Summary
The inner ear of Rana t. temporaria comprises sensory structures with various special functions, i.e., the detection of spatial orientation (utricle, saccule, lagena), of rotation (ampullae), and of acoustic signals (amphibian and basilar papillae). In each of these structures, there is a sensory epithelium made up of hair (sensory) cells and supporting cells. As the supporting cells differentiate, they produce the organic matrix of the otoconia in the gravity-sensing organs, the ground substance of the cupulae in the ampullae, and the ground substance of the tectorial membranes in the auditory papillae. The supporting cells associated with these various derivative structures have correspondingly different cytoplasmic properties. The preotoconia are formed by extrusion; the otoconia develop from these filamentous precursors by growth and calcium deposition. The organic material that forms the cupulae and tectorial membranes is released from the supporting cells by exocytosis. The organization of this material into the ground substance is initiated mainly around the distal ends of the hair-cell kinocilia, eventually giving rise to the marked morphological differences that distinguish the cupulae from the tectorial membranes.
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Abbreviations
- bb :
-
basal body
- c :
-
cilia
- ca :
-
crista ampullaris
- ch :
-
chromosome
- cu :
-
cupula
- d :
-
dictyosome
- hc :
-
hair cell
- kc :
-
kinocilia
- ld :
-
lipid droplet
- m :
-
mitochondrion
- ma :
-
main axis
- mb :
-
multilamellated body
- mc :
-
macula communis
- mi :
-
mitosis
- mv :
-
microvillus
- n :
-
nucleus
- on :
-
organic net
- pa :
-
amphibian papilla
- pb :
-
basilar papilla
- pg :
-
pigment granule
- po :
-
preotoconia
- rer :
-
rough endoplasmic reticulum
- s :
-
saccule
- sc :
-
supporting cell
- sci :
-
stereocilia
- sd :
-
spot desmosome
- t :
-
tegmentum
- tf :
-
tonofilaments
- tj :
-
tight junction
- tm :
-
tectorial membrane
- yp :
-
yolk platelet
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Hertwig, I., Schneider, H. Development of the supporting cells and structures derived from them in the inner ear of the grass frog, Rana temporaria (Amphibia, Anura). Zoomorphology 106, 137–146 (1986). https://doi.org/10.1007/BF00312202
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DOI: https://doi.org/10.1007/BF00312202