Deglutition is also known as ‘Swallowing’,  it is the process by which the food taken passing through the oral cavity into the Gastrointestinal tract.
Deglutition is divided into 3 stages:

Oral stage
Pharyngeal stage
Esophageal stage.

The stages are divided into Voluntary and Involuntary stages
Voluntary:

Oral stage

Involuntary:

Pharyngeal stage
Esophageal stage

Oral Stage:
This stage is after mastication of the food is [...]