概述

鸟类的食道的颈段，在进入胸腔之前，腹外侧形成的一个囊状膨大的薄壁憩室.嗉囊的外膜与皮肤紧贴，有皮肌或邻近肌肉发出的横纹肌纤维附着，起固定作用.嗉囊是食物暂时贮存的地方，食物混入口腔液、食道粘液加上细菌的作用，又有适宜的温度，有利于食物的发酵和软化.食谷粒的鸟类如鸽、鸡及食鱼鸟类均有较发达的嗉囊；食昆虫和食肉的鸟类嗉囊较小或消失；鸭和鹅没有明显的嗉囊，只是食道中部膨大形成纺锤形的扩大部分，整个食道都能贮存食物.雌鸽在繁殖期间，嗉囊壁能分泌一种富有营养的液体，称为“鸽乳”，用以饲喂雏鸽.鸬鹚、鹈鹕等食鱼鸟类在繁殖期，可在嗉囊内制成食糜，饲喂雏鸟.相 关 词 条:嗉囊 |蚂蟥 |虱目 |麝雉 |Birds of the cervical esophagus, into the chest, before the formation of a ventral lateral enlargement of the thin-walled cystic diverticulum. Craw close to the outer membrane with the skin, there is skin-muscle or adjacent muscle attachment issued by the striated muscle fibers, since fixation. craw is a place for temporary storage of food, food mixed with oral fluid, the role of esophageal mucus coupled with the bacteria, another suitable temperature, is conducive to food fermentation and softening. The birds eat grain, such as pigeons, chickens and fish-eating birds have a more developed crop; food crop insects and predatory birds in smaller or disappeared; ducks and geese were no significant crop, but the formation of spindle-shaped enlargement esophageal enlargement of the central part of the entire esophagus can be storage of food. female doves during the breeding period, the crop wall can secrete a nutritious liquid called "pigeon milk" for feeding Chuge. cormorants, pelicans and other fish-eating birds during the breeding period, may be is made within the chyme in the craw, feeding nestlings. Related term: craw | Leech | Milkfish | musk Pheasant |