Discipline: Veterinary Medicine
The medullary and cuticular patterns of guard hair obtained from various body regions of male and female Southeastern Asian house mouse and Asian musk shrew (bubuwit) were examined using light and scanning electron microscopy (SEM), respectively. The study showed differences in the medullary and cuticular patterns between the house mouse and musk shrew. The predominant medullary pattern observed in both sexes were wide aeriform lattice in the house mouse and wide truncated continuous in the musk shrew. Wide truncated continuous medullary pattern was noted on guard hairs from the forelimb and corn pound flattened discontinuous pattern from the hindlimb of female house mouse while wide spiral continuous and narrow nodose continuous patterns were observed in the male and female musk shrew. The medullary patterns could be of value in differentiating the two rodent species. The predominant cuticular pattern found in both sexes of the house mouse was imbricate except for the simple coronal on hairs from the dorsum and ventrum in male species. There appeared to be sexual dimorphism for imbricate crenate and serrate coronal cuticular patterns in the musk shrew because guard hairs from all sampling sites showed imbricate crenate in males and serrate coronal in females. Transversely oriented irregular, rectangular and triangular scales, with serrated or smooth dorsal margins were observed in both species. Except in the hindlimb of musk shrew where the scale margins were wider apart, there appeared to be no significant species difference between the distance of scale margins of hairs from other sampling sites.