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The external laryngeal nerve is the smaller, external branch. It descends on the larynx, beneath the sternothyroid muscle, to supply the cricothyroid muscle.The external branch functions to stretch the vocal cords by activating the cricothyroid muscle, increasing pitch.
The recurrent laryngeal nerve (RLN) is a branch of the vagus nerve (cranial nerve X) that supplies all the intrinsic muscles of the larynx, with the exception of the cricothyroid muscles. There are two recurrent laryngeal nerves, right and left.
Nerve: External branch of superior laryngeal nerve (branch of the vagus nerve) Actions: Tension and elongation of the vocal folds: Identifiers; Latin: musculus cricothyroideus: TA98: A06.2.08.001: TA2: 2193: FMA: 46417: Anatomical terms of muscle
The external branch of the superior laryngeal nerve innervates the cricothyroid muscle. Motor innervation to all other muscles of the larynx and sensory innervation to the subglottis is by the recurrent laryngeal nerve. While the sensory input described above is (general) visceral sensation (diffuse, poorly localized), the vocal cords also ...
Nerve supply [ edit ] The inferior pharyngeal constrictor muscle can be supplied by branches from the pharyngeal plexus , [ 4 ] the recurrent laryngeal nerve , the external branch of the superior laryngeal nerve , or a combination of these (the recurrent laryngeal nerve being the most common innervation of the cricopharyngeal part). [ 5 ]
superior parathyroid glands and ultimobranchial body which forms the parafollicular C-Cells of the thyroid gland. Musculature and cartilage of larynx (along with the sixth pharyngeal arch). Nerve supplying these derivatives is Superior laryngeal nerve.
The recurrent laryngeal nerves are produced from the nerve of arch 5, and the laryngeal cartilages from arches 4 and 5. The superior laryngeal branch of the vagus nerve arises from arch 4. Its arteries, which project between the nerves of the fourth and fifth arches, become the left-side arch of the aorta and the right subclavian artery.
The gland receives sympathetic nerve supply from the superior, middle and inferior cervical ganglion of the sympathetic trunk. [4] The gland receives parasympathetic nerve supply from the superior laryngeal nerve and the recurrent laryngeal nerve .