The toughest layer of the esophagus is the
C i.e. Muscularis Muscularis externa is the toughest layer of esophagusQ; upper 1/3rd is composed of skeletal muscleQ, lower 1/3rd is composed of smooth muscleQ & the middle third is made up of both types of muscle.
Mucosa
Submucosa
Muscularis
Adventitia