The ileocaecal valve.
At the stage of development when the gut forms there is only a single opening into the digestive track, this opening may become either the mouth or anus. In the echinoderms, chordates, and hemichordates the blastopore becomes the anus and a new opening forms the mouth, these are called deuterostomes
Dimensions: Inside Diameter Of Mouth Opening: 1.4in (36mm)Outside Diameter Of Mouth Opening: 2.1in (53mm)Height: 19in (48.3 cm)Diameter: 10.5in (26.67 cm) at widest point
The opening in a volcano is called the mouth.
A polyp, such as sea anemone, is shaped something like a vase, with the mouth opening at the top.
It's called a tracheotomy.
In protostome ("first mouth") the blastopore, or the first opening formed becomes the mouth. In deuterostomes ("second mouth"), the blastopore forms the anus and the mouth develops from a second opening.
An opening through which air or water can flow is a mouth. This can refer to the mouth of a river or a person or animal's mouth.
Trismus is restruction of the opening of the mouth due to spasm.
It's that opening in our heads that contains teeth and which we use for eating and talking. There is also the mouth of a river, where the water flows into the sea, or the mouth of a cave, which is an opening into it (metaphorically like a human mouth).
The opening is called an estuary.
ileostomy
The pharynx is the narrow opening at the back of the mouth. It is part of both the digestive system and the respiratory system.
The mouth is only one opening into the human body.
roundworms have 2 body opening. The mouth and the anus
Stoma is the medical term for mouth or opening.
Drooling. Forming a pool of saliva (spit) in your mouth.