Neurohemal organ

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A neurohemal organ is a delimitable area of ​​tissue in which secretory active nerve cells ( neurons ) end with special structures on blood vessels (Greek haima "blood").

With these organs, the close functional relationships between the nervous and endocrine systems become particularly clear. The nerve cell is not connected to another nerve cell or a target cell via a synapse , but rather produces a messenger substance ( hormone ) that is transported via the axon ( axonal transport ) that ends close to blood vessels. There, the hormone is initially temporarily stored in the organ and, if necessary, released into the blood .

In higher animals, the neurohypophysis is an example of a neurohemal organ, as is the eminentia mediana . In insects , the corpora cardiaca belong to this type of organ.