TY - JOUR
T1 - Lobular homology in cerebellar hemispheres of humans, non-human primates and rodents
T2 - a structural, axonal tracing and molecular expression analysis
AU - Luo, Yuanjun
AU - Fujita, Hirofumi
AU - Nedelescu, Hermina
AU - Biswas, Mohammad Shahangir
AU - Sato, Chika
AU - Ying, Sarah
AU - Takahashi, Mayu
AU - Akita, Keiichi
AU - Higashi, Tatsuya
AU - Aoki, Ichio
AU - Sugihara, Izumi
N1 - Funding Information:
The authors thank Dr. Jan Voogd for his valuable comments to the manuscript, as well as, Dr. Enrico Marani for sending us a critical reference on mouse cerebellar morphology, Drs. Takafumi Minamimoto (NIRS) and Arata Oh-Nishi (NIRS) for providing the macaque (Japanese monkey) specimen, Dr. A. O.-N. for discussion, Nobuhiro Nitta (NIRS) for technical assistance in the MR imaging experiments, Prof. Emi Schinzinger for interpreting German literature, Gideon Anokye Sarpong for reading the manuscript, and Mr. Minoru Takada for technical assistance. This study was supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (KAKENHI; to I.S., 16K070025, 26•04381; to H.F., 26430035; to I.A., 24300167) and COI STREAM Grant of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (to I.A.). Y.L. was a recipient of the TMDU self-financing international student special research grant and is a recipient of the MEXT scholarship. H.F. was supported by the JSPS postdoctoral fellowship for research abroad. M.S.B. is a recipient of the MEXT scholarship. S.Y. is a recipient of the JSPS invitation fellowship for Research in Japan (Short-Term). H.N. is a recipient of the JSPS Postdoctoral Fellowship for Overseas Researchers.
Publisher Copyright:
© 2017, Springer-Verlag Berlin Heidelberg.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Comparative neuroanatomy provides insights into the evolutionary functional adaptation of specific mammalian cerebellar lobules, in which the lobulation pattern and functional localization are conserved. However, accurate identification of homologous lobules among mammalian species is challenging. In this review, we discuss the inter-species homology of crus I and II lobules which occupy a large volume in the posterior cerebellar hemisphere, particularly in humans. Both crus I/II in humans are homologous to crus I/II in non-human primates, according to Paxinos and colleagues; however, this area has been defined as crus I alone in non-human primates, according to Larsell and Brodal. Our neuroanatomical analyses in humans, macaques, marmosets, rats, and mice demonstrate that both crus I/II in humans are homologous to crus I/II or crus I alone in non-human primates, depending on previous definitions, and to crus I alone in rodents. Here, we refer to the region homologous to human crus I/II lobules as “ansiform area (AA)” across animals. Our results show that the AA’s olivocerebellar climbing fiber and Purkinje cell projections as well as aldolase C gene expression patterns are both distinct and conserved in marmosets and rodents. The relative size of the AA, as represented by the AA volume fraction in the whole cerebellum was 0.34 in human, 0.19 in macaque, and approximately 0.1 in marmoset and rodents. These results indicate that the AA reflects an evolutionarily conserved structure in the mammalian cerebellum, which is characterized by distinct connectivity from neighboring lobules and a massive expansion in skillful primates.
AB - Comparative neuroanatomy provides insights into the evolutionary functional adaptation of specific mammalian cerebellar lobules, in which the lobulation pattern and functional localization are conserved. However, accurate identification of homologous lobules among mammalian species is challenging. In this review, we discuss the inter-species homology of crus I and II lobules which occupy a large volume in the posterior cerebellar hemisphere, particularly in humans. Both crus I/II in humans are homologous to crus I/II in non-human primates, according to Paxinos and colleagues; however, this area has been defined as crus I alone in non-human primates, according to Larsell and Brodal. Our neuroanatomical analyses in humans, macaques, marmosets, rats, and mice demonstrate that both crus I/II in humans are homologous to crus I/II or crus I alone in non-human primates, depending on previous definitions, and to crus I alone in rodents. Here, we refer to the region homologous to human crus I/II lobules as “ansiform area (AA)” across animals. Our results show that the AA’s olivocerebellar climbing fiber and Purkinje cell projections as well as aldolase C gene expression patterns are both distinct and conserved in marmosets and rodents. The relative size of the AA, as represented by the AA volume fraction in the whole cerebellum was 0.34 in human, 0.19 in macaque, and approximately 0.1 in marmoset and rodents. These results indicate that the AA reflects an evolutionarily conserved structure in the mammalian cerebellum, which is characterized by distinct connectivity from neighboring lobules and a massive expansion in skillful primates.
KW - Ansiform lobule
KW - Cerebellum
KW - Crus I
KW - Magnetic resonance imaging
KW - Marmoset
KW - Semilunar lobule
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U2 - 10.1007/s00429-017-1436-9
DO - 10.1007/s00429-017-1436-9
M3 - Review article
C2 - 28508291
AN - SCOPUS:85019246544
SN - 1863-2653
VL - 222
SP - 2449
EP - 2472
JO - Brain Structure and Function
JF - Brain Structure and Function
IS - 6
ER -