Head pneumatic sinuses in Japanese quail and zebra finch

Tahara, Rui; Larsson, Hans C. E.

doi:10.1093/zoolinnean/zly089

Cited by 7 publications

(41 citation statements)

References 81 publications

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“…A brief overview of the anatomy of the paratympanic sinus system was presented above and a more complete description was presented by us earlier (Tahara & Larsson, ; Figure ). Prior to its mature development, topographical positions of the columella, stapedial artery, and paratympanic organ (PTO) are used here as key morphologies to help describe the early development of the paratympanic sinus and its associated soft tissues (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…With the exception of the epiotic diverticular region, the squamosal, parietal, and supraoccipital diverticula remain separated based on their sutures in quail. This indicates that each diverticulum occupies each bone first, and communicates with each other later over the squamosal–parietal and squamosal–frontal sutures based on the entirely pneumatized dorsal regions of the braincase in in a six‐week‐old quail (Tahara & Larsson, ; Figure ). This association between bony sutures and pneumatic diverticula is consistent with previous studies (Serventy, Nicholls, & Farner, ; Tahara & Larsson, ).…”

Section: Discussionmentioning

confidence: 99%

“…Paranasal sinuses are derived from the nasal cavity and expand throughout the anterior portion of the head. Paratympanic sinuses expand from the tympanic sinus throughout the posterior cranium and mandible with some expansions anteriorly adjacent to portions of the paranasal sinuses (Tahara & Larsson, ). The paranasal sinus system is composed of a series of divergent branches that remain distinct and extend through both soft tissues and bones (e.g., Tahara & Larsson, ; Witmer, ; Witmer & Ridgely, ).…”

Section: Introductionmentioning

confidence: 99%

“…Paratympanic sinuses expand from the tympanic sinus throughout the posterior cranium and mandible with some expansions anteriorly adjacent to portions of the paranasal sinuses (Tahara & Larsson, ). The paranasal sinus system is composed of a series of divergent branches that remain distinct and extend through both soft tissues and bones (e.g., Tahara & Larsson, ; Witmer, ; Witmer & Ridgely, ). However, major portions of the paratympanic sinuses form complex reticulated air spaces generally throughout posterior cranial and mandibular bones (e.g., Tahara & Larsson, ; Witmer & Ridgely, ; Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…The paranasal sinus system is composed of a series of divergent branches that remain distinct and extend through both soft tissues and bones (e.g., Tahara & Larsson, ; Witmer, ; Witmer & Ridgely, ). However, major portions of the paratympanic sinuses form complex reticulated air spaces generally throughout posterior cranial and mandibular bones (e.g., Tahara & Larsson, ; Witmer & Ridgely, ; Figure ). This highly reticulated paratympanic sinuses in adult birds make it difficult to identify homologies within and across species and also with potential ancestral pneumatic structures identified in the fossil record.…”

Section: Introductionmentioning

confidence: 99%

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Development of the paratympanic pneumatic system of Japanese quail

Tahara

Larsson

2019

Journal of Morphology

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Avian heads are characterized as having two extensive air‐filled systems lined with epithelia; the paranasal and paratympanic sinuses. Many diverticula derived from the paratympanic sinus system are known to reticulate with each other to form a single merged pneumatic space within the adult braincase. However, the development of these complex branching and reticulating epithelia has not been examined in detail. In this study, we describe the comprehensive developmental pattern of the paratympanic sinus and its associated soft tissues in a model bird, Japanese quail (Coturnix japonica). The data are derived from three‐dimensional reconstructions based on histological sections and soft tissue enhanced micro‐CT data. Those data provide the foundation of the complex hierarchical developmental pattern of the paratympanic sinus system. Moreover, associations with other tissues help establish key morphologies that identify each pneumatic entity. This study clarifies the developmental relationships of the ventral portions of the paratympanic sinus system, the siphoneal diverticulum and marginal sinus, based on the ligaments associated with the Eustachian tube. In addition, detailed histological pneumatic morphologies reveal hitherto unknown epithelial diversity, which may be indicative of equally complex developmental processes. We use the pneumatization of the quadrate as an example to support a close relationship with vascular growth and pneumatic epithelia invasion into ossified bone. We confirm pneumatic diverticula never enter into cartilages, possibly due to the absence of vasculature in these tissues. Lastly, we use the concept of a morphogenetic tree as a tool to help present the complex developmental pattern of the paratympanic sinus system and apply it toward inferring pneumatic morphologies in a nonavian theropod braincase.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of the paratympanic pneumatic system of Japanese quail

Tahara

Larsson

2019

Journal of Morphology

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Paranasal sinus system and upper respiratory tract evolution in Mesozoic pelagic crocodylomorphs

Cowgill

Young

Schwab

et al. 2021

The Anatomical Record

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Thalattosuchians were a predominately marine clade of Mesozoic crocodylomorphs, including semi‐aquatic teleosauroid and obligately pelagic metriorhynchid subclades. Recent advances in our understanding of thalattosuchian endocranial anatomy have revealed new details of the evolutionary transition from terrestrial to marine to pelagic taxa. Paranasal sinuses, however, have received little attention. Herein, we investigate the evolution of the paranasal sinus system and part of the upper respiratory system (nasopharyngeal ducts) in Thalattosuchia, by reconstructing the nasal and paranasal anatomy in CT scans of seven thalattosuchian skulls: one teleosauroid, two basal metriorhynchoids and four metriorhynchids. Our outgroups were: three extant crocodylian species (including adult and subadult skulls) and the basal crocodyliform Protosuchus. We found thalattosuchians exhibit exceptionally reduced paranasal sinus systems, solely comprising the antorbital sinus, as has been previously proposed. The semi‐aquatic basal thalattosuchians Palgiopthalmosuchus gracilirostris and Pelagosaurus typus both have an antorbital sinus partially located medial to a reduced external antorbital fenestra and broadly communicating with the dorsal alveolar canal. In pelagic metriorhynchids, the antorbital cavity is more extensive than in basal taxa and possibly had an active function associated with a hypothesized accessory suborbital diverticulum, but our reconstructions are insufficient to confirm or reject the presence of such a diverticulum. The nasopharyngeal ducts of metriorhynchids are dorsoventrally enlarged, possibly enabling stronger ventilation. The sequence of acquisition of craniofacial adaptations show a mosaic pattern and appears to predate many skeletal adaptations, suggesting these changes occurred early in the thalattosuchian marine transition.

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Paratympanic sinuses in juvenile Alligator

Tahara

Larsson

2022

The Anatomical Record

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Crocodylia has an extensive epithelial pneumatic space in the middle ear, paratympanic sinus system. Although fossil and extant crocodylian paratympanic sinus systems have been studied recently using the computed tomography (CT) and three‐dimensional (3D) reconstruction data, due to the soft tissue nature of the pneumatic system and presence of its surrounding soft tissue structures, some boundaries, and definitions of each extension remain ambiguous. We describe the comprehensive paratympanic sinus system in posthatched alligator using soft tissue enhanced CT data with 3D reconstructions. The data are compared to the available data to discuss the ontogenetic pattern in alligator. We introduce further divided entities of the pneumatic system based on their associated bony and soft tissue structures and epithelial membrane and clarify the pneumatic terminologies. We then re‐visit the potential homology of the paratympanic sinus in Archosauria. Epithelial boundaries of the ventral portion of the pneumatic system from the histological data suggest that the dual origin of the basioccipital diverticulum derived from the tympanic sinus and basicranial diverticulum medially. The presence of the epithelial boundary and pneumatic changes in ontogeny suggests that the middle ear may function differently in developmental stages. Lastly, a morphogenetic tree is constructed to help future work of comparative developmental studies of the paratympanic sinus system between crocodiles and birds.

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Head pneumatic sinuses in Japanese quail and zebra finch

Cited by 7 publications

References 81 publications

Development of the paratympanic pneumatic system of Japanese quail

Development of the paratympanic pneumatic system of Japanese quail

Paranasal sinus system and upper respiratory tract evolution in Mesozoic pelagic crocodylomorphs

Paratympanic sinuses in juvenile Alligator

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