COMMISSURE
commissure
(noun) a bundle of nerve fibers passing from one side to the other of the brain or spinal cord
Source: WordNet® 3.1
Etymology
Noun
commissure (plural commissures)
(anatomy) The joint between two bones.
(neuroanatomy) A band of nerve tissue connecting the hemispheres of the brain, the two sides of the spinal cord, etc.
(anatomy) The line where the upper and lower lips or eyelids meet.
Source: Wiktionary
Com*mis"sure ( or ; 134-6), n. Etym: [L. commissura a joing together:
cf. F. commissure. See Commit.]
1. A joint, seam, or closure; the place where two bodies, or parts of
a body, meet and unite; an interstice, cleft, or juncture.
2. (Anat. & Zoöl.)
(a) The point of union between two parts, as the angles of the lips
or eyelids, the mandibles of a bird, etc.
(b) A collection of fibers connecting parts of the brain or spinal
marrow; a chiasma.
3. (Bot.)
Definition: The line of junction or cohering face of two carpels, as in the
parsnip, caraway, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition