The spindle neurons are present in the cingulate cortex of chimpanzee fetus

We report the existence of the spindle neurons in layer Vb of the anterior cingulate cortex (Brodman's area 24b) in a chimpanzee fetus (embryonic day 224), which was stillborn. About 5.3% of neuronal cells in layer Vb were th e spindle neurons at this stage. The width of the spindle neurons was 10-15 mum. In layer V of the prefrontal cortex (Brodman's area 46) in the chimpa nzee fetus, and in layer Vb of the cingulate cortex in adult macaque monkey s, no spindle neurons were observed. The immunoreactivity against brain-der ived neurotrophic factor (BDNF) was detected only in the pyramidal neurons at this stage. These findings suggest that the existence of the spindle neu rons in layer Vb of the anterior cingulate cortex and the presence of BDNF in the pyramidal neurons are intrinsically characterized during the embryon ic stage of the chimpanzee. (C) 2001 Elsevier Science Ireland Ltd. All righ ts reserved.