Inferior olive medial accessory subnucleus

Fig. 142, Lateral extension of zone A in the posterior lobe with its projection to the dorsolateral protuberance (dip) of the fastigial nucleus in the rat. The cumulative results of 8 injections of WGA-HRP in the posterior lobe are illustrated. The injection sites are represented as grey areas in B and the corresponding afferent and efferent connections are represented in black in A (inferior olive) and C (cerebellar nuclei), respectively. Dots indicate single labelled neurones in A and few sparsely labelled terminals in C. The lateral extension of the A zone receives a projection from the medial subnucleus c of the caudal medial accessory olive (MAO A2-7). Buisseret-Delmas (1988a)...

Fig. 158. Diagram of the inferior olive of the rat. A. Transverse sections 1-13 from caudal to rostral. B. Key to reconstruction of panel C. C. Flattened reconstruction of the inferior olive according to the method of Brodal (1940). Beta = subnucleus beta DAO = dorsal accessory olive DC = dorsal cap DLPO = dorsal leaf of the PO DM = dorsomedial group MAO= medial accessory olive PO = principal nucleus of the inferior olive VLO = ventrolateral outgrowth VLPO = ventral leaf of the PO. Ruigrok and Voogd (1990).

Fig. 166. The innervation of the inferior olive of the rat by catecholaminergic, serotoninergic, substance P, and gamma-aminobutyric acid decarboxylase (GAD)-immunoreactive fibers and the distribution of acetylcholinesterase (AChE). a = subnucleus a of the medial accessory olive b = subnucleus b of the medial accessory olive beta = subnucleus beta DAO = dorsal accessory olive dc = dorsal cap dl = dorsal eaf principal olive DM = dorsomedial subnucleus dmcc = dorsomedial cell column MAO = medial accessory olive PO = principal olive vl = ventral leaf principal olive vlo = ventrolateral outgrowth XII = hypoglossal nerve.

Fig. 169. Diagram of the distribution of AChE in the inferior olive of the cat. A. Transverse sections, numbered from caudally to rostrally. B. Diagrams of the unfolded inferior olive. Black heavy staining stippled medium staining white low staining. Abbreviations DAO = dorsal accessory olive dc = dorsal cap dmcc = dor-somedial cell column MAO = medial accessory olive np = subnucleus beta PO = principal olive vio = ventrolateral outgrowth. Marani et al. (1977).

Fig. 172. Origin from the border region of the rostral and caudal medial accessory olive of the olivocerebellar projection to the electrophysiologically identified x zone in the cat, a = a zone b = b zone P = subnucleus beta cpCj = CpC, zones coll = inferior colliculus d, dj = d, and d2 zones dmcc = dorsomedial cell column MAO = medial accessory olive ml = midline pvg = lateral border of vermis x = x zone IV, V = lobules IV and V. Redrawn from Campbell and Armstrong (1985).

Fig. 185. The olivocerebellar projection to the pyramis and the uvula (lobules 8 and 9) of tbe rat cerebellum. A,B- Olivocerebellar projection zones of the lobules 8 and 9. C. Origin of these projections, indicated in diagrams of transverse sections through the inferior olive, a = subnucleus a of the medial accessory olive b = subnucleus b of the medial accessory olive beta = group beta c = subnucleus c of the medial accessory olive d = dorsal accessory olive dm = dorsomedial subnucleus m = medial accessory olive pr = principal olive 8 and 0 = lobules VIII and IX of Larsell. Relabelled and reproduced from Eisenman (1984).

Fig. 187. Olivocerebellar projection to the uvula based upon retrograde tracing experiments in the cat (Kanda et al. 1989). The bottom diagrams of the flattened inferior olive were reconstructed from their data, beta = subnucleus beta cMAO = caudal medial accessory olive dc = dorsal cap dlPO = dorsal leaf of the principal olive dmcc = dorsomedial cell column DU = dorsal folia uvula rMAO = rostral medial accessory olive vlo = ventrolateral outgrowth vlPO = ventral leaf of the prineipal olive VU = ventral folia uvula.

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