Summary
By means of retrograde axonal transport of fluorescent substances, e.g., Propidium Iodide, Fast Blue, and Nuclear Yellow, the present study was made to determine whether or not single neurons in the cat inferior colliculus share ascending and descending projections to the following two pairs of structures, i.e. (1) to the medial geniculate body and cochlear nuclei, and (2) to the superior colliculus and pontine nuclei. Our findings indicate that extremely few neurons, if any, in the inferior colliculus harbor such divergent axon collaterals, although most of the different types of projection neurons are located in the same subdivisions of the colliculus.
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Abbreviations
- BC:
-
Brachium conjunctivum
- BCI:
-
Brachium of IC
- BIN:
-
Nucleus of brachium of IC
- Bp:
-
Brachium pontis
- CN:
-
Central nucleus of IC
- CSC:
-
Commissure of SC
- DC:
-
Dorsal cochlear nucleus
- EN:
-
External nucleus of IC
- FLM:
-
Fusciculus lon-gitudinalis medialis
- FTC:
-
Central tegmental fields
- IC:
-
Inferior Colliculus
- ICO:
-
Commissure of IC
- L:
-
Left
- LL:
-
Lateral lemniscus
- MGB:
-
Medial geniculate body
- MGM:
-
Magnocellular portion of MGB
- MGP:
-
Parvocellular portion of MGB
- Ncs:
-
Nucleus centralis superior
- Ndl:
-
Dorsolateral pontine nucleus
- Nl:
-
Lateral pontine nucleus
- Nll:
-
Nucleus of lateral lemniscus
- Np:
-
Peduncular pontine nucleus
- Npm:
-
Paramedian pontine nucleus
- Nrt:
-
Nucleus reticularis tegmenti pontis
- Nv:
-
Ventral pontine nucleus
- O:
-
Stratum opticum
- OT:
-
Optic tract
- PAG:
-
Periaqueductal gray
- PC:
-
Posterior commissure
- Pc:
-
Pericentral nucleus of IC
- Ped:
-
Pedunculus cerebri
- Pt:
-
Pretectum
- PVC:
-
Posteroventral cochlear nucleus
- R:
-
Right
- RB:
-
Restiform body
- Rgc:
-
Nucleus reticularis gigantocellularis
- SAI:
-
Stratum album intermedium
- SC:
-
Superior colliculus
- SGI:
-
Stratum griseum intermedium
- SGP:
-
Stratum griseum profundum
- SGS:
-
Stratum griseum superficial
- Sn:
-
Substantia nigra
- vd:
-
Descending vestibular nucleus
- vl:
-
Lateral vestibular nucleus
- vm:
-
Medial vestibular nucleus
- III:
-
Oculomotor nucleus
- IVn:
-
Root fibers of the trochlear nerve
- Vst:
-
Trigeminal spinal tract
- VII:
-
Facial nucleus
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Hashikawa, T., Kawamura, K. Retrograde labeling of ascending and descending neurons in the inferior colliculus. A fluorescent double labeling study in the cat. Exp Brain Res 49, 457–461 (1983). https://doi.org/10.1007/BF00238787
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DOI: https://doi.org/10.1007/BF00238787