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Projection from the inferior colliculus to the superior olivary complex in the albino rat

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Summary

The origin and termination of the fibers projecting from the inferior colliculus to the superior olivary complex have been studied in rat by means of the Fink and Heimer and horseradish peroxidase techniques (anterograde and retrograde transport of free horseradish peroxidase and peroxidase conjugated to wheat germ agglutinin). The colliculoolivary fibers originate in layer 3 of the external cortex and the adjacent part of the central nucleus, particularly in the former. Via the lateral lemniscus the fibers reach the ipsilateral periolivary region where they terminate in the rostral and medioventral zones. The terminal field contains at least two types of cells which could constitute the next link in the descending projection to the cochlea and/or the cochlear nuclei. One of these is the large olivocochlear neuron, and the other a smaller neuron projecting to the cochlear nuclei. Judged by their topographic relationship in the inferior colliculus and in the superior olive, the colliculoolivary neurons may form a link in a oligosynaptic projection from the auditory cortex to the cochlea and/or the cochlear nuclei. The observations are based on light microscopy, however, and do not allow conclusions concerning synaptic contacts.

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Abbreviations

A :

aqueduct

BIC :

brachium of IC

BC :

brachium conjunctivum

BP :

brachium pontis

Cb :

cerebellum

CN :

central nucleus of IC

CoIC :

commissure of IC

CoLL :

commissure of the lateral lemniscus

CP :

cerebral peduncle

CPO :

caudal zone of periolivary region

CR :

corpus restiforme

CS :

corticospinal tract

DC :

dorsal cortex of IC

DCN :

dorsal cochlear nucleus

DMPO :

dorsomedial zone of periolivary region

DNLL :

dorsal nucleus of the lateral lemniscus

EC :

external cortex of IC

IC :

inferior colliculus

INLL :

intermediate nucleus of the lateral lemniscus

IO :

inferior olivary complex

LL :

lateral lemniscus

LSO :

lateral nucleus of SO

LVPO :

lateroventral zone of periolivary region

ML :

medial lemniscus

MVPO :

medioventral zone of periolivary region

NTB :

nucleus of the trapezoid body

OP :

optic layer of SSC

P :

pyramidal tract

PAG :

periaqueductal grey

PN :

pontine nuclei

Re :

recess of IC

RF :

reticular formation

RPO :

costral zone of periolivary region

RS :

rubrospinal tract

SaS :

subarachnoidal space

SC :

superior colliculus

SO :

superior olivary complex

SPN :

superior periolivary nucleus

Sp5 :

trigeminal spinal tract

TB :

trapezoid body

VCN :

ventral cochlear nucleus

VD :

dorsal vestibular nucleus

VL:

lateral vestibular nucleus

VM :

medial vestibular nucleus

VNLL :

ventral nucleus of the lateral lemniscus

VR :

rostral vestibular nucleus

IV :

forth ventricle

1–3 :

layers of EC

5 :

trigeminal nucleus

5N :

trigeminal nerve

7 :

facial nucleus

7N :

facial nerve

8C :

cochlear nerve

8V :

vestibular nerve

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Faye-Lund, H. Projection from the inferior colliculus to the superior olivary complex in the albino rat. Anat Embryol 175, 35–52 (1986). https://doi.org/10.1007/BF00315454

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