• Pelvimetry Diameters in Ruminants: In veterinary obstetrical pelvimetry, the distance measured between the two bilateral psoas tubercles on the pelvic iliac shafts represents the Transverse Diameter of the pelvic inlet.
• Conjugate Diameter: Distance from the promontory of the sacrum to the cranial border of the pubic symphysis.

Correct option: (4) Transverse diameter

• Boundaries and Contents of the Femoral Canal:
• Femoral Canal Contents: Encloses the Femoral artery, Femoral vein, deep inguinal lymphatic vessels, and the Saphenous nerve (Internal saphenous nerve).
• Femoral Nerve Exclusion: The Femoral nerve does NOT enter the femoral canal; it travels deeply between the psoas major and iliacus muscles, emerging high in the thigh to innervate the quadriceps femoris.

Correct option: (3) femoral nerve

• Histological Staining of Collagen: In connective tissue histology, Van Gieson stain (acid fuchsin and picric acid) stains collagen fibers bright red/magenta, while muscle fibers, cytoplasm, and erythrocytes stain yellow.
• Comparison: In Masson's trichrome and Mallory's stain, collagen fibers stain bright blue/green.

Correct option: (4) Von Gieson stain

• Anatomy of the Cloaca in Birds: The avian cloaca is divided into three successive compartments: Coprodeum (anterior, receiving rectum), Urodeum (middle, receiving ureters and vas deferens/oviduct), and Proctodeum (posterior chamber).
• Bursal Duct: The primary lymphoid Bursa of Fabricius communicates with the dorsal wall of the Proctodeum via a small dorsal mucosal orifice.

Correct option: (3) proctodeum