Postnatal growth and development in Sorex unguiculatus.

Structure and innervation of the papilla incisiva (papilla palatina) of the shrew, Sorex unguiculatus.

The structure and innervation of the papilla incisiva (papilla palatina) of the shrew, Sorex unguiculatus were studied by light and electron microscopy. The papillary region of the shrew consists of the papilla proper and two epithelial processes. The main part of the papilla, with the epithelial processes, lies anterior to the incisors and is thus in the vestibulum oris. The papilla is compose...

Isolation and characterization of polymorphic microsatellite DNA markers in two shrew species, Sorex unguiculatus and S. caecutiens

We isolated six microsatellite markers from the partial genomic libraries of two Sorex shrews, S. unguiculatus and S. caecutiens, and examined their allelic variation. All loci showed high allelic variation ranging from 15 to 19 alleles and all but one locus conformed to Hardy-Weinberg expectations in the species where the loci were isolated. Cross-species amplifications showed that all primers...

Postnatal development of spatial coding in the gravity sensing system

The critical maturation time of central otolith neurons in processing spatial orientations was examined in Sprague-Dawley rats. With the use of immuno-hybridization histochemical methods, we observed c-fos expression in vestibular nuclear neurons responding to transverse movement on the horizontal plane as early as P7 and those to antero-posterior stimulation as early as P9. In the inferior oli...

Alteration in postnatal development of masseter innervation in hypothyroid rats

The thyroid hormones have profound effects on the development of neuromuscular system. These hormones exert their influence on both muscle fibers and related motoneurons during development. Masseter is one of the most important muscles for mastication in mammals. Thyroid hormone deficiency 3 weeks after birth, the period in which an alteration from sucking to biting occurs, could influence the ...

Studies on the parasite fauna of insectivora I. Paracrenosoma takikawai n. sp. from Sorex unguiculatus Dobson in Hokkaido, Japan.