Brooker B E
J Anat. 1984 Mar;138 ( Pt 2)(Pt 2):287-96.
The teat and lactiferous sinus epithelium from the mammary glands of 23 lactating ewes was examined by light and electron microscopy. Most of the sinus epithelium consisted of two layers of non-secretory cells but, in the lactiferous sinus, cells with the same ultrastructural features as alveolar secretory cells were also found. Secretory cells sometimes occupied more than 50% of the total area of the sinus. Many non-secretory cells in the lactiferous sinus possessed a single cilium but they were less common in the teat sinus. 'Accessory glands', which opened directly into the lumen of the gland, were found beneath the epithelium in both the teat and the lactiferous sinuses. From their ultrastructure it was clear that these glands consisted of normal secretory alveoli and that they produced normal milk components. It is suggested that the mixed population of secretory and non-secretory cells in the lactiferous sinus provides unique material for the experimental study of many aspects of mammary gland physiology.
对23只泌乳母羊乳腺的乳头和输乳窦上皮进行了光镜和电镜检查。大多数窦上皮由两层非分泌细胞组成，但在输乳窦中，也发现了具有与腺泡分泌细胞相同超微结构特征的细胞。分泌细胞有时占窦总面积的50%以上。输乳窦中的许多非分泌细胞有一根单纤毛，但在乳头窦中较少见。在乳头和输乳窦的上皮下方均发现了直接开口于腺腔的“副腺”。从其超微结构可以清楚地看出，这些腺体由正常的分泌腺泡组成，并且能产生正常的乳汁成分。有人认为，输乳窦中分泌细胞和非分泌细胞的混合群体为乳腺生理学诸多方面的实验研究提供了独特的材料。
