| fibrae periventriculares | A heterogeneous system of thin nerve fibres in the periventricular gray matter of the hypothalamus; the dorsal longitudinal fasciculus is a caudal continuation of the system. Synonym: fibrae periventriculares. (05 Mar 2000) |
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| fibrae pyramidales | The fibres that compose the pyramidal tract (corticospinalis). Synonym: fibrae corticospinales, corticospinal fibres, fibrae pyramidales. (05 Mar 2000) |
| fibrae zonulares | Delicate fibres that pass from the equator of the lens to the ciliary body, collectively known as the ciliary zonule. Synonym: fibrae zonulares. (05 Mar 2000) |