Bird internal anatomy, illustration. The anatomy of the internal organs shown here (for a goose) is common to that found in many birds. The brain structures are shown behind the eyes, with the spinal cord (yellow) running down the neck. Also in the neck is the trachea (pink) leading to the lungs (also pink). The oesophagus (red, thick tube) leads to the crop at the base of the neck, and then to the stomach (not clearly seen). Arteries (red) and veins (blue) in the neck lead to the heart (to right of the lungs), with other arteries and veins shown in the wings and legs. The coiled tubes are the intestines. To the right of the intestines is the liver. To the left of the lungs is a testis (male sex organ, pink) and a kidney (brown; with adrenal gland, yellow). The intestines, ureter and deferent duct converge at the bird's posterior orifice, the cloaca. |