[MARMAM] MRI Atlas of Atlantic White-sided Dolphin Brain

Eric Montie emontie at marine.usf.edu
Mon Nov 19 12:00:30 PST 2007

Dear Interested Colleagues,
The following paper has recently been published:

Montie EW, Schneider GE, Ketten DR, Marino L, Touhey KE, and Hahn ME.
2007. Neuroanatomy of the subadult and fetal brain of the Atlantic
white-sided dolphin (Lagenorhynchus acutus) from in situ magnetic
resonance images. The Anatomical Record 290:1459-1479.

This article provides the first anatomically labeled, magnetic resonance
imaging (MRI) -based atlas of the subadult and fetal Atlantic
white-sided dolphin (Lagenorhynchus acutus) brain. It differs from
previous MRI-based atlases of cetaceans in that it was created from
images of fresh, postmortem brains in situ rather than extracted,
formalin-fixed brains. The in situ images displayed the classic
hallmarks of odontocete brains: fore-shortened orbital lobes and
pronounced temporal width. Olfactory structures were absent and auditory
regions (e.g., temporal lobes and inferior colliculi) were enlarged. In
the subadult and fetal postmortem MRI scans, the hippocampus was
identifiable, despite the relatively small size of this structure in
cetaceans. The white matter tracts of the fetal hindbrain and cerebellum
were pronounced, but in the telencephalon, the white matter tracts were
much less distinct, consistent with less myelin. The white matter tracts
of the auditory pathways in the fetal brains were myelinated, as shown
by the T2 hypointensity signals for the inferior colliculus, cochlear
nuclei, and trapezoid bodies. This finding is consistent with hearing
and auditory processing regions maturing in utero in L. acutus, as has
been observed for most mammals. In situ MRI scanning of fresh,
postmortem specimens can be used not only to study the evolution and
developmental patterns of cetacean brains but also to investigate the
impacts of natural toxins (such as domoic acid), anthropogenic chemicals
(such as polychlorinated biphenyls, polybrominated diphenyl ethers, and
their hydroxylated metabolites), biological agents (parasites), and
noise on the central nervous system of marine mammal species.

Please feel free to contact me (emontie at marine.usf.edu) for a pdf copy 
of this paper.

Eric W. Montie, M.S., Ph.D.

Eric W. Montie

Postdoctoral Fellow:
College of Marine Science								
University of South Florida (USF) 			
140 Seventh Avenue, South; Room 2121 					
St. Petersburg, FL  33701-5016					
Lab Phone: (727) 553-1193
Fax: (727) 553-1189
E-mail: emontie at marine.usf.edu

Guest Investigator:
Woods Hole Oceanographic Institution (WHOI)
Department of Biology; MS#32
Woods Hole, MA  02543
E-mail: emontie at whoi.edu

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