Terminal nerve in the mouse‐eared bat (<i>Myotis myotis</i>): Ontogenetic aspects

Jastrow, Holger; Oelschläger, Helmut

doi:10.1002/ar.a.20390

Cited by 2 publications

(1 citation statement)

References 85 publications

(141 reference statements)

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“…Also, some confusion arises over the term spina mesethmoidalis. Its use is limited to embryology or chondrocranium (Zeller, 1987;Silva Neto, 2000;Jastrow and Oelschl€ ager, 2006;Schunke and Zeller, 2010;St€ oßel et al, 2010;Ruf et al, 2015), but Domning (1978) and Gingerich (1994) referred to the spina mesethmoidalis in adult fossil sirenians, and Arnold and Heinsohn (1996) used the term for a grown individual of the Irrawaddy dolphin Orcaella brevirostris.…”

Section: Mesethmoid and Presphenoidmentioning

confidence: 99%

The ethmoid and presphenoid of cetaceans

Ichishima

2016

Journal of Morphology

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A cribriform plate, a perpendicular plate, and two lateral masses are major components of the ethmoid bone of mammals. Notwithstanding the noticeable bone, virtually sitting in the center of the skull, extensive modifications of the skull of modern cetaceans, especially odontocetes (toothed whales), and the lack of clarity as to what characteristics delimit each element of the ethmoid has made the problem of the nature of the cetacean ethmoid more complicated and elusive than in other, less modified mammals. Furthermore, contention as to whether a perpendicular plate of the ethmoid, or the mesethmoid, exists in all mammals including cetaceans has remained unsettled. In odontocetes, the mesethmoid has been variably identified not only as the osseous nasal septum but also as the mediodorsal region of the posterior wall of the nasal passage below the nasals, as a mass of bone encased by the vomer in front of the osseous nasal cavity at the base of the rostrum, and as a combination of some portions mentioned above. The presence or absence of the mesethmoid in various groups of mammals has attracted the attention of some biologists, and here, I demonstrate that cetaceans have no mesethmoid. The close inspection of the ontogenetic changes of the basicranial elements in cetaceans reveals that a mass of bone ensheathed by the vomer in front, or at the level of the osseous nasal cavity is actually the presphenoid. It is highly likely that in odontocetes the posterior wall of the nasal passages below the nasals consists of the combination of the frontal, the imperforated cribriform plate, the paired ectethmoids, and the vomer, the latter three of which partially concealing the presphenoid dorsally and laterally as the ontogeny proceeds. In contrast, mysticetes clearly display ethmoturbinates and a cribriform plate, which are morphologically similar to those in terrestrial mammals. J. Morphol. 277:1661-1674, 2016. © 2016 Wiley Periodicals, Inc.

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Section: Mesethmoid and Presphenoidmentioning

confidence: 99%

The ethmoid and presphenoid of cetaceans

Ichishima

2016

Journal of Morphology

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Functional microanatomy of the vomeronasal complex of bats

Smith,

Downing,

Rosenberger

et al. 2024

The Anatomical Record

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Recently, Yohe and Krell (The Anatomical Record, vol. 306:2765–2780) lamented the incongruence between genetics and morphology in the vomeronasal system of bats. Here, we studied 105 bat species from 19 families using histology, iodine‐enhanced computed tomography (CT), and/or micro‐CT. We focused on structural elements that support a functional peripheral vomeronasal receptor organ (vomeronasal organ [VNO]), together comprising the “vomeronasal complex.” Our results support prior studies that describe a functional VNO in most phyllostomid bats, miniopterids, and some mormoopids (most known Pteronotus spp.). All of these species (or congeners, at least) have vomeronasal nerves connecting the VNO with the brain and some intact genes related to a functional VNO. However, some bats have VNOs that lack a neuroepithelium and yet still possess elements that aid VNO function, such as a “capsular” morphology of the vomeronasal cartilages (VNCs), and even large venous sinuses, which together facilitate a vasomotor pump mechanism that can draw fluid into the VNO. We also show that ostensibly functionless VNOs of some bats are developmentally associated with ganglionic masses, perhaps involved in endocrine pathways. Finally, we demonstrate that the capsular VNC articulates with the premaxilla or maxilla, and that these bones bear visible grooves denoting the location of the VNC. Since these paraseptal grooves are absent in bats that have simpler (bar‐shaped or curved) VNCs, this trait could be useful in fossil studies. Variable retention of some but not all “functional” elements of the vomeronasal complex suggests diverse mechanisms of VNO loss among some bat lineages.

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Terminal nerve in the mouse‐eared bat (Myotis myotis): Ontogenetic aspects

Cited by 2 publications

References 85 publications

The ethmoid and presphenoid of cetaceans

The ethmoid and presphenoid of cetaceans

Functional microanatomy of the vomeronasal complex of bats

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