Abstract
Under congenital thyroid hypofunction, the oro-facial large and small calcitonin gene-related peptide (CGRP) immunoreactive motoneurons were classified into strong, moderate, weak and negative intensity in offspring weaned rats. While 50% of neurons in the trigeminal motor nucleus (Mo5) were of the large type, this value dropped to 30% in hypothyroid pups. Hypothyroid trigeminal accessory nucleus (Mo5-AC) contained 10% large motoneurons versus about 45% in normal pups. Normal facial nucleus (Mo7) had 20% large motoneurons in contrast with 10% in hypothyroid pups. These values are significant in comparison with the normal pattern of oro-facial CGRP positive immunoreactive motoneurons as well as those devoid of immunostaining.
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