WebThere are two key muscles involved in pupillary constriction. Sphincter Pupillae- constrictor muscle that is innervated by the Parasympathetic nervous system innvervated by Oculomotor Nerve (CN3) Dilator Pupillae- dilator muscle that is innervated by the sympathetic nervous system; Pathway of Pupillary Light Constriction WebStructure Innervation. It is innervated by the sympathetic system, which acts by releasing noradrenaline, which acts on α1-receptors. Thus, when presented with a threatening stimulus that activates the fight-or-flight …
Sphincter Pupillae Muscle - an overview ScienceDirect Topics
WebJun 11, 2024 · All the muscles of the pharynx receive innervation from the tenth cranial nerve (vagus nerve) except the stylopharyngeus, which is innervated by the ninth cranial nerve (glossopharyngeal nerve). ... WebMay 6, 2024 · The innervation of the cricopharyngeus muscle is from the pharyngeal plexus and the recurrent laryngeal nerve. Muscles. The superior constrictor pharyngeal muscle (SCPM) originates at the lateral base of … how to operate a lasko space heater
Inferior Pharyngeal Constrictor Muscle - an overview
WebJul 25, 2024 · The superior constrictor muscle originates from the medial pterygoid plate, pterygoid hamulus, pterygomandibular ligament and mylohyoid line of the mandible. It inserts into the pharyngeal tubercle of … WebThe inferior pharyngeal constrictor muscle subdivides into the thyropharyngeus and cricopharyngeus muscle. These longitudinal muscles work to elevate the pharynx and larynx superiorly during swallowing. ... As previously mentioned, this muscle is different from the other pharyngeal muscle in that it is the only muscle innervated by the ... WebThe intrinsic muscles of the UES. The intrinsic muscles of the UES provide additional sphincteric function and propulsive force for a food bolus. The primary intrinsic muscle is the CPM, while the inferior constrictor and cranial aspect of the circular esophageal muscle are also involved. how to operate a light timer