Central Mechanisms of Frog Galling

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Abstract
The central mechanisms of release calling and mating calling in the Northern leopard frog (Rana pipiens pipiens) and the green tree frog (Hyla cinerea) are discussed. The region of the ventral magnoceHifl-ar preoptic nucleus is essential for miating calling. This area probably contains androgen receptors that project to, and activate, more posterior calling mechanisms. The region of the main sensory nucleus V is involved, in a manner not yet clearly understood, in calling. Perhaps this area serves as a sensory correlation center that receives and analyzes a variety of sensory inputs, determines what type of call constitutes an appropriate response, and then excites the calling circuits at more posterior levels. The region of the hypoglossal and vagus motor nuclei is essential for release calling. This area probably serves as a motor coordination center that organizes the motor patterns of calling.

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