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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DOI: https://doi.org/10.1007/BF00315454