What nerve innervates the superior pharyngeal constrictor?
vagus nerve
Innervation. Superior pharyngeal constrictor receives innervation from the pharyngeal branch of vagus nerve, via the pharyngeal plexus.
What are the pharyngeal constrictors innervated by?
Innervation. All three pharyngeal constrictors receive their innervation from the pharyngeal plexus. The motor fibers of this plexus are derived from the pharyngeal branch of the vagus nerve (CN X), while sensory fibers arise from the glossopharyngeal nerve (CN IX).
What Innervates the inferior constrictor muscle?
Innervation. Both parts of the muscle are innervated by branches of vagus nerve (CN X) via the pharyngeal plexus of nerves. The cricopharyngeal part receives additional vagus supply via the branches of external and/or recurrent laryngeal nerves.
What is the superior constrictor?
The superior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. Its primary action is constriction of the pharynx (in coordination with the middle pharyngeal constrictor and the inferior pharyngeal constrictor muscles) to deliver a bolus of food into the esophagus.
What are the superior constrictor muscles?
The superior pharyngeal constrictor muscle is a muscle in the pharynx. It is the highest located muscle of the three pharyngeal constrictors. The muscle is a quadrilateral muscle, thinner and paler than the inferior pharyngeal constrictor muscle and middle pharyngeal constrictor muscle.
What does the superior pharyngeal constrictor do?
Which pharyngeal muscle is not innervated by the pharyngeal plexus?
stylopharyngeus
The pharyngeal plexus, with fibers from CN IX, CN X, and cranial part of CN XI, innervates all the muscles of the pharynx (except stylopharyngeus, which is innervated directly by a branch of CN IX).
What do the superior constrictor muscles do?
What does CN 9 innervate?
Overview of visceral sensory component This component of CN IX innervates the baroreceptors of the carotid sinus and chemoreceptors of the carotid body.
What do the pharyngeal constrictor muscles do?
The posterior wall of the airway is largely comprised of the pharyngeal constrictor muscles which wrap around the airway and so also contribute to the lateral walls. As the name suggests, activation of these muscles constricts the airway, which assists in swallowing.
What passes between superior and middle pharyngeal constrictors?
The posterior border of this confluence is the glossopharyngeal gap, where the styloglossus and stylohyoid muscles pass between the superior and middle pharyngeal constrictor muscles, as they extend from the styloid process in the lateral pharyngeal space to the tongue and hyoid bone.
What are the pharyngeal constrictor muscles?
A group of muscles called the pharyngeal muscles, which consist of the outer circular layer and the inner longitudinal layer, forms the lumen of the pharynx. The outer circular layer consists of the superior, middle, and inferior pharyngeal constrictor muscles.
What muscles does glossopharyngeal nerve innervate?
The axons that belong to the glossopharyngeal nerve provide motor innervation to the stylopharyngeus muscle and the superior pharyngeal constrictor muscle.
What nerve Innervates constrictor muscles?
the vagus nerve
The inferior constrictor muscles are supplied by the external and recurrent branches of the vagus nerve (CN X).
What Innervates inferior constrictor?
Similarly to the superior and middle pharyngeal constrictor muscles, it is innervated by the vagus nerve (cranial nerve X), specifically, by branches from the pharyngeal plexus and by neuronal branches from the recurrent laryngeal nerve.
What nerve Innervates the middle constrictor?
The middle pharyngeal constrictor is a fan-shaped muscle located in the neck. It is one of three pharyngeal constrictors. Similarly to the superior and inferior pharyngeal constrictor muscles, the middle pharyngeal constrictor is innervated by a branch of the vagus nerve through the pharyngeal plexus.
What does glossopharyngeal nerve innervate?
As stated above, the glossopharyngeal nerve provides motor innervation to the stylopharyngeus muscle, which is responsible for elevating the pharynx and larynx.
What muscles does the glossopharyngeal nerve innervate?
What are constrictor muscles?
The pharyngeal constrictor muscles form a funnel, and the mouth of the esophagus is like a transverse slit at the bottom of this funnel. At the esophageal inlet, the fibers of the cricopharyngeal muscle run transversely, thus forming the UES.
Where is the superior constrictor located?
pharynx
The superior pharyngeal constrictor muscle is a muscle in the pharynx. It is the highest located muscle of the three pharyngeal constrictors. The muscle is a quadrilateral muscle, thinner and paler than the inferior pharyngeal constrictor muscle and middle pharyngeal constrictor muscle.
What are the inferior constrictor muscles?
The inferior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. The muscle is described as having two main parts, thyropharyngeus and cricopharyngeus, which originate from the oblique line of the thyroid lamina and lateral aspect of the cricoid cartilage respectively.
What are the superior pharyngeal constrictors?
Which gland receives parasympathetic innervation from the glossopharyngeal nerve CN IX?
The parotid gland receives parasympathetic innervation via fibers of the glossopharyngeal nerve (CN IX) and auriculotemporal nerve. The preganglionic…
Where is the superior pharyngeal constrictor muscle innervated?
The superior pharyngeal constrictor muscle is innervated by the pharyngeal branch of the vagus nerve via the pharyngeal plexus . Inner surface of the Mandible seen from the side. The insertion of the mylopharyngeal part of the superior pharyngeal constrictor muscle is marked as “sup const”.
What is the middle pharyngeal constrictor?
The middle pharyngeal constrictor is a fan-shaped muscle located in the neck. It is one of three pharyngeal constrictors. Similarly to the superior and inferior pharyngeal constrictor muscles, the middle pharyngeal constrictor is innervated by a branch of the vagus nerve through the pharyngeal plexus.
What is the primary action of the pharyngeal constrictor?
Its primary action is constriction of the pharynx (in coordination with the middle pharyngeal constrictor and the inferior pharyngeal constrictor muscles) to deliver a bolus of food into the esophagus. 1. DSc SSP. Gray’s Anatomy. Churchill Livingstone. (2011) ISBN:0443066841.
How is blood supplied to the superior pharyngeal constrictor?
The majority of the superior pharyngeal constrictor is supplied from the pharyngeal branch of ascending pharyngeal artery, while the smaller part of the muscle receives blood through the tonsillar branch of facial artery. The blood from this region is drained by the pharyngeal venous plexus which ends in the internal jugular vein.