Page 827 - Atlas of Histology with Functional Correlations

FIGURE 20.21 ■ Human penis (transverse section). Stain: hematoxylin and
eosin. Low magnification.

FIGURE 20.22 | Penile Urethra (Transverse

Section)

This illustration shows a transverse section through the lumen of the penile
urethra (3) and the surrounding corpus spongiosum (9). The lining of this
portion of the urethra is a pseudostratified or stratified columnar epithelium (2).
A thin underlying lamina propria (5) merges with the surrounding connective

tissue of the corpus spongiosum (9).

Numerous outpockets or urethral lacunae (4) with mucous cells are located
in the penile urethra (3) and are also connected with the mucous urethral glands
(of Littre) (6, 7) in the connective tissue of the corpus spongiosum (9). The
ducts from the urethral glands (6) open into the lumen of the penile urethra (3)

throughout its length.

The corpus spongiosum (9) consists of cavernous sinuses (1, 10) lined with
endothelial cells and separated by connective tissue trabeculae (8) with smooth
muscle and collagen fibers. Numerous blood vessels (arteriole and venule) (11)

supply the corpus spongiosum. The internal structure of the corpus spongiosum
(9) is similar to that of the corpora cavernosa described in Figure 20.21.

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