAL
FOLDS

CRICOID
CARTILAGE
The orientation of the latter with respect to the VOCAL
FOLDS creates a pair of blind pockets on each side of the laryngeal cavity: these
are the LARYNGEAL SINUSES (or ventricles"). "From each sinus, a pocket
extends upwords into the submocosa: there are The SACCULES and into each
discharge numeros, large MUCOUS GLANDS. The mucous from these lubricates
the VOCAL Folds (which have is glands of their own): after a prolonged bout of
talking, one's voice literally dries up as the glandular secretion fails

EPIGLOTTIS HYOID BONE The MUCOUS MEMBRANE &
NOTE that "1st SUBMUCOSA also clove the space
PROBE" (270, Fig THYRO-HYOID between the laseral hirface of each
I) CANNOT NOW MEMBRANE quadrangulas membrane of The
PASS.
ARY-EPIGOTTIC modial surface of the thyoid lamina,
FOLD foring two pockets: the inferior
THYROID porket is the roof of the larynged
THYROID LAMINH. simed; the superior one is The
CARTILAGE PIRIFORM PIRIFORM FOSSA. Each
(cut) FOSSA Piriforum fossa is a gullay ruming
VESTIBULAR ARYTENOD downwards & backwards lateral to the
FOLD CARTILAGE
SINUS cryepiglotic fold and to ⸫ the laryngeal inlet
CRICOID Because the submucoda is present, the
VOCAL
FOLD LUMINA entire Lining of the larynged
appears pink, EXCEPT for the Vocal Folds
K.E.W.
(II) INTERIOR OF RIGHT HALF OF LARYNX
WITH MUCOUS MEMBRANE
cf-HN270 Fig (I)