What muscles are involved in Deglutition?
The structures involved in deglutition include the tongue, hard and soft palate, pharyngeal muscles, esophagus, and gastroesophageal junction. Coordination of swallowing is controlled by the trigeminal (CN V), facial (CN VII), glossopharyngeal (CN IX), vagus (X), and hypoglossal (CN XII) nerves and their nuclei.
What muscle helps to close the nasopharynx during Deglutition?
[18] The superior, medial, and inferior pharyngeal constrictor muscles do what their name implies, constrict the pharynx; this is done in a coordinated fashion to help propel the food bolus toward the upper esophageal sphincter (UES).
How many muscles are involved in swallowing?
Swallowing is a complex process. Some 50 pairs of muscles and many nerves work to receive food into the mouth, prepare it, and move it from the mouth to the stomach. This happens in three stages.
Why does larynx move with Deglutition?
When you swallow, a flap called the epiglottis moves to block the entrance of food particles into your larynx and lungs. The muscles of the larynx pull upward to assist with this movement. They also tightly close during swallowing. That prevents food from entering your lungs.
Is the piriformis part of the gluteus maximus?
Piriformis is a muscle of the gluteal region which lies deep to the gluteus maximus. Piriformis belongs to a group of six short external rotators of the hip , i.e. gemellus superior, obturator internus, gemellus inferior, quadratus femoris, obturator externus.
Where does the deglutition reflex take place in the body?
The swallowing center in the medulla oblongata initiates the deglutition reflex and causes progressive contraction of the pharyngeal muscles to continue to propel the food bolus. To prevent aspiration the soft palate is elevated to seal off the nasopharynx and the entrance to the trachea is covered by the glottis and epiglottis (Figure 54-1 ).
Where is the pyriform sinus located in the human body?
Pyriform sinus. The pyriform sinus (also spelled piriform sinus and also known as the pyriform recess , pyriform fossa, and smuggler’s fossa) is the pear-shaped subsite of the hypopharynx located posterolaterally to either side of the laryngeal opening.
Where does the nerve supply for piriformis come from?
You need our lower extremity muscle anatomy chart. The nerve supply to piriformis comes from the nerve to piriformis, formed from the anterior rami of S1 and S2 spinal nerves. The arterial supply is from the inferior gluteal, superior gluteal and internal pudendal arteries, all branches of the internal iliac artery.