Guth P S, Fermin C D, Pantoja M, Edwards R, Norris C
Department of Pharmacology, Tulane University School of Medicine, New Orleans, LA 70112.
Hear Res. 1994 Feb;73(1):109-15. doi: 10.1016/0378-5955(94)90288-7.
The list of distinguishing morphological features of hair cells includes: Type I and Type II afferent innervation, and length, shapes and arrangements of stereo- and kinocilia. We now add to this list the shapes of the hair cells themselves and their placement within the mechanosensory organ, in this case the semicircular canal. Although hair cells of the crista ampullaris of the frog are only of Type II they may now be further classified into three sub-groups according to shape: club-, cigar- and pear-shaped. The cigar- and club-shaped hair cells are each about 40% while the pear-shaped cells are about 20% of the total numbers of hair cells in the crista. The differently-shaped hair cells also distribute differently along the crista. The cigar- and club-shaped are more-or-less uniformly distributed with somewhat higher concentrations at the ends of the crista than in the center. The pear-shaped hair cells, on the other hand, are mostly concentrated toward the center of the crista. This distribution of the pear-shaped hair cells, and their shape is reminiscent of the distribution of calyceal endings (Type I hair cell) in the cristae of amniotes [Goldberg et al., Hear. Res. 49, 89-102 (1990) in Chinchilla; Fernandez et al., Soc. Neurosci. Abstr. 17, 312 (1991) in Monkey]. There are some quantitative differences between hair cells of the same shape but from different portions of the crista. For instance, pear-shaped hair cells of the center are generally of greater cross-sectional area than those of the ends.(ABSTRACT TRUNCATED AT 250 WORDS)
I型和II型传入神经支配，以及静纤毛和动纤毛的长度、形状和排列方式。现在，我们在此列表中增加毛细胞本身的形状及其在机械感觉器官（在这种情况下是半规管）中的位置。尽管青蛙壶腹嵴的毛细胞仅为II型，但现在根据形状可进一步分为三个亚组：棒状、雪茄状和梨状。雪茄状和棒状毛细胞各约占嵴上毛细胞总数的40%，而梨状细胞约占20%。不同形状的毛细胞在嵴上的分布也不同。雪茄状和棒状毛细胞分布较为均匀，在嵴的两端浓度略高于中心。另一方面，梨状毛细胞大多集中在嵴的中心。梨状毛细胞的这种分布及其形状让人联想到羊膜动物嵴中杯状末梢（I型毛细胞）的分布[戈德堡等人，《听觉研究》49，89 - 102（1990年），针对毛丝鼠；费尔南德斯等人，《神经科学学会摘要》17，312（1991年），针对猴子]。同一形状但来自嵴不同部位的毛细胞之间存在一些数量差异。例如，中心部位的梨状毛细胞通常比末端的梨状毛细胞具有更大的横截面积。（摘要截断于250字）
