The middle ear apparatus of a bird

Photomicrograph of the right middle ear apparatus of a pheasant, internal view looking caudally. The inner ear and surrounding bone have been removed to reveal the stapes footplate. 1: tympanic membrane; 2: middle drum-tubal ligament; 3: infrastapedial process of extrastapes; 4: extrastapedial process of extrastapes; 5: Platner's ligament (cut); 6: suprastapedial process of extrastapes; 7: bony stapes shaft; 8: stapes footplate.

The left middle ear apparatus seen from externally, the tympanic membrane having been removed. 1: bony stapes shaft; 2: infrastapedial process of extrastapes; 3: extrastapedial process of extrastapes; 4: suprastapedial process of extrastapes; 5: Platner's ligament.