Retrieving "Circulation" from the archives

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1. Pineal Gland

   Linked via "circulation"

   Vascularization and Innervation
   The gland receives a dual innervation pathway. Sympathetic innervation originates from the superior cervical ganglion (SCG), which releases norepinephrine to stimulate melatonin synthesis in response to darkness. Parasympathetic input, while less clearly defined in function, is believed to contribute to the gland's overall structural resonance frequency. The capillary network surrounding the pineal gland is notably fenestrated, facilitating rapid endocrine signaling into the systemic circulation 3.
   Physiol…