An atlas of the medulla and midbrain : a laboratory manual / by Florence R. Sabin ; edited by Henry McE. Knower.

  • Florence R. Sabin
Date:
1901
Catalogue details

Licence: In copyright

Credit: An atlas of the medulla and midbrain : a laboratory manual / by Florence R. Sabin ; edited by Henry McE. Knower. Source: Wellcome Collection.

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    The second bundle leaves the lateral funiculus a little farther cerebralward (Plate v, Fasciculus lateralis [2]). It passes obliquely toward the midline and is represented in the model as stopping abruptly against the root of the N. hypoglossus. In reality the fibres pass on between the root bundles of the nerve adjacent to the medial lemniscus (Fig. 19, F. 1.). In some of the sections it is possible to trace the fibres of this bundle through the parts of the medial accessory olive into the lemniscus medialis. Other fibres pass out into the proximal lobe of the nucleus olivaris inferior, the wall of which they do not appear to penetrate. The shape of this second bundle in the model is peculiar, for the dorsal fibres do not appear to come from the lateral funiculus at all. They represent a little group of fibres which come from the forma- tio reticularis and pass with the bundle in question toward the area of the medial lemniscus. As the bundle is crossing from the lateral funiculus toward the middle line a small group of fibres becomes separated from the mesial surface of the main mass, passes parallel to it for a short distance and then joins with it again. It cannot be seen in the lateral views given in the plates, but it shows in Figs. 19 and 28. It is not labeled in either section but is a small bundle of fibres within the trough. (In Fig. 19 the line F. a. 1. passes through it.) Its meaning I do not know. To return to the main bundle, the model shows the following points: (1) The bundle is connected with the lateral funiculus of the cord; (2) it does not decussate in the medulla oblongata; (3) it runs parallel to the medial lemniscus at the level of the inferior olive; (4) its fibres appear to join the lemniscus in part and in part to turn toward the olive, beyond which they cannot be traced in these preparations. If this bundle joins the lemniscus medialis it may represent, a sen- sory path from the lateral funiculi which does not decussate in the medulla oblongata. The two bundles just described receive the medial and ventral fibres of the fasciculus ventrolateralis (Text-Fig. 1). The lateral fibres pass onward to a point opposite the distal end of the inferior olive, where the bundle divides into two parts (Plates 1v and v). This statement is made without regard to the direction of the -axones of the fibres. The larger and medial of these two bundles extends between the lateral funiculus of the cord and the lemniscus lateralis (Plates 1v and v). It does not join the lemniscus, but Fibres to medial lemniscus. Fibres from Deiter’s nucleus to the spinal cord.