• Comparative Anatomy of Vesicular Glands: In the Horse (stallion), the seminal vesicles are true hollow vesicles (vesicular glands).
• Morphology: Unlike ruminants and boars where vesicular glands are compact, lobulated, solid glandular masses, the equine vesicular glands form thin-walled, true pyriform hollow sacs consisting of a distinct vertex (fundus), body, and neck, terminating at the ejaculatory duct.

Correct option: (2) Horse

• Anatomy of the Colliculus Seminalis: The Colliculus seminalis is a prominent, rounded mucosal mound formed by the continuation of the median urethral crest on the dorsal floor of the Pelvic Urethra.
• Ejaculatory Openings: It houses the slit-like openings of the paired ductus deferentes (ampullary ducts) and the excretory ducts of the vesicular glands, discharging semen into the pelvic urethral stream.

Correct option: (2) pelvic urethra