Efferent fiber projections of the habenula and the interpeduncular nucleus. An experimental study in the opossum and cat |
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Authors: | L A Smaha W W Kaelber |
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Institution: | (1) Departments of Anatomy and Neurology, The University of Iowa, Iowa City, Iowa, USA |
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Abstract: | Summary A study of efferent fiber connections of the habenula and the inter-peduncular nucleus was conducted using anterograde degeneration techniques. Lesions were placed in the habenula of the opossum and the habenula and interpeduncular nucleus of the cat. Degeneration was studied by means of the Nauta and Fink-Heimer techniques.Fibers from the habenular nucleus of the opossum extended caudally and were traced bilaterally to the interpeduncular nucleus, dorsal tegmental nucleus of Gudden, deep (ventral) tegmental nucleus of Gudden, nucleus centralis superior and nucleus reticularis tegmenti pontis. Rostrally fibers were traced to the preoptic and septal region and the anterior and lateral hypothalamus.The medial and lateral habenular nuclei of the cat projected differentially to portions of the interpeduncular nucleus and the tegmental nuclei of Gudden. The medial habenular nucleus sent fibers to the paramedian subnucleus of the interpeduncular nucleus and to the deep tegmental nucleus; whereas the lateral habenular nucleus distributed to the apical and central subnuclei of the interpeduncular nucleus and the dorsal tegmental nucleus.Fibers from both the medial and lateral habenular nuclei were found to project bilaterally to the nucleus paraventricularis anterior, nucleus ventralis anterior, anterior medialis and anterior dorsalis of the thalamus, and the septal area.Fibers from the interpeduncular nucleus of the cat were represented bilaterally. Those passing rostral went to the lateral habenular nucleus, nucleus centromedianus and parafascicularis of the thalamus, and to the septal area. Those directed caudally projected to the nucleus centralis superior, and the dorsal and deep tegmental nucleus of Gudden.Abbreviations AC
anterior commissure
- AD
nucleus anterior dorsalis
- AM
nucleus anterior medialis
- AV
nucleus anterior ventralis
- BC
brachium conjunctivum
- CC
corpus callosum
- CD
caudate nucleus
- CI
internal capsule
- CL
nucleus centralis lateralis
- CM
nucleus centromedianus
- CP
cerebral peduncle
- DT
dorsal tegmental nucleus (of Gudden)
- EN
entopeduncular nucleus
- Fx
fornix
- GC
central gray
- GL
lateral geniculate nucleus
- GM
medial geniculate nucleus
- GP
globus pallidus
- HbPt
habenulopeduncular tract
- HVM
ventromedial hypothalamic nucleus
- IC
inferior colliculus
- IP
interpeduncular nucleus
- LHb
lateral habenular nucleus
- LL
lateral lemniscus
- LMN
lateral mammillary nucleus
- LP
nucleus lateralis posterior
- MD
nucleus medialis dorsalis
- MHb
medial habenular nucleus
- ML
medial lemniscus
- MMN
medial mammillary nucleus
- MP
mammillary peduncle
- NCM
nucleus centralis medialis
- OC
optic chiasm
- OT
optic tract
- Pf
nucleus parafascicularis
- Pul
pulvinar
- PUT
putamen
- RE
nucleus reuniens
- RN
red nucleus
- RPO
preoptic area
- RTP
nucleus reticularis tegmenti pontisv (von Bechterew)
- S
stria medullaris
- SC
superior colliculus
- SN
substantia nigra
- SPT
septal area
- VA
nucleus ventralis anterior
- VL
nucleus ventralis lateralis
- VM
nucleus ventralis medialis
- VPL
nucleus ventralis posterolateralis
- VPM
nucleus ventralis posteromedialis
- VT
deep tegmental nucleus (of Gudden)
- II
optic nerve |
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Keywords: | Habenula Interpeduncular nucleus Nauta technique Fink-Heimer technique Efferent projections |
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