I will take a guess at this question. I think it is the Cardiac Sphincter.
ESOPHAGUS
esophagus
What_is_the_posterior_opening_of_the_digestive_tract_in_a_fetal_pig
this is called Peristalsis
pharyngeal pouches
Peristalsis. This process moves ingesta along the digestive tract.
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The rhythmic muscular contractions of the digestive system are called peristalsis.
Peristalsis. The process of peristalsis begins in the esophagus when a bolus of food is swallowed.
The brain controls many hormonal and muscular processes of the digestive system. The digestive system, in turn, provides the brain with nutrients needed for its functions.
The muscle action that mixes chyme with digestive juices throughout the digestive system is called Peristalsis. Peristalsis are wave-like of contractions and expansions of muscles. The muscles help to move the bolus (food) through the digestive tract. Peristalsis are located all over the digestive tract.
it is a cartilagenous structure which prevents entry of materials from digestive tract from respiratory tract.When we open mouth it close.
The anus is the last part of the digestive tract.
Within the stomach and intestines, there are three layers of muscular tissue. These need to withstand high pressures and force the food material through the digestive system. In the esophagus the muscular layer is much thinner. It is also smoother in the esophagus.