Tectorial Membrane and Otolithic Membrane of Pigeon Inner Ear. A Scanning Electron Microscope Study

Hoshino, Tomoyuki

doi:10.1679/aohc1950.35.141

Cited by 11 publications

(2 citation statements)

References 9 publications

(10 reference statements)

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“…It is less complex than the mammalian TM, in that it contains no collagens (Lim and Reuda, 1992). Cross-sectional data show the TM to be thicker on the neural edge of the BP compared to the abneural edge (Hoshino, 1973;Jahnke et al, 1969). The TM also displays a similar gradient in width to that observed in the BM, which becomes thicker towards the apex .In contrast to the mammalian cochlea, the tallest stereocilia of each hair cell and microvilli on the lumenal surfaces of supporting cells are coupled to the TM (Dohlman, 1971).…”

Section: Tectorial Membranementioning

confidence: 90%

Development of tonotopy in the auditory periphery

Mann

Kelley

2011

Hearing Research

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Section: Tectorial Membranementioning

confidence: 90%

Development of tonotopy in the auditory periphery

Mann

Kelley

2011

Hearing Research

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“…These globular and bulbous cytoplasmic processes were also reported in new born kitten. [ 41 ] However, transmission electron microscopy observations in human fetus[ 42 ] reveals that these globular structures are projections from the cuticular plate of the hair cells with direct continuation of the plasma membrane and that auditory stereocilia are differentiated from them. We observed initiation of stereociliogenesis at 16 GW, first in the IHC and later in the OHC which is similar to a previous description.…”

Section: Discussionmentioning

confidence: 99%

Development of the hair cells of the human cochlea: A scanning electron microscopic study

Mishra¹,

Roy²,

Saini³

2023

J Microsc Ultrastruct

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Introduction: In the mammalian auditory system, the cochlea is the first to attain structural and functional maturity. Although ultrastructural details of the developing cochlea of lower animals have been elucidated in the last few decades, comprehensive studies on human cochlea are lacking. Materials and Methods: In the present investigation we studied the development and maturation of the hair cells of ten human fetal cochlea from gestational weeks (GW) 12 to 37 by scanning electron microscopy. Result: We observed undifferentiated hair cells possessing numerous surface projections and long kinocilium during GW 14. At GW16, the primitive hair cells were arranged in one inner and four outer rows and had globular apices indicating the initiation of stereocilia formation. By GW 22, the globular apices were replaced by linear stereocilia and occasional kinocillia. Mature hair cells with sterocilia were observed in the basal turn at 30th week of gestation. At GW 37, the stereocilia were arranged in a typical “V” shaped pattern at the middle and apical coil, while the stereocilia of the basal turn were shorter in length resembling the adult cochlea. The inner hair cells were long and slender while outer hair cells were pear shaped, kinocilium were absent and the tunnel of Corti were well formed. Conclusion: It is concluded that in human, the morphological maturation of the hair cells starts in the basal turn around GW 22 and continues till 37th week in the apical turn indicating that early maturation of the cochlea may have a role on development of the higher auditory pathway connections.

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Scanning electron microscope studies of the papilla basilaris of some turtles and snakes

Miller

1978

Am. J. Anat.

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The papillae basilares of three species of turtles and four species of snakes were studied by SEM. The papillae of turtle are relatively large among reptiles and are characterized by a long, horizontal middle section resting on wide basilar membrane. Both terminal ends of the papilla extend onto the surrounding limbus in the form of a forked or "T" -shaped end or as a curved, "hook"- like processes. Details vary with the species. In the three species of turtles studied, there were between 1,100 and 1,400 hair cells on a papilla. The tectorial membrane covering the horizontal portion of the papilla is heavy in appearance and tightly attached to the kinocilial bulbs. The terminal ends of the papilla are covered by a thin gelatinous material. In addition, mat-like tectorial network covers the supporting cells and extends from the microvilli of the supporting cells to the overlying tectorial membrane. All hair cells are unidirectionally and abneurally oriented. The supporting cell surfaces form a large part of the papilla and, thus, hair cell density is low. The papillae of the two boid snake species studied are moderately long among snakes and contain a moderate number of hair cells (574 in Epicrates and 710-780 in Constrictor). Papillar form is elongate, avoid, or canoe-shaped. The tectorial membrane may be either highly fenestrated or moderately dense and covers all but a few of the terminal hair cells. A tectorial-like mat covers all but a few of the terminal hair cells. Most hair cells are unidirectionally and abneurally oriented. A few terminal cells in boids may show reverse orientation. Hair cell density is similar to that of turtles.

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Tectorial Membrane and Otolithic Membrane of Pigeon Inner Ear. A Scanning Electron Microscope Study

Cited by 11 publications

References 9 publications

Development of tonotopy in the auditory periphery

Development of tonotopy in the auditory periphery

Development of the hair cells of the human cochlea: A scanning electron microscopic study

Scanning electron microscope studies of the papilla basilaris of some turtles and snakes

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