Collection: Brain of fishes (Pisces)

Species: Acipenser baerii Brandt, 1869    Pisces

Description: Frontal (transversal) paraffin section through a telencephalic hemisphere of the Siberian sturgeon Acipenser baerii Brandt, 1869 stained with cresyl violet by the Nissl method. The section shows the overall cytoarchitecture of an everted-type hemisphere. The section also clearly shows that fishes have only the median ventricle. The neurons are clustered near the surface of the brain and as they migrate deeper into the brain they form a layered structure in the dorsal regions. In the ventral (subpallial) areas, the neurons are even more concentrated near the median ventricle. This type of brain development complicates the comparison with the brains of other vertebrates and suggests that the CNS of this group of fishes (ray-finned fishes) has evolved along its own distinct path.

Comments: none

Organs: сentral nervous system, cerebral brain or its part

Methods: Neurohistology - Nissl staining

Publications: none

Microscope: Leica DM 6000 with DFC 5000 EC3 camera