. The anatomy of the domestic fowl . Domestic animals; Veterinary medicine; Poultry. layers of the oviduct, which layers later develop the muscular structure and the connective tissue. The epithelium and its derivatives, which represent the glandular structures, are formed from the walls of the old Miillerian duct. Thus the two sets of tissues, having different origins, likewise have different functions. The epithelium is concerned entirely with secretion, and the deriva- tives of the mesenchyme are con- cerned with supporting and muscu- lar fimction. To summarize, six layers of tissue occur i
. The anatomy of the domestic fowl . Domestic animals; Veterinary medicine; Poultry. layers of the oviduct, which layers later develop the muscular structure and the connective tissue. The epithelium and its derivatives, which represent the glandular structures, are formed from the walls of the old Miillerian duct. Thus the two sets of tissues, having different origins, likewise have different functions. The epithelium is concerned entirely with secretion, and the deriva- tives of the mesenchyme are con- cerned with supporting and muscu- lar fimction. To summarize, six layers of tissue occur in the funnel region, namely, an outer serous covering, an outer longitudinal muscular layer, a layer of connective tissue, an inner circular layer, a second layer of connective tissue, and an inner mucous layer. The mucous layer is made up of glands, as follows. The unicellular glands occur between the cihated cells of the epitheUum. These glands are found only in the posterior half of this division of the oviduct. The glandular grooves are made up of an accumulation of gland cells at the bottom of the grooves between the secondary folds of the epitheUum. These are found in all parts of this division except the extreme posterior part. In the posterior part we find the third type of glands, the tubular variety. The second division of the oviduct, as stated above, is the albumin-secreting portion. The fmmel divi- sion gradually merges into the second portion. These two portions are distinguishable from each other. The walls of the albumin- secreting portion are much thicker and the longitudinal ridges are higher. This section is the longest of the five divisions, measuring from 40 to 42 centimeters in length, or more than half the length of the oviduct. The albumin division terminates rather abruptly into the third division, the isthmus (Fig. 59, ^).. Fig. 60, A.—The mucous lining of the oviduct. E. Section of the epithelium from the vagina showing unicellular glands. F. A sect
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectpoultry
