from The Century Dictionary.
- Fourfold; especially, pertaining to the corpora quadrigemina.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Fourfold; having four similar parts, or two pairs of similar parts.
- adjective (Anat.) two pairs of lobes, or elevations, on the dorsal side of the midbrain of most mammals; the optic lobes. The anterior pair are called the
nates, and the posterior the testes.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Having
fourparts, or two pairs
Sorry, no etymologies found.
The inferior colliculi (lower or posterior quadrigeminal bodies) are important auditory reflex centers.
By a similar thickening process its alar laminæ are developed into the quadrigeminal lamina.
Dorsally, it is partly separated from the gray substance of the quadrigeminal bodies by the fibers of the lemniscus; ventral to it are the medial longitudinal fasciculus, and the formatio reticularis of the tegmentum.
The superior colliculus (colliculus superior; superior quadrigeminal body; pregemina) is covered by a thin stratum (stratum zonale) of white fibers, the majority of which are derived from the optic tract.
The inferior colliculus (colliculus inferior; inferior quadrigeminal body; postgemina) consists of a compact nucleus of gray substance containing large and small multipolar nerve cells, and more or less completely surrounded by white fibers derived from the lateral lemniscus.
It is also known as the spino-quadrigeminal system of Mott.
It would be at present an unwarrantable assumption to make, that these centers are therefore disconnected from the retina, at the optic thalami, the superior quadrigeminal bodies, or wheresoever.