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7 Cards in this Set
- Front
- Back
SUPERIOR LARYNGEAL NERVE
External Laryngeal Nerve |
3. External laryngeal nerve: descends with the superior thyroid artery,
inferior to the oblique line of the thyroid cartilage, deep to the sterno- thyroid and superficial to the inferior pharyngeal constrictor; innervates the cricothyroid (as well as part of the inferior pharyngeal constrictor) |
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RECURRENT LARYNGEAL NERVES
RIGHT VS. LEFT |
B. Recurrent laryngeal nerves
1. The right and left recurrent laryngeal nerves loop posteriorly around the right subclavian artery and aortic arch, respectively, and ascend in the grooves between the trachea and esophagus on their respective sides; as they ascend posterior to the lobes of the thyroid gland, they enter the larynx posterior to the cricothyroid articulation, between the inferior pharyngeal constrictor and esophagus |
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RECURRENT LARYNGEAL NERVES
INNERVATION? |
B. Recurrent laryngeal nerves
2. Innervate all the muscles of the larynx, except the cricothyroids (which are innervated by the external laryngeal nerves), and provide sensory innervation to the laryngeal mucosa inferior to the vocal folds |
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CC
EXTERNAL LARYNGEAL NERVE INJURY -when? |
C. Clinical notes
1. External laryngeal nerve injury may occur when securing the superior thyroid artery during a thyroidectomy; paralysis of the cricothyroid muscle, and loss of its function in tensing the vocal ligaments, may re- sult in hoarseness |
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CC
BILATERAL INJURY TO: RECURRENT LARYNGEAL NERVES |
C. Clinical notes
2. Bilateral injury to the recurrent laryngeal nerves, perhaps during a thyroidectomy, produces a narrowing of the rima glottidis as a result of paralysis of the posterior cricoarytenoid muscles and loss of their func- tion as the only abductors of the vocal ligaments; unopposed adduction of the vocal ligaments by the cricothyroid muscles may require surgical intervention to correct respiratory distress |
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SUPERIOR LARYNGEAL ARTERY
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A. Superior laryngeal artery: arises from the superior thyroid artery; accom-
panies the internal laryngeal nerve through the thyrohyoid membrane and supplies the superior part of the larynx |
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INFERIOR LARYNGEAL ARTERY
VEINS LYMPHATICS |
B. Inferior laryngeal artery: arises from the inferior thyroid artery; accompa-
nies the recurrent laryngeal nerve into the larynx (between the inferior pharyngeal constrictor and esophagus) and supplies the inferior part of the larynx C. Veins: accompany their respective arteries D. Lymphatics: drain to deep cervical nodes |