Abstract
A study of septotectal projections was undertaken to explain the presence of degenerating terminals in the inferior colliculus following electrolytic lesions in the septum of the cat. Axonal degeneration was studied in parasagittal sections stained with silver. Projections from the septum to the midbrain tectum were traced dorsally through the stria medullaris thalami, stratum zonale of the thalamus, and midbrain tectum to the brachium of the inferior colliculus. Ventral projections were traced from the septum to the thalamic stratum zonale, external medullary lamina, and inferior thalamic peduncle. This degeneration was continuous with that observed near the thalamic fasciculus and internal capsule ventral to the medial geniculate body. Degenerating fibers were traced through the brachium of the inferior colliculus to the capsule of the inferior colliculus. Degenerating terminals were observed in the posterior ventral part of the inferior colliculus. These results reveal anatomical pathways from the septum to the midbrain tectum. The pathways could provide routes over which after-discharge and evoked potentials recorded from the midbrain tectum and central gray could travel. It is possible that these connections are utilized in modulation of limbic influence on afferent modalities and efferent motor control mediated via the midbrain tectum.
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