捕捉和推进的结合:Ardipithecus ramidus的脚
C Owen Lovejoy1, Bruce Latimer, Gen Suwa
1Department of Anthropology, School of Biomedical Sciences, Kent State University, Kent, OH 44240, USA.
概括
阿迪皮塞克斯 (Ardipithecus ramidus) 的脚表现出独特的步态,与现代人猿和人类截然不同. 它的原始特征表明,它是一个小心翼翼的登祖先,适应了树木生活.
科学领域:
- 古人类学古人类学.
- 灵长类动物解剖学 灵长类动物解剖学
- 进化生物学 进化生物学
背景情况:
- 化石Ardipithecus ramidus (ARA-VP-6/500) 提供了对早期人类足部解剖学的关键见解.
- 了解脚的结构是重建Ardipithecus的运动和进化关系的关键.
研究的目的:
- 为了分析Ardipithecus ramidus脚的解剖特征.
- 将这些特征与现存的灵长类动物和灭绝的猿类动物进行比较,以推断运动能力.
- 了解Ardipithecus的步态模式和爬适应性.
主要方法:
- 从Ardipithecus ramidus保存的脚部元素的形态分析.
- 与现存的非洲猿,旧世界猿和米奥森猿的骨数据进行比较分析.
- 功能解释肌肉动作和关节机制.
主要成果:
- 阿迪皮塞克斯的脚具有广泛的吸收性,在陆地双脚动物中不用于推进.
- 它缺乏在现存的非洲猿类中看到的垂直爬的衍生塔尔索米塔萨斯松性.
- 原始的字符提供足部刚性,而长体肌肉的运动类似于旧世界子,其长与大猩猩相似.
结论:
- 阿迪皮塞克斯拉米杜斯 (Ardipithecus ramidus) 呈现出独特的步态模式,与现代人类和现存的猿人不同.
- 脚的形态表明适应了谨慎登和上方的树枝植被.
- 人类类和黑猩猩的最后一个共同祖先很可能是一个熟练的登者,保留了原始的特征.
相关概念视频
Muscles of the Leg that Move the Foot and Toes
The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles.
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles.
Bones of the Lower Limb: Tibia and Fibula
The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...
Ankle Joint
The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
Surface Appendages of Archaea
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Convergent Evolution
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...

