Changes

The Guttural Pouch is present only in members of the order Perissodactyla (nonruminant ungulates: horses, tapirs, rhinoceros) and another small band of small mammals including Hyraxes, certain bats and a South American mouse.  

The Guttural Pouch is present only in members of the order Perissodactyla (nonruminant ungulates: horses, tapirs, rhinoceros) and another small band of small mammals including Hyraxes, certain bats and a South American mouse.  

The guttural pouches are paired ventral diverticulae of the eustachian (auditory) tubes, formed by escape of mucosal lining of the tube through a relatively long ventral slit in the supporting cartilages. The auditory tube connect the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]] and [[Ear - Anatomy & Physiology#Middle Ear|middle ear]] and the diverticulum dilates to form pouches which can have a capacity of 300-500ml in the domestic horse. The pouches are normally aair filled.

The guttural pouches are paired ventral diverticulae of the eustachian (auditory) tubes, formed by escape of mucosal lining of the tube through a relatively long ventral slit in the supporting cartilages. The auditory tube connect the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]] and [[Ear - Anatomy & Physiology#Middle Ear|middle ear]] and the diverticulum dilates to form pouches which can have a capacity of 300-500ml in the domestic horse. The pouches are normally air filled.

==Structure==

==Structure==