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5 Cards in this Set

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THYRO-ARY-TENOID-EUS

OIA

-INFEROMEDIAL FIBERS
E. Thyroarytenoideus

1. Origin: groove formed by the thyroid laminae, lateral to the attachments
of the vestibular and vocal folds

2. Insertion: lateral border of the arytenoid cartilage

3. Action: adducts the vocal ligament as the muscle thickens during con-
traction; decreases the tension of the vocal ligament as it draws the
arytenoid cartilage toward the thyroid cartilage

4. Its inferomedial fibers lie within the vocal fold, attach along the vocal
ligament, and comprise the vocalis muscle; the vocalis varies the length
and tension of the vibrating portion of the vocal ligament to produce
variations in pitch
THYRO-EPI-GLOTTICUS

OIAI
F. Thyroepiglotticus

1. Origin: groove formed by the thyroid laminae, superior to the thyro-
arytenoideus

2. Insertion: lateral margin of the epiglottis

3. Action: holds the epiglottis against the laryngeal aditus during degluti-
tion
MUSCLES OF THE LARYNX

INNERVATION
G. Innervation: recurrent laryngeal nerve, except the cricothyroid, which is
innervated by the external laryngeal nerve
NERVES OF THE LARYNX

SUPERIOR LARYNGEAL NERVE

-DESCENDS HOW?
-DIVIDES INTO?
IV. Nerves

A. Superior laryngeal nerve

1. Descends lateral to the pharynx; divides into the internal and external
laryngeal nerves posterosuperior to the tip of the greater cornu of the
hyoid, medial to the external carotid artery
NERVES OF THE LARYNX

SUPERIOR LARYNGEAL NERVE
-internal laryngeal nerve
A. Superior laryngeal nerve

2. Internal laryngeal nerve: penetrates the thyrohyoid membrane with the
superior laryngeal artery, in the gap between the middle and inferior
pharyngeal constrictors; descends within the mucosa of the piriform
recess and provides sensory innervation to the laryngeal mucosa supe-
rior to the vocal folds