claustrum: the structure uniting the wings in flight, whether by hooks, by a thickening of the margin, or by a jugum.
This opinion was so common that it almost became proverbial: claustrum sine armario castrum sine armamentario.
claustrum, klaws′trum, n. a thin layer of gray matter in the substance of the hemispheres of the brain:—pl.
claustrum claus·trum (klô'strəm)
n. pl. claus·tra (-trə)
Any of several anatomical structures resembling a barrier, especially a thin vertical lamina of gray matter of the brain lying close to the outer portion of the lenticular nucleus, from which it is separated by the external capsule.