The comparative and functional anatomy of the forelimb muscle architecture of Humboldt's woolly monkey (Lagothrix lagotricha)

IF 1.8 4区 医学 Q2 ANATOMY & MORPHOLOGY
Andrew S. Deane, Magdalena N. Muchlinski, Jason M. Organ, Evie Vereecke, Vanya Bistrekova, Lindsey Hays, Timothy Butterfield
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Abstract

Humboldt's woolly monkey (Lagothrix lagortricha) is a ceboid primate that more frequently engages in plantigrade quadrupedalism (~89%) but is, like most other members of the subfamily Atelinae, capable of suspensory postures and “tail assisted” brachiation. That taxon's decreased reliance on suspension is reflected in the skeletal anatomy of the upper limb which is less derived relative to more frequently suspensory atelines (Ateles, Brachyteles) but is in many ways (i.e., phalangeal curvature, enlarged joint surfaces, elongated diaphyses) intermediate between highly suspensory and quadrupedal anthropoids. Although it has been suggested that muscle may have morphogenetic primacy with respect to bone this has not been explicitly tested. The present study employs analyses of Lagothrix upper limb muscle fiber length, relative physiological cross-sectional area and relative muscle mass to test whether muscular adaptations for suspensory postures and locomotion in Lagothrix precede adaptive refinements in the skeletal tissues or appear more gradually in conjunction with related skeletal adaptations. Results demonstrate that Lagothrix upper limb musculature is most like committed quadrupeds but that limited aspects of the relative distribution of segmental muscle mass may approach suspensory hylobatids consistent with only a limited adaptive response in musculature prior to bone. Results specific to the shoulder were inconclusive owing to under-representation of quadrupedal shoulder musculature and future work should be focused more specifically on the adaptive and functional morphology of the muscular anatomy and microstructure of the scapulothoracic joint complex.

Abstract Image

洪堡毛猴(Lagothrix lagotricha)前肢肌肉结构的比较和功能解剖。
洪堡毛猴(Lagothrix lagortricha)是一种偃卧类灵长类动物,较多采用四足行走(约占89%),但与阿特灵亚科的大多数其他成员一样,也能采用悬挂姿势和 "尾部辅助 "腕动。该类群对悬挂的依赖程度较低,这反映在上肢的骨骼解剖结构上,相对于更常见的悬挂类动物(Ateles、Brachyteles),该类群的上肢较少衍生,但在许多方面(即指骨弯曲、关节面增大、骨骺拉长)介于高度悬挂类动物和四足类动物之间。尽管有人认为肌肉可能在形态发生上优先于骨骼,但这一观点尚未得到明确验证。本研究通过分析 Lagothrix 上肢肌肉纤维长度、相对生理横截面积和相对肌肉质量,来检验 Lagothrix 肌肉对悬挂姿势和运动的适应是否先于骨骼组织的适应性改进,还是与相关骨骼适应性一起逐渐出现。结果表明,Lagothrix 的上肢肌肉组织最像四足动物,但节段肌肉质量的相对分布的有限方面可能接近悬挂基质,这与骨骼之前肌肉组织的有限适应性反应一致。由于四足动物肩部肌肉组织的代表性不足,肩部的具体结果尚无定论,今后的工作应更具体地侧重于肩胛胸关节复合体肌肉解剖和微结构的适应性和功能性形态。
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来源期刊
CiteScore
4.80
自引率
15.00%
发文量
266
审稿时长
4 months
期刊介绍: The Anatomical Record
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