19. Laryngeal Inlet
Faces backward and
upward and opens into
the laryngeal part of the
pharynx
The opening is bounded:
• Anteriorly: by the
upper margin of
epiglottis
• Posteriorly & below by
arytenoid cartilages
• Laterally by
aryepiglottic folds
E
CU
CO
AEF
A
20.
21. Laryngeal Cavity
Extends from
laryngeal inlet to
lower border of the
cricoid cartilage
Narrow in the region
of the vestibular folds
(rima vestibuli)
Narrowest in the
region of the vocal
folds (rima glottidis)
Rima
vestibu
li
Rima
glottidi
s
22. Laryngeal Cavity
• Divided into three
parts:
A. Supraglottic part,
the part above the
vestibular folds, is
called the
vestibule
B. The part between
the vestibular &
the vocal folds, is
called the
ventricle
C. Infraglottic part,
the part below the
A
B
C
41. Tensors of the vocal cords
cricothyroid muscle :
42. Internal portion of thyro- arytenoid ( vocalis ) m. :
A specialized portion of the lower and deeper fibers of the thyro-
arytenoid muscle .
It forms a triangular bundle.
Some of its fibers gain its attachment to the vocal ligament.
It is known as the internal tensor .
44. Opener of laryngeal inlet :
Fibers of thyro-epiglottic muscle is apart of the thyro-arytenoid muscle widens the
inlet of the larynx by pulling the ary-epiglottic folds slightly apart .
45. Closers of the laryngeal inlet :
Oblique portion of inter-arytenoid muscle is superficial to the transvers portion .
The two bundle of fibers cross each other ; closes the rima glttis .
Ary-epiglotic muscle is prolongation of the oblique fibers of inter- arytenoid muscle
in to the ary- epiglotic fold .
All intrinsic muscles of the larynx are supplied by recurren laryngeal nerve except
Crico-thyroid m. which is supplied by external laryngeal nerve ..
