The cranio-mandibular complex of the nightjar Systellura longirostris (Ayes, Caprimulgiformes): functional relationship between osteology, myology and updates tor feeding
The cranio-mandibular complex of the nightjar Systellura longirostris (Ayes, Caprimulgiformes): functional relationship between osteology, myology and updates tor feeding
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DOI：
10.1016/j.zool.2018.11.001
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发表时间：
2019-02-01
期刊：
影响因子：
2
通讯作者：
Alfredo Tirao, German
中科院分区：
文献类型：
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作者：
Demmel Ferreira, Maria M.;Patricia Tambussi, Claudia;Alfredo Tirao, German
在这里，我们解决的头部肌肉骨骼的形态学在南美洲带翅夜鹰（Systemlura longirostris，Caprimulgiformes，Ayes）的重点是如何在嘴关闭和开放的机制。骨特征，如眶间隔的薄和眶后突的减少共同协助大眼睛的位置，虽然眼睛大小脑质量和身体质量之间的相关性显示，带翅夜鹰的眼睛比预期的要大。方骨眶突的复位将允许较大的上颌前牵引提供较大的张口度。长喙统表现为下颌内屈肌萎缩，骨化明显减少，有助于颌骨的侧向张开。在Systemellura longirostris中，它们。假颞深肌下颌外收肌、浅肌;下颌外收肌内侧缺失。内收肌占下颌肌总质量的66.614%。内收肌的生理横截面积（PCSA）值很高，与其他食肉鸟类相比，纤维相对较长，这是另一种有利于内收的条件。分枝下颌深外收肌是其质量最大的颌肌，但其在脑颅、颞窝上的骨学相关性缺失。在没有负责合嘴的肌肉的情况下，提出了一个合嘴的弹性失稳模型。
Here we address the morphology of the cranial musculoskeletal in the South American Band-winged nightjar (Systellura longirostris, Caprimulgiformes, Ayes) with the focus upon in how the mouth closure and opening mechanism is. Bony characters such as the thinness of the interorbital septum and the reduction of the postorbital process co-assist the location of large eyes, although correlations between eye size brain mass and body mass revealed that the Band-winged nightjar's eye is bigger than expected. The reduction of the processus orbitalis of the os quadratum would allow the great mouth opening given by a large maxillary protraction. Systellura longirostris shows a zona flexoria intramandibularis with marked reduction in bone ossification that helps to the lateral opening of the jaws. In Systellura longirostris, them. pseudotemporalis profundus, m. adductor mandibulae externus superficialis, and m. adductor mandibulae externus medialis are absent. The adductor muscles represent 66.614% of the total mandibular muscle mass. Physiological Cross Sectional Area (PCSA) values of the adductor muscles are high and the fibers are relatively long compared to other zoophagous birds, another condition that favors adduction. The m. adductor mandibulae externus profundus is the largest jaw muscle regarding its mass but its osteological correlate on the neurocranium, the fossa temporalis, is absent. In the absence of some muscles in charge of the bill closing, an elastic instability model for jaw closing is proposed.