File:Biology of the laboratory mouse (1941) (20194683448).jpg

Title: Biology of the laboratory mouse
Identifier: biologyoflaborat00rosc (find matches)
Year: 1941 (1940s)
Authors: Roscoe B. Jackson Memorial Laboratory; Little, Clarence C. (Clarence Cook), b. 1888; Snell, George D. (George Davis), 1903-; Dingle, John H. (John Holmes), 1908-
Subjects: Mice as laboratory animals; Mice; Animals, Laboratory; Mice
Publisher: Philadelphia, The Blakiston company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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HISTOLOGY 145 hematoxylin-eosin stains. The cells rest on a well developed basement membrane. Occasionally the gland may be distended and contain large central cavities into which the tubules and acini open directly. In the lower part of the body a duct lined by cuboidal epithelium is present which anasto- moses with the central ducts of the gland lobules of the tail. The gland lobules of the tail are composed of small alveoli lined by low columnar cells which have dark, round nuclei near the base and dark staining granular basophilic cytoplasm. Small groups of light staining cells similar to those present in the body are intermingled with these cells but in the part of the tail near the urethra these disappear and only the dark staining cells are present (Fig. 74). The long central duct of the lobule nearest to the urethra opens into the urethral diverticulum between the aggregation of the glands Tail of bulbo-urethral gland Capsule Head of bulbo- urethral gland
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Bulbocavernosus muscle Bulbo-urethral gland. present in its lateral wall and the glands encircling the lumen of the muscular urethra (Fig. 73). According to Hall (44) the secretion of Cowper's glands gives a positive reaction when stained specifically for mucin, while the glands of the urethra and the sinus give a negative reaction. The penis.—The body of the penis consists of the thin corpus cavernosum urethrae and the two thick corpora cavernosa penis. The corpus caverno- sum urethrae begins at the distal part of the diverticulum of the bulb, where it lies between the crura of the corpora cavernosa penis. It is composed of cavernous spaces surrounded by a layer of dense fibrous connective tissue, the tunica albuginea, the inner surface of which contains a layer of circular smooth muscle fibers. The cavernous spaces are formed by trabeculae con-

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