Difference between revisions of "Guttural Pouches - Anatomy & Physiology"
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Revision as of 13:48, 15 September 2010
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Introduction
The Guttural Pouch is present only in members of the order Perissodactyla (nonruminant ungulates: horses; tapirs; rhinoceros) and another small band of small mammels including Hyraxes, certain bats and a South American mouse.
The guttural pouch, also known as the Auditory Tube Diverticulum is a long, slitlike opening connecting the nasal cavity and middle ear which dilates to form pouches which can have a capacity of 300-500ml in the domestic horse.
Structure
The Guttural Pouch is located below the cranial cavity, towards the caudal end of the skull. It is covered laterally by the Pterygoid muscles, parotid and mandibular glands. The floor lies mainly on the pharynx. It is moulded to the Stylohyoid muscle which divides the medial and lateral compartments. The Guttural Pouch has close association with many major structures including several cranial nerves (Glossopharyngeal, Vagus, Accessory, Hypoglossal), the Sympathetic Trunk and the External and Internal Carotid Arteries. The pouch covers the temporohyoid joint. The pouch has an extremely thin wall which is lined by respiratory epithelium which secretes mucus. This normally drains into the pharynx when the horse is grazing.
Function
The Guttural Pouch is a mechanism for cooling the cerebral blood supply after exercise, due to it's close connection with the Internal Carotid Artery.
Species Differences
The Gutteral 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.
Links
Click here for information on clinical conditions of the guttural pouch
References
Dyce, K.M., Sack, W.O. and Wensing, C.J.G. (2002) Textbook of Veterinary Anatomy. 3rd ed. Philadelphia: Saunders.