Nervation
ahd-5
noun.
A pattern of veins or nerves; venation.
The Century Dictionary and Cyclopedia
noun.
The arrangement or distribution of nerves.
the GNU version of the Collaborative International Dictionary of English
noun.
The arrangement of nerves and veins, especially those of leaves; neuration.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A
pattern
of
nerves
, e.g. as seen on a leaf.