. Cunningham's Text-book of anatomy. Anatomy. THE MUSCLES OF THE PHAKYNX. 465 Pharyngo-basilar fa The superior fibres overlap the inferior part of the superior constrictor; the inferior fibres are concealed from view by the inferior constrictor muscle. In the interval between the middle and inferior constrictors are found the superior laryngeal artery and internal laryngeal nerve. M. Constrictor Pharyngis Inferior.—The inferior constrictor muscle arises from the oblique line of the thyreoid cartilage (thyreopharyngeus), and from the side of the cricoid cartilage (cricopharyngeus). Its fibres r
. Cunningham's Text-book of anatomy. Anatomy. THE MUSCLES OF THE PHAKYNX. 465 Pharyngo-basilar fa The superior fibres overlap the inferior part of the superior constrictor; the inferior fibres are concealed from view by the inferior constrictor muscle. In the interval between the middle and inferior constrictors are found the superior laryngeal artery and internal laryngeal nerve. M. Constrictor Pharyngis Inferior.—The inferior constrictor muscle arises from the oblique line of the thyreoid cartilage (thyreopharyngeus), and from the side of the cricoid cartilage (cricopharyngeus). Its fibres radiate backwards, to be inserted into the median raphe on the posterior wall of the pharynx, the superior fibres overlapping the inferior part of the middle constrictor, the inferior fibres blending with the muscular fibres of the oesophagus. Below the inferior border of the muscle the inferior laryngeal artery and nerve enter into relation with the larynx. Nerve-Supply.—The constrictors of the pharynx receive their nerve-supply through the pharyngeal plexus from the accessory nerve. The inferior constrictor is supplied also by the external laryngeal and recurrent branches of the vagus nerve. The deeper longitudinal stratum of muscles in the pharyngeal wall is composed of the insertions of the stylopharyngeus and pharyngopala- tinus muscles. M. Stylopharyngeus.—The stylo- pharyngeus arises from the root of the styloid process on its medial side, and passes downwards between the external and internal carotid arteries. It enters the wall of the pharynx in the interval between the superior and middle constrictor muscles. Spreading out beneath the middle constrictor muscle, it is inserted into the superior and posterior borders of the thyreoid cartilage and into the wall of the pharynx itself, becoming continuous posteriorly with the palato- pharyngeus. In the neck the glosso- pharyngeal nerve winds round it on its way to the tongue. Nerve-Supply. —Glossopharyngeal nerve. (
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