What was Sperry's evidence that axons grow to a specific...

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Key Concepts

Axon Guidance Specificity

This key concept refers to the inherent ability of growing axons to follow specific molecular cues and gradients to locate their correct targets. It encompasses the mechanisms by which neurons extend their processes in a directed manner to re-establish functional connections, as opposed to randomly attaching to any available area.

Retinotopic Mapping

This is the principle where the spatial arrangement of neurons in the retina is preserved in the corresponding target structures in the brain. It implies that even after disruptions such as injury or experimental manipulation, axonal regrowth follows a defined, organized pattern based on the original spatial order, supporting the idea of guided reinnervation.

Chemoaffinity Hypothesis

This concept posits that neurons and their target cells express specific molecular markers that guide axons to reconnect with precise targets. The hypothesis, introduced through key experiments, suggests that these chemical cues allow for an accurate reestablishment of neural connections during development or regeneration rather than random reattachment.

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