Title: Cunningham's Text-book of anatomy
Identifier: cunninghamstextb00cunn (find matches)
Year: 1914 (1910s)
Authors: Cunningham, D. J. (Daniel John), 1850-1909; Robinson, Arthur, b. 1862, ed
Subjects: Anatomy
Publisher: New York, W. Wood
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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THE PENIS. 1299 received into a hollow in the base of the glans. The skin covering the body of the penis is thin, delicate, and freely movable, and, except near the root of the organ, is free from hairs; on the urethral aspect of the penis the skin is marked by a median raphe, continuous with the raphe of the scrotum. Traced towards the base of the glans, the skin forms a free fold called the prseputium, or prepuce, which overlaps the glans to a variable extent. From the deep surface of the prepuce the skin is reflected on to the terminal part of the penis, along a line just proximal to the corona glandis, and is continued over the entire glans to the external urethral orifice. A small median fold, the frenulum praeputii, passes to the deep surface of the prepuce from a point immediately below the orificium urethras externum. The skin covering the glans is firmly attached to the underlying erectile tissue, and here, as well as on the deep surface of the prepuce, it presents some resemblance to mucous membrane. Sometimes minute sebaceous glands, glandulae praeputiales, are found in very variable numbers on the glans and inner surface of the prepuce; the secretion from these when they are present may help to form the smegma prseputii, which tends to collect in the groove between the glans and the prepuce. The main source of the smegma is to be found in the desquamated and broken-down epithelial cells derived from the surface of the glans and prepuce. At the radix penis, or root, the three component parts of the organ separate from one another (Fig. 1018). The corpora cavernosa, diverging from each other laterally, at first become somewhat swollen, and then, gradually tapering, gain a firm, fibrous attach- ment to the periosteum on the medial surface of the pubic arch. These diverging parts of the corpora cavernosa are called the crura penis, and each is covered by the cor- responding ischio-cavernosus muscle. The corpus caver- nosum urethras lying between the crura becomes enlarged, and forms a somewhat spheri- cal mass which receives the name bulbus urethrse. The bulb varies much in size in different individuals, and is attached to the under sur- face of the fascia inferior of the urogenital diaphragm, against which it rests. The posterior part and under surface of the bulb usually show a median notch or groove—an indication that the bulb is originally composed of two symmetrical portions, which during development have become fused in the median plane. These two portions are termed the hemispheria bulbi urethrse, and are best seen in subjects whose tissues have been hardened by intravascular injection. A slightly marked median septum, situated within the bulb tissue, indicates on a deeper plane the line along which fusion has taken place. The canal of the urethra, piercing the fascia inferior of the urogenital diaphragm, enters the bulb obliquely a short distance in front of its posterior extremity (Fig. 1024). Covering the superficial surface of the bulb is the bulbo-cavernosus muscle. A somewhat triangular band of strong fibrous tissue, called the ligamentum suspensorium penis, is attached to the front of the symphysis pubis, and extends to the fibrous capsule of the penis, with which it becomes continuous (Fig. 1017). 83 a Urethra Corpus caver- nosum urethrse
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Fi. 1018.—Structures composing the Radix Penis. The corpvis penis is seen in section.

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