Imagine trying to understand a patient's brain without ever having seen a normal one. That's the challenge for scientists and veterinarians studying koalas, whose unique marsupial brains have never been fully mapped. Now, for the first time, researchers have created a detailed 3D picture of a koala's brain using high-resolution MRI scans from a single, naturally deceased female koala. They found the koala's brain is smooth-surfaced and has a total volume of about 15,720 cubic millimeters. The breakdown shows the cerebral hemispheres make up about 59% of the brain, the cerebellum about 15%, and the brainstem about 12%. The olfactory bulbs, important for smell, are about 2.7% of the total. The team also identified and measured a specific bundle of nerve fibers found only in marsupials. This detailed map is more than just an anatomical curiosity. Because koalas are endangered and brain specimens are scarce, this single scan provides a vital reference point. It can serve as a baseline for future studies on marsupial brain development and, importantly, as a guide for veterinarians interpreting clinical brain scans of sick or injured koalas in the wild.
MRI-based morphometric analysis reveals koala brain volume is 15720.98 mm³, with olfactory bulbs comprising 2.66%What does a koala's brain look like? First detailed MRI map reveals its unique marsupial structure
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This study provides a morphometric description of a mature female koala (Phascolarctos cinereus) brain based on segmentation of high-resolution magnetic resonance images. The brain of a single, naturally deceased koala was removed, fixed in 10% neutral buffered formaldehyde, and imaged using a 9.4 T Bruker Biospec MR system with a 3D multigradient echo sequence. AMIRA software was used for three-dimensional volume reconstruction and calculation of brain structure volumes. The koala brain is lissencephalic with a total volume of 15720.98 mm³. The volume of the olfactory bulbs was 418 mm³, representing 2.66% of the total brain volume. The cerebral hemispheres measured 9336.92 mm³ (59.39% of total brain volume). The interhemispheric connections were 148 mm³ (0.94% of total brain volume). The combined volume of the anterior commissure and fasciculus aberrans, a structure specific to marsupials, was also segmented and labeled. The ventricular system volume was 172 mm³ (1.09% of total brain volume). The brainstem volume was 1874 mm³ (11.92% of total brain volume). The cerebellum volume was 2304.69 mm³ (14.66% of total brain volume). The study notes that brain specimens from the endangered koala are scarce, and segmentation was performed on a single specimen. The authors conclude this data can serve as a basis for clinical imaging of koalas and as baseline data for future research into brain development of koalas and other marsupials.
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