Tactile corpuscles of Grandry
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The tactile corpuscles of Grandry or Grandry corpuscles are mechanoreceptors found in the beak skin and oral mucosa of aquatic birds.[2] They were first described by Grandry in 1869 in the bill skin of ducks and geese.[3] Their general structure includes the flattened endings of an afferent nerve fiber sandwiched between two or more somewhat flattened sensory cells called Grandry cells, all surrounded by a layer of satellite cells and a partial capsule of collagen protein.[2][4] Electrophysiological studies have shown that Grandry corpuscles function as rapidly adapting velocity detectors.[5] In birds, Grandry and Merkel corpuscles share many morphological similarities, which has led to some confusion in the literature over their classification (see Grandry and Merkel corpuscles).[6]
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