Acessory pathway

Light microscopic autoradiography and quantitative photometric studies of autoradiographs were performed subsequent to injection of tritiated amino acids into various parts of the amygdala of the rat. The course of amygdalofugal fibers in the stria terminalis (bilaterally), longitudinal association bundle, medial amygdalo-hypothalamic pathway, and medial forebrain bundle is described. Evidence is provided for both additional transcapsular and paracapsular fibers and early descending stria terminalis fibers...

Catheter-induced conduction delay or block in the accessory atrioventricular pathway of four patients with the preexcitation syndrome was observed. Block in the accessory pathway occurred during routine catheter placement and lasted from 90 seconds--14 hours. All of the pathways were in locations readily accessible to catheter trauma, located in the right anterior septal/paraseptal area in three patients, and in the posterior septum near the orifice of the coronary sinus in the fourth. The location of the acessory pathway was confirmed at surgery by endocardial mapping in three of the four patients...

By employing the autoradiographic method we have determined that the inferior olivary nucleus receives input from the reticular formation of the midbrain, pons and, probably, the medulla. The remarkable thing about such connections is that they are not diffuse, but targeted in large part on restricted portions of the caudal acessory nuclei. From our previous studies it is clear that some of the olivary regions receiving reticular input also receive projections from the cerebral cortex, the spinal cord and the dorsal column nuclei...