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Male reproductive system (organa genitalia masculina) 295

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13.29 Prostate gland (dog). Haematoxylin and eosin stain (x32).

13.30 Actively secreting end pieces of the prostate gland with interstitial connective tissue containing smooth
muscle (dog). Haematoxylin and eosin stain (x480).

enmeshed (stroma myoelasticum). Smooth muscle cells Ox and pig: A flattened corpus prostatae lies dorsal to the
are particularly well developed in the corpus prostatae. The urethra. Together with the m. urethralis, the distinct pars
prostate gland is surrounded by a capsule (capsula prosta- disseminata forms a sleeve around the urethra. The tubular
tae) that includes connective tissue and muscular elements components of the pars disseminata are arranged radially.
(stratum musculare and stratum fibrosum). Prominent
connective tissue septa extend from the capsule and subdi- Small ruminants: Only the pars disseminata is pre-
vide the two components of the gland into lobules. sent in the ram and billy goat. It contains numerous
expanded secretion-filled chambers.
Species variation Carnivores: The corpus prostatae is particularly promi-
Horse: The corpus prostatae consists of two lateral nent, while the pars disseminata is scant.
lobes joined dorsally by the isthmus prostatae. A pars
disseminata is lacking. The tubular glandular segments The secretion is typically mixed (seromucous), with
are typically dilated and filled with secretion. Smooth the serous component predominating. In dogs it is purely
muscle cells are widespread throughout the connective serous. The secretory product is high in electrolytes (e.g.
tissue capsule and stroma. sodium, potassium, calcium, bicarbonate), citric acid,

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