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The Larynx | Human Anatomy
Transcript of The Larynx | Human Anatomy
The Larynx AKA the Voice Box
* Conducts air
* Produces sound
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
what's its function?
Abduction vs. Adduction
The Vocal Folds
Structures in Sound Production
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
true vocal cords
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
false vocal cords
Abduction and adduction occurs when intrinsic muscles of the larynx cause the to pivot.
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
a pictorial view
Vibration of the vocal folds occurs when air is forced through the rima glottidis, which results in .
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.
The amount of tension on the vocal folds determines the
of the voice. tension causes the
produces higher sounds; tension lowers pitch.
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
what are its structures?
by vinh truong
The largest cartilage forming only the anterior and lateral walls of the larynx.
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.
Ring-shaped cartilage that forms the inferior base
of the larynx and connects to the trachea inferiorly.
Dense regular connective tissue band that attaches the cricoid cartilage to the inferior edge of the thyroid cartilage.
Large, leaf- or spoon-shaped structure formed of elastic
cartilage. It is attached to the thyroid cartilage and
projects superiorly into the pharynx.
The Structures, Continued
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.
A pair of cartilages that do not attach to any other cartilages. They are supported by the aryrepiglottic 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.
Laryngeal muscles that attach
to the arytenoid and
corniculate cartilages. It
on vocal folds.
Infrahyoid muscles that attach
the hyoid bone to the
thryoid cartilage. Helps
stabilize and move