Larynx Flashcards
Origin and insertion of cricothyroid
Origin: anterior and lateral asects of arch of cricoid cartilage
Insertion: inferior margin and inferior horn of thyroid cartilage
Innervation of cricothyroid
external branch of superior laryngeal nerve
action of cricothyroid
stretches vocal fold
increases pitch of the voice
Origin and insertion of posterior cricoarytenoid
origin: posteiror surface of lamina of cricoid cartilage
insertion: muscular process of arytenoid cartilage
Innervation of posterior cricoarytenoid
inferior laryngeal nerve
action of posterior cricoarytenoid
abducts vocal fold
opens airway more to faciliate breathing
Origin and insertion of lateral cricoarytenoid
origin: superior border of arch of cricoid cartilage
insertion: muscular process of arytenoid cartilage
innervation of lateral cricoarytenoid
inferior laryngeal nerve
action of lateral cricoarytenoid
adducts vocal fold
closes airway partially or completely depending upon the action of other muscles
origin and insertion of thyroarytenoid
origin: posteiror surface of thyroid cartilage at midline angle
insertion: anterolateral border and vocal process of arytenoid cartilage
innervation of thyroarytenoid
inferior laryngeal nerve
action of thyroarytenoid
relaxes vocal fold
lowers pitch of the voice
Origin and insertion of transverse and oblique arytenoid
Origin: one arytenoid cartilage
Insertion: opposite arytenoid caritlage
Innervation of the transverse and oblique arytenoid
inferior laryngeal nerve
action of the transvers and oblique arytenoid
closes intercarilaginous portion of rima glottidis
important for coughing
origin and insertion of vocalis
origin: vocal process of arytenoid cartilage
insertion: vocal ligaments
innervation of vocalis
inferior laryngeal nerve
action of vocalis
fine tunes tension of vocal ligament
affects the pitch of the voice
What provides GSA innervation and what structures are present in the INLET?
GSA: CN X via internal branch of superior laryngeal nerve
Structures: mucosa over epiglottis, aryepiglottic fold, mucosa of interarytenoid notch
What provides GSA innervation and what structures are present in the VESTIBULE?
GSA: CN X via internal branch of superior laryngeal nerve
Structures: mucosa over quadrangular membrane, vestibular fold
What provides GSA innervation and what structures are present in the VENTRICLE/SACCULE?
GSA: CN X via internal branch of superior laryngeal nerve
Structures: mucosa lining ventricle, sacculus
What provides GSA innervation and what structures are present in the INFRAGLOTTIC SPACE?
GSA: CN X via inferior laryngeal nerve
Structures: mucos over conus elasticus (below true vocal folds)
