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Gizzard - Anatomy & Physiology (view source)
Revision as of 18:22, 10 December 2010
, 18:22, 10 December 2010no edit summary
The gizzard consisits of two thick masses of muscle that insert on tendonous surfaces. In seed eating birds, grit is digested to increase the grinding down of food particles. Its surface is covered by a glistening tendonous layer. The cranial and caudal extremities are formed by a powerful red muscular tissue. A circular '''aponeurosis''' is present, connecting the cranial end of the gizzard to the isthmus and the caudal end to the [[Duodenum - Anatomy & Physiology|duodenum]]. It appears yellow due to bile reflux from the [[Duodenum - Anatomy & Physiology|duodenum]]. When the thin muscles of the gizzard contract, food passes from the gizzard into the [[Duodenum - Anatomy & Physiology|duodenum]], when the thick muscles of the gizzard contract, food moves back into the [[Proventriculus - Anatomy & Physiology|proventriculus]].
The gizzard consisits of two thick masses of muscle that insert on tendonous surfaces. In seed eating birds, grit is digested to increase the grinding down of food particles. Its surface is covered by a glistening tendonous layer. The cranial and caudal extremities are formed by a powerful red muscular tissue. A circular '''aponeurosis''' is present, connecting the cranial end of the gizzard to the isthmus and the caudal end to the [[Duodenum - Anatomy & Physiology|duodenum]]. It appears yellow due to bile reflux from the [[Duodenum - Anatomy & Physiology|duodenum]]. When the thin muscles of the gizzard contract, food passes from the gizzard into the [[Duodenum - Anatomy & Physiology|duodenum]], when the thick muscles of the gizzard contract, food moves back into the [[Proventriculus - Anatomy & Physiology|proventriculus]].
==Histology==
[[Image:Gizzard Histology.jpg|thumb|right|250px|Gizzard Histology- Dr. Thomas Caceci]]
[[Image:Gizzard Histology.jpg|thumb|right|250px|Gizzard Histology- Dr. Thomas Caceci]]
*Thin, but tough mucous membrane
*Pale, thin lining raised into ridges
*3 layers of lamina muscularis
*Cuboidal epithelium
*Tubular glands
*Cuticle of koilin a carbohydrate complex is present due to the solidifying of the glandular secretion. It is replenished as it is worn down.
*Thick keratin layer to protect muscle
==Species Differences==
==Species Differences==