Fetal cortical transplants reduce motor deficits resulting from neonatal damage to the rat's frontal cortex.

Motor deficits in the execution of grasping movements of the right forelimb were compared in normal female Wistar rats, in animals which sustained a neonatal lesion of the left frontal cortex and in animals which received immediately after the lesion a transplant obtained from the frontal cortex of E16 embryos. Behavioral testing was carried out from postnatal day 48 (D48) to D108. The animals were placed at the center of a circular wire grid which was turned upside down so that they hung by their 4 paws at a distance of 40 cm above the floor. The precision of grasping movements of the right limb and the number of falls were recorded during a 1 min session of active moving across the grid. The lesioned subjects were most impaired on both motor indices whereas the grafted animals although performing slightly poorer than the controls were, however, less impaired than the lesioned animals. Fetal cortical transplants, therefore, seem to promote functional recovery from neonatal cortical damage.