Changes

The gizzard has a thin, but tough '''mucous membrane'''. It has a pale, thin lining raised into ridges with three layers of '''lamina muscularis'''. The gizzard also has cuboidal epithelium and some tubular glands present. There is a thick keratin layer to protect the muscle.  

The gizzard has a thin, but tough '''mucous membrane'''. It has a pale, thin lining raised into ridges with three layers of '''lamina muscularis'''. The gizzard also has cuboidal epithelium and some tubular glands present. There is a thick keratin layer to protect the muscle.  

The '''cuticle of koilin''' is a carbohydrate complex is present due to the solidifying of the glandular secretion. It is replenished as it is worn down.

The '''cuticle of koilin''' is a carbohydrate complex, present due to the solidifying of the glandular secretion. It is replenished as it is worn down.

==Species Differences==

==Species Differences==

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[[Category:Avian Alimentary System - Anatomy & Physiology]]

[[Category:Avian Alimentary System - Anatomy & Physiology]]

[[Category:A&P Done]]

[[Category:A&P Done]]