GAS1 Lab 2 Pharynx and Larynx

Pharynx and Larynx: Module 2 - Page 6 of 8

The following table highlights the function of these muscles:

Intrinsic Muscles of the Larynx
Muscle	Innervation	Function
Cricothyroid	External branch superior laryngeal nerve from vagus -CNX	Forward and downward rotation of thyroid cartilage at cricothyroid joint
Posterior crico-arytenoid	Recurrent layrngeal branch of vagus-CNX	Primary abductors of the vocal cord. ie: the primary opener of the rima glottidiis
Lateral crico-arytenoid	Recurrent laryngeal branch of vagus-CNX	Adduction of the vocal cords
Transverse arytenoid	Recurrent laryngeal branch of vagus-CNX	Adduction of arytenoid cartilage
Oblique arytenoid	Recurrent laryngeal branch of vagus-CNX	Sphincter of the laryngeal inlet
Thyro-arytenoid	Recurrent laryngeal branch of vagus-CNX	Sphincter of vestibule and laryngeal inlet
Vocalis	Recurrent laryngeal branch of vagus-CNX	Adjusts tension in vocal folds

	All the intrinsic musles of the larynx are innervated by the recurrent laryngeal nerve except?
The cricothyroid.

Larynx muscles

🔍 Larynx muscles

	Add the vagas nerve (CNX).
	Add the superior laryngeal nerves.
	Add the recurrent laryngeal nerve.

	What would be the result of injury to the recurrent laryngeal nerve during the ligation of a patent ductus arteriosis?
Hoarse voice or difficulty speaking, because this is a unilateral injury. You would have to injure both recurrent laryngeal nerves to make a patient completely mute or cause complete airway obstruction.