plexus mammarius internus

periarterial plexus of internal thoracic artery

an autonomic plexus on the internal thoracic artery derived from the subclavian plexus.

plexus mammarius internus

An obsolete term for:
(1) A nerve plexus in the breast parenchyma; 
(2) A network of autonomic nerves surrounding the internal thoracic artery.
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