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The Larynx | Human Anatomy

Vinh Truong's Presentation on the Larynx
by

Christine Nguyen

on 25 July 2013

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Transcript of The Larynx | Human Anatomy

The length determines the range of voice. vocal folds produce sounds than vocal folds.
The Larynx AKA the Voice Box
* Conducts air
* Produces sound
Sound Production
The larynx is supported by a framework of
cartilages held together by ligaments and muscles:
where's it located?
* It connects the pharynx to the trachea
The Larynx
what's its function?
The Larynx
Abduction vs. Adduction
The Vocal Folds
Structures in Sound Production
Vocal Ligaments
Inferior ligaments that extend from the posterior surface of the thyroid cartilage to the arytenoid cartilages.
These ligaments, covered in mucous,
are called , which are
" ", since they
produce sound when air
passes through.
vocal folds
true vocal cords
Vestibular Ligaments
Superior ligaments that extend from the posterior surface of the thyroid cartilage to the arytenoid cartilages.
Together with the mucosa, these
ligaments are called ,
which are known as " ".
It has no function in sound
production, and serves to
protect the vocal
cords.
vestibular folds
false vocal cords
Abduction and adduction occurs when intrinsic muscles of the larynx cause the to pivot.
arytenoid cartilage
Rima Glottidis
The rima glottidis is the opening between
the vocal folds. The opening
when the folds are abducted; and it
when the folds are
adducted. The term
refers to both the RG and
vocal folds.
widens
narrows
glottis
a pictorial view
Vibration of the vocal folds occurs when air is forced through the rima glottidis, which results in .
sound production
The nonkeratinized stratified squamous epithelium lining the vocal folds withstands this abrasive contact between the two vocal folds and their vibrational activity during sound production.
A detailed look at
The characteristics of sound depends on the
, , & of the vocal folds.
length
tension
position
Longer
lower
shorter
LENGTH
TENSION
The amount of tension on the vocal folds determines the
of the voice. tension causes the
produces higher sounds; tension lowers pitch.
pitch
Increasing
less
FORCE OF AIR
The force of air passing through the vocal folds
determines the of sound.
* A lot of air forced = LOUD; Little
air forced = SOFT
loudness
what are its structures?
The Larynx
by vinh truong
THYROID CARTILAGE
The largest cartilage forming only the anterior and lateral walls of the larynx.
THYROHYOID MEMBRANE
Dense connective tissue band that attaches the superior border of the thyroid cartilage to the hyoid bone.
LARYNGEAL PROMINENCE (Adam's Apple)
The V-shaped anterior projection of the thyroid cartilage.
CRICOID CARTILAGE
Ring-shaped cartilage that forms the inferior base
of the larynx and connects to the trachea inferiorly.
CRICOTHYROID LIGAMENT
Dense regular connective tissue band that attaches the cricoid cartilage to the inferior edge of the thyroid cartilage.
EPIGLOTTIS
Large, leaf- or spoon-shaped structure formed of elastic
cartilage. It is attached to the thyroid cartilage and
projects superiorly into the pharynx.
The Larynx
The Structures, Continued
ARYTENOID
CARTILAGES
A pair of pyramidal shaped cartilages that rest on the superoposterior border of the cricoid cartilage.
A pair of cartilages that are attached to the superior surface of the arytenoid cartilages.
CUNEIFORM
CARTILAGES
A pair of cartilages that do not attach to any other cartilages. They are supported by the aryrepiglottic fold.
CORNICULATE
CARTILAGES
ARYEPIGLOTTIC FOLD
The mucosa-covered connective tissue sheet that supports the cuneiform cartilages.
It extends between the lateral sides of each arytenoid cartilage and the epiglottis to
support some of the laryngeal soft tissue structures.
INTRINSIC MUSCLES
EXTRINSIC MUSCLES
Laryngeal muscles that attach
to the arytenoid and
corniculate cartilages. It
regulates tension
on vocal folds.
Infrahyoid muscles that attach
the hyoid bone to the
thryoid cartilage. Helps
stabilize and move
larynx.
Full transcript