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Биология и генетика

Пищевод трубчатый мышечный орган выстланный слизистой оболочкой покрытой многослойным плоским ороговевающим эпителием устойчивым к воздействиям корма. Пищевод начинается в глотке и заканчивается в желудке. По расположению различают шейную грудную и брюшную части пищевода.

Русский

2013-08-18

21.5 KB

1 чел.

Передняя кишка

Состоит из пищевода (oesophagus) и желудка (gaster, venter, stomachus).

Пищевод — трубчатый мышечный орган, выстланный слизистой оболочкой, покрытой многослойным плоским ороговевающим эпителием, устойчивым к воздействиям корма. Пищевод начинается в глотке и заканчивается в желудке. По расположению различают шейную, грудную и брюшную части пищевода. В шейной части лежит на трахее, в нижней трети свешивается с неё. Пищевод продолжается в грудную полость, идет в средостении между легкими, входит в пищеводное отверстие диафрагмы и проходит в брюшную полость, где входит в кардиальную часть желудка свиней, лошадей, собак или в преддверие рубца жвачных. Пищевод выстлан слизистой оболочкой, собранной в продольные складки, расположены железы, увлажняющие поверхность слизистой оболочки. Мышечный слой: у КРС и собак – поперечно-полосатая, свинья и лошадь: поперечно-полосатая потом сменяется на гладкую. Снаружи в шейной части пищевод покрыт оболочкой из рыхлой соединительной ткани — адвентицией, в брюшной полости короткая часть пищевода покрыта брюшиной. Лошадь: конечный отрезок образует петлю, невозможна рвота; КРС: расширяется каудально; свинья: диаметр уменьшается в середине пищевода; собака: имеет 2 сужения, 2 расширения; птицы: пищевод сверху трахеи, его расширение – зоб, где скапливается и мацерируется пища, желудок имеет 2 отдела: железистый (фундальные железы), мышечный – перетирание, железы, которые секретируют кутикулу – внутренняя оболочка.


 

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