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関連する概念動画

Sutures of the Skull01:22

Sutures of the Skull

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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
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Overview of the Skull01:08

Overview of the Skull

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The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
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Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

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The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
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Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
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アフリカのミオセンの新生児の頭蓋骨が 類人猿の進化に光を当てている

Isaiah Nengo1,2, Paul Tafforeau3, Christopher C Gilbert4,5,6

  • 1Department of Anthropology, De Anza College, Cupertino, California 95104, USA.

Nature
|August 11, 2017
PubMed
まとめ

ケニアの化石猿の頭蓋骨は 初期のヒト類の進化について 洞察力を与えてくれます この発見はミオセンの時代における 類人猿と人間の起源に光を当てています

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Last Updated: Feb 24, 2026

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科学分野:

  • 古人類学
  • 霊長類の進化
  • 化石 の 発見

背景:

  • 人間と類人猿 (ホミノイド) の進化史はよくわかっていない.
  • ミオセンのアフリカの化石記録は主に孤立したと歯で構成されており,猿の頭蓋骨の進化に関する知識は限られている.

研究 の 目的:

  • これまでに発見された最も完全な 猿の頭蓋骨の化石です
  • ケニアの新種の類人猿の 頭蓋骨と歯の特徴を調査するために

主な方法:

  • ケニアのナプデットの1300万年前のミオセンの中期遺跡から発見された化石類人猿の頭蓋骨 (KNM-NP 59050) の発掘と分析.
  • シンクロトロン画像で 永久歯を可視化します
  • 現存するカタリンと化石を比較した形態学的分析.

主要な成果:

  • KNM-NP 59050の発見は,最も完全な化石類人猿の頭蓋骨を表す *Nyanzapithecus*の新しい種です.
  • 標本には完全に骨化した管状の耳膜があり,これは冠状の耳膜に共通する特徴です.
  • 歯の発達と形状はヒロバチドと類似しているが,明確なヒロバチドのシナポモルフィーがない.

結論:

  • ニャンザピテキンは,現存する類人猿の起源と密接に関連している幹型ホミノイドであると考えられています.
  • ハイロバチドに似た特徴は,カタリン進化の中で独立して何度も進化した可能性がある.