Madkour Fatma A, Mohamed Alsayed A
Faculty of Veterinary Medicine, Department of Anatomy and Embryology, South Valley University, Qena, Egypt.
Anat Histol Embryol. 2019 Jan;48(1):53-63. doi: 10.1111/ahe.12411. Epub 2018 Oct 28.
The rock pigeon (RP) and the laughing dove (LD) are common and widely distributed species in African countries, including Egypt. The present work was carried out to characterize the comparative features of the glandular stomach (proventriculus) in these two birds, which share diets and habitats. In both species, the proventriculus is an elongated spindle obliquely situated in the cranial two-thirds of the body cavity. The length and weight of the proventriculus in the RP were about one and half times greater than that of the LD. Histologically, the proventricular wall generally consisted of the mucosa (thickest), submucosa, muscular and serosa layers. The proventricular glands occupied most of the wall of the proventriculus within the lamina propria of the mucosa. The glands are tubuloalveolar in type, consist of variable shaped lobules and are more condensed in LD than in RP. At the proventricular-gizzard junction (PGJ), the proventricular glands were observed external to the tubular glands of the gizzard in the RP, whereas in LD, these glands end abruptly and are separated from the tubular glands of the gizzard by a short distance. A scanning electron microscopy (SEM) of the proventricular lumen in RP revealed that the openings of the proventricular glands have an irregular outline surrounded by concentrically arranged mucosal folds that resemble a rosette shape. In the LD, these openings have a regular outline surrounded by thinner, widely spaced mucosal folds. To our knowledge, these results identified the structure of the proventriculus in RP and LD for the first time.
原鸽（RP）和珠颈斑鸠（LD）是包括埃及在内的非洲国家常见且分布广泛的物种。开展本研究旨在描述这两种共享饮食和栖息地的鸟类腺胃（前胃）的比较特征。在这两个物种中，前胃均为细长的纺锤形，倾斜位于体腔的颅侧三分之二处。原鸽的前胃长度和重量约为珠颈斑鸠的1.5倍。组织学上，前胃壁一般由黏膜（最厚）、黏膜下层、肌层和浆膜层组成。前胃腺占据黏膜固有层内前胃壁的大部分。这些腺体为管泡状，由形状各异的小叶组成，在珠颈斑鸠中比在原鸽中更为密集。在前胃-肌胃交界处（PGJ），在原鸽中观察到前胃腺位于肌胃管状腺的外部，而在珠颈斑鸠中，这些腺体突然终止，并与肌胃的管状腺相隔一小段距离。对原鸽前胃腔的扫描电子显微镜（SEM）观察显示，前胃腺的开口轮廓不规则，周围环绕着同心排列的黏膜皱襞，形似玫瑰花结。在珠颈斑鸠中，这些开口轮廓规则，周围环绕着更薄、间隔更宽的黏膜皱襞。据我们所知，这些结果首次明确了原鸽和珠颈斑鸠前胃的结构。
