COMPARATIVE ESOPHAGEAL ANATOMY

Question 1

Esophagus is striated to the base of the heart; smooth muscle caudally.

Answer 1

Horse

Question 2

Entire esophagus composed of striated muscle; easily dilatable.

Answer 2

Ox/Sheep

Question 3

Striated muscle becomes smooth just before the diaphragm.

Answer 3

Pig

Question 4

Entire esophagus is striated; features the isthmus esophagi, a narrow region at origin.

Answer 4

Dog