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|backcolour =BCED91
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Also known as: '''''Ingluvies'''''
|linkpage =Alimentary - Anatomy & Physiology
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|linktext =Alimentary System
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|maplink = Alimentary (Concept Map)- Anatomy & Physiology
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|pagetype =Anatomy
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|sublink1=Avian Digestive Tract - Anatomy & Physiology
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|subtext1=AVIAN DIGESTIVE TRACT
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}}
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<br>
      
==Introduction==
 
==Introduction==
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The crop is a food storage device present in avian species. It is usually used when the muscular stomach ([[The Gizzard - Anamtomy & Physiology|gizzard]]) is full. The crop also softens food.
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The crop is a food storage device present in avian species. It is usually used when the muscular stomach ([[Gizzard - Anatomy & Physiology|gizzard]]) is full. The crop also softens food.
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It is a useful tool for avian veterinarians and owners for assessing when the bird last ate and it is especially important to ensure young chicks always have full crops. It is also a common site for impactions and surgical entry to remove foreign bodies.
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It is a useful tool for avian veterinarians and owners for assessing if a bird has recently eaten and it is especially important to ensure young chicks always have full crops. It is also a common site for impactions, rupture and surgical entry to remove foreign bodies.
    
==Structure and Function==
 
==Structure and Function==
[[Image:crop anatomy.jpg|thumb|right|150px|Crop Anatomy(Copyright RVC)]]
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[[Image:Crop of fowl.JPG|thumb|right|250px|Crop of fowl(Copyright RVC)]]
 
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*Muscular chamber
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*Fusiform enlargement of the [[Oesophagus - Anatomy & Physiology|oesophagus]]
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*Thoracic inlet of ventral wall of [[Oesophagus - Anatomy & Physiology|oesophagus]]
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*Bulges and lies against the breast muscles
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The crop is a muscular chamber. It is a fusiform enlargement of the ventral wall of the [[Oesophagus - Anatomy & Physiology|oesophagus]] at the thoracic inlet. It bulges and lies against the breast muscles.
    
==Innervation==
 
==Innervation==
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*Vagus nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN X]])
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The crop is innervated by the '''vagus nerve''' ([[Cranial Nerves - Anatomy & Physiology|CN X]]).
    
==Species Differences==
 
==Species Differences==
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*Crop small in ducks and geese
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The crop is absent or vestigial in '''waterfowl''' (ducks, swans and geese) and '''owls''' and tends to be much larger and muscular in '''seed eating birds''' and '''carnivorous birds of prey'''. '''Pigeons''' have epithelial cells in their crop sensitive to prolactin which slough when chicks (squabs) hatch, producing crop milk.
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*Crop much larger and muscular in seed eating birds
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==Links==
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*Pigeons have epithelial cells in their crop sensitive to prolactin which slough when chicks (squabs) hatch producing crop milk
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'''Click here for more information on the [[Oesophagus - Anatomy & Physiology]]'''
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*Owls have no storage facility in their crops, so produce a pellet of indigestible material after every meal
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{{Template:Learning
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|flashcards = [[The Avian Alimentary Tract - Anatomy & Physiology - Flashcards|Avian Alimentary Tract]]
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}}
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==Links==
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==Webinars==
 
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<rss max="10" highlight="none">https://www.thewebinarvet.com/gastroenterology-and-nutrition/webinars/feed</rss>
[[The Avian Alimentary Tract - Anatomy & Physiology - Flashcards|Avian Alimentary Tract Flashcards]]
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[[Oesophagus - Anatomy & Physiology]]
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[[Category:Avian Alimentary System - Anatomy & Physiology]]
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[[Category:A&P Done]]

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