Ontogenetic transformation of the cartilaginous nasal capsule in mammals, a review with new observations on bats

Smith, Timothy D.; Ruf, Irina; DeLeon, Valerie B.

doi:10.1002/ar.25152

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…Large parts of the middle and posterior chondrification centers ossify. The posterior transversal lamina fuses with the vomer in many species (= lamina terminalis); the lamina cribrosa ossifies as well and becomes part of the ethmoid bone (Ruf 2020;Smith et al 2023). Individual turbinals ossify in mammals (e.g., frontoturbinals, ethmoturbinals).…”

Section: (A) Development Of Nasal Structures In Mammalsmentioning

confidence: 99%

Turbinal bones are still one of the last frontiers of the tetrapod skull: hypotheses, challenges and perspectives

Martinez¹,

Amson²,

Ruf³

et al. 2023

Preprint

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Turbinals are bony or cartilaginous structures that are present in the nasal cavity of most tetrapods. They are involved in key functions such as olfaction, heat, and moisture conservation, as well as protection of the respiratory tract. Despite recent studies that challenged long standing hypotheses about their physiological and genomics correlation, turbinals remain largely unexplored. This is especially true for non-mammalian species. We reviewed and synthesized the current knowledge of turbinals by an integrative approach that includes comparative anatomy, physiology, histology and genomics. This provides a strong basis to develop new research avenues. In addition, we provide synonyms and correspondences of turbinals at the scale of tetrapods from about 80 publications. This work represents a first step towards drawing hypotheses of homology for the whole clade.

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Section: (A) Development Of Nasal Structures In Mammalsmentioning

confidence: 99%

Turbinal bones are still one of the last frontiers of the tetrapod skull: hypotheses, challenges and perspectives

Martinez¹,

Amson²,

Ruf³

et al. 2023

Preprint

View full text Add to dashboard Cite

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Craniogenetic studies in Sus scrofa: With emphasis on the ‘orbitosphenoid’ problem

Maier

Lächele

Ruf

2023

The Anatomical Record

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The orbitosphenoid is a skeletal element of the endocranium of extant mammals. However, it has also been described in many of their fossil ancestors. Craniogenetic studies show that it is composed of two types of bone: first, the cartilaginous ala orbitalis and parts of the trabecular plate are transformed by endochondral ossification; second, so‐called ‘appositional bone’ (‘Zuwachsknochen’) arises directly from the perichondrium of the two optic pilae and spreads in all directions and overlays the remaining cartilage and the endochondral ossifications. For some time, both bone types can be distinguished microscopically, but later in craniogenesis they fuse completely to become the presphenoid sensu lato of the osteocranium. We interpret the ‘appositional bone’ as neomorphic mode to reinforce the endocranial bone structures, which are the ossification of the delicate cartilaginous template of the chondrocranium. We studied the ossifications of the presphenoidal skull region in a series of ontogenetic stages of the pig Sus scrofa. We applied conventional histology as well as stained and unstained μCT scans. We can show the above‐mentioned modes of ossification, and we can demonstrate the contribution of ‘appositional bone’ well into neonatal and infantile stages. The ossifications of the presphenoid (including the orbitosphenoid) are very slender in therapsids and early mammaliaforms as previously described by other authors. In mammaliaforms, they tend to become thicker and closely connected with the frontal bone, which may be due to the contribution of neomorphic appositional bone. We assume that thereby the presphenoid sensu lato becomes an enforcement of the orbital pillars.

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Disparity of turbinal bones in placental mammals

Martinez,

Wright,

Dubourguier

et al. 2024

The Anatomical Record

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Turbinals are key bony elements of the mammalian nasal cavity, involved in heat and moisture conservation as well as olfaction. While turbinals are well known in some groups, their diversity is poorly understood at the scale of placental mammals, which span 21 orders. Here, we investigated the turbinal bones and associated lamellae for one representative of each extant order of placental mammals. We segmented and isolated each independent turbinal and lamella and found an important diversity of variation in the number of turbinals, as well as their size, and shape. We found that the turbinal count varies widely, from zero in the La Plata dolphin, (Pontoporia blainvillei) to about 110 in the African bush elephant (Loxodonta africana). Multiple turbinal losses and additional gains took place along the phylogeny of placental mammals. Some changes are clearly attributed to ecological adaptation, while others are probably related to phylogenetic inertia. In addition, this work highlights the problem of turbinal nomenclature in some placental orders with numerous and highly complex turbinals, for which homologies are extremely difficult to resolve. Therefore, this work underscores the importance of developmental studies to better clarify turbinal homology and nomenclature and provides a standardized comparative framework for further research.

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Ontogenetic transformation of the cartilaginous nasal capsule in mammals, a review with new observations on bats

Cited by 3 publications

References 57 publications

Turbinal bones are still one of the last frontiers of the tetrapod skull: hypotheses, challenges and perspectives

Turbinal bones are still one of the last frontiers of the tetrapod skull: hypotheses, challenges and perspectives

Craniogenetic studies in Sus scrofa: With emphasis on the ‘orbitosphenoid’ problem

Disparity of turbinal bones in placental mammals

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