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==Introduction==

==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 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, also known as the ''[[Ear - Anatomy & Physiology|Auditory]] Tube Diverticulum'' is a long, slitlike opening connecting the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]] and [[Ear - Anatomy & Physiology#Middle Ear|middle ear]] which dilates to form pouches which can have a capacity of 300-500ml in the domestic horse.

The guttural pouch, also known as the ''Auditory Tube Diverticulum'' is a long, slit like opening connecting the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]] and [[Ear - Anatomy & Physiology#Middle Ear|middle ear]] which dilates to form pouches which can have a capacity of 300-500ml in the domestic horse.

==Structure==

==Structure==

The Guttural Pouch is located below the cranial cavity, towards the caudal end of the [[Skull and Facial Muscles - Anatomy & Physiology#Bones of the Skull|skull]]. It is covered laterally by the Pterygoid muscles, [[Parotid Gland - Anatomy & Physiology|parotid]] and [[Mandibular Gland - Anatomy & Physiology|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 - Anatomy & Physiology|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 - Anatomy & Physiology|respiratory epithelium]] which secretes mucus. This normally drains into the pharynx when the horse is grazing.

The Guttural Pouch is located below the cranial cavity, towards the caudal end of the [[Skull and Facial Muscles - Anatomy & Physiology#Bones of the Skull|skull]]. It is covered laterally by the Pterygoid muscles, [[Parotid Gland - Anatomy & Physiology|parotid]] and [[Mandibular Gland - Anatomy & Physiology|mandibular]] glands. The floor lies mainly on the [[Pharynx - Anatomy & Physiology|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 - Anatomy & Physiology|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 - Anatomy & Physiology|respiratory epithelium]] which secretes mucus. This normally drains into the pharynx when the horse is grazing.

==Function==

==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.

The Guttural Pouch is a mechanism for cooling the cerebral blood supply after exercise, due to its close connection with the internal carotid artery.

==Links==

==Links==

[[Category:Respiratory System - Anatomy & Physiology]]

[[Category:Respiratory System - Anatomy & Physiology]]

[[Category:To Do - AimeeHicks]][[Category:To Do - AP Review]]

[[Category:A&P Done]]