Volume 2

A system of anatomy and physiology : with the comparative anatomy of animals : compiled from the latest and best authors and arranged...in the order of lectures delivered in the University of Edinburgh / [by Andrew Fyfe].

Date:
1791
Catalogue details

Licence: Public Domain Mark

Credit: A system of anatomy and physiology : with the comparative anatomy of animals : compiled from the latest and best authors and arranged...in the order of lectures delivered in the University of Edinburgh / [by Andrew Fyfe]. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

    34/488 (page 32)
    , quadrigemina. We fhall ufe the names, however, as we find them. Dire&ly under the place where the tubecles of one fide are united to thofe of the other fide, lies the iter ad quartum ventrtculum, which communicates by its anterior opening with the third ventricle, under the thalami nervorum opti- corum, and, by its pofterior opening, with the fourth ventri- cle, which belongs to the cerebellum. Fcratncn commune pojierius. Where the convex parts of the two anterior tubercles join thefe pofterior convex parts of the thalami nervorum opticorum, an interftice or opening is left between thefe four convexities •, but it does not com- municate with the third ventricle, for the bottom of it is Ihut up by the pia mater. The name of amis is applied to it, Glandula pinealis. The glandula pinealis is a {mall foft greyifii body, about the fize of an ordinary pea, irregularly round, and fometimes of the figure of a pine-apple, fituatcd behind the thalami nervorum opticorum above the lubercula quadrigemina. It is fixed like a fmall button to the lower part of the thalami, by two very white medullary pedunculi, which, at the gland, are very near each other, but feparatc almoft: tranfverfely toward the thalami. It feems to be moftly of a cortical fubftance, except near the footftalks, where it is fomewhat medullary. The foot- ftalks are fometimes double, as if they belonged to the two anterior tubercles. This body adheres very clofe to the plexus choroides, by which it is covered, as we fliall fee here- after •, and it therefore requires fome dexterity to feparate it from the glandula, without altering its fituation, or breaking the pedunculi. This gland has been often found to contain gravel. Below the glandula pinealis there is a medullary tranfverfe cord, called the pojicrior commijfure of the hemifpheres »f the cerebrum.