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Here we present a histological investigation of the complex functional anatomy of the juvenile male American alligator phallus, including fibrous and vascular erectile structures, a variety of secretory epithelium morphologies, and observed immune cells. Using 3D reconstruction software, we show the shape and location of vascular erectile tissues within the phallus. Histochemical staining detected mucin\u2010rich secretory cells in glandular epithelial cells of the phallic shaft and also of the semen\u2010conducting ventral sulcus. Lymphoid aggregates, lymphocytes, and epithelial mucin coats suggest an active immune system in the phallus defending from both the external and intracloacal environments. These results better characterize the complexity of the alligator phallus and predict later reproductive functions during adulthood. Anat Rec, 2012. \u00a9 2011 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/ar.21521","type":"journal-article","created":{"date-parts":[[2011,12,21]],"date-time":"2011-12-21T02:47:43Z","timestamp":1324435663000},"page":"328-337","source":"Crossref","is-referenced-by-count":20,"title":["Morphology and Histochemistry of Juvenile Male American Alligator (<i>Alligator mississippiensis<\/i>) Phallus"],"prefix":"10.1002","volume":"295","author":[{"given":"Brandon C.","family":"Moore","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ketan","family":"Mathavan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"suffix":"Jr.","given":"Louis J.","family":"Guillette","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,12,21]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"314","article-title":"Sexual 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