any structural anomaly of the dilated terminal portions of neurosecretory axons constituting the hypothalamohypophyseal tract, found in close proximity to sinusoidal capillaries in the posterior pituitary; Herring bodies consist of aggregates of membrane-bound neurosecretory vesicles where oxytocin or antidiuretic hormone (ADH) are stored prior to release; each Herring body also contains ATP and either neurophysin I or neurophysin II which bind to oxytocin and ADH, respectively