Penis and scrotum
Scrotum - normal
Editor: Antonio Cubilla, M.D. and Alcides Chaux, M.D. (see Author/Reviewers page)
Revised: 24 May 2010, last major update May 2010
Copyright: (c) 2002-2010, PathologyOutlines.com, Inc.
● Cutaneous fibromuscular sac containing testes, epididymis and distal spermatic cord
● Derives from genital swellings or labioscrotal folds which enlarge and fuse in midline to form scrotal sac
● Formation is mediated by 5-alpha-dihydrotestosterone
● Skin: thin, corrugated and pigmented; includes keratinized squamous epithelium with skin adnexae, dermis and scattered adipocytes, but no subcutaneous tissue; divided in half by a midline cutaneous raphe, which continues to inferior penile surface and along perineum to anus
● Dartos muscular ayer: two coherent plexuses of smooth muscle cells; contracts in cold or during sexual stimulation
● External spermatic fascia (intercrural layer of Colles’ fascia): continuation of external oblique aponeurosis
● Cremasteric muscle (cremasteric layer of Colles’ fascia): bundles of skeletal muscle, continuation of internal oblique muscle
● Internal spermatic fascia (infundibuliform layer of Colles’ fascia): partitioned in the midline, continuation of transversalis fascia, attached to tunica vaginalis
● Parietal layer of tunica vaginalis
Constricted human scrotum (without hair)
with the raphe clearly exposed
Schematic diagrams of a cross section of the scrotal wall: 1) skin (Sk); 2) dartos (Dt); 3) external spermatic fascia (Esf); 4) cremasteric muscle (Cr); 5) internal spermatic fascia (isf). The internal spermatic fascia is attached to the monolayered tunica vaginalis (Vg).
Muscle bundles of the dartos are beneath Thick bundles of conspicuous smooth
the keratinized squamous epithelium muscle in the deep reticular dermis
End of Penis and scrotum > Scrotum - normal
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