関連する実験動画
Updated: May 3, 2026
08:02
Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
Published on: May 7, 2016
9.4K
ティカタリック・ローゼアエの頭蓋骨内骨格
Jason P Downs1, Edward B Daeschler, Farish A Jenkins
1Academy of Natural Sciences of Philadelphia, 1900 Benjamin Franklin Parkway, Philadelphia, Pennsylvania 19103, USA. downs@ansp.org
Nature
|October 17, 2008
まとめ
この研究では,テトラポッドに密接に関連した魚であるTiktaalik roseaeの頭蓋骨内骨格について詳細に説明しています. その特徴は,魚からテトラポッドへの移行中の骨格の変化の配列を明らかにし,頭部の移動性と陸上の脊椎動物の起源に影響を与えます.
科学分野:
- パレオントロジー・パレオントロジー
- 進化生物学の進化生物学について
- 比較解剖学 比較解剖学とは
背景:
- "魚からテトラポッド"への移行は,大きな頭蓋骨内骨格の再編成を伴う.
- この移行期における骨格の特徴の獲得の正確な順序は,化石記録から明らかになっていない.
研究 の 目的:
- Tiktaalik roseae.ae.の脳蓋,小口四角形,枝状骨格について説明する.
- 魚からテトラポッドへの移行中の頭蓋骨の変化の順序を明らかにする.
- 脊椎動物の地表性に対する進化的意味を理解するために.
主な方法:
- Tiktaalik roseae.の頭蓋骨内骨格の詳細な形態学的分析が行われました.
- 原始的な魚と初期の四足類との比較分析.
- キャラクター獲得シーケンスの再構築.
主要な成果:
- Tiktaalik roseaeは,原始的な特徴と派生的な特徴の両方を持つ頭蓋骨内骨格を示しています.
- 派生した特徴には,大きな基礎関節と平らで水平方向のエントプテリゴイドが含まれる.
- 短くてまっすぐな下のような中間の特徴は,魚と四足類の条件の間のギャップを埋める.
結論:
- Tiktaalik roseaeの頭蓋骨の形態は,脊椎動物の進化の間に骨格の変化のタイミングに関する重要な洞察を提供します.
- これらの改変は,陸上の生命への移行に不可欠な頭部移動と頭蓋内運動の変化を示唆しています.
- この発見は,脊椎動物の陸生性の進化的起源を理解するのに寄与する.
さらに関連する動画
12:32Image Rendering Techniques in Postmortem Computed Tomography: Evaluation of Biological Health and Profile in Stranded Cetaceans
Published on: September 27, 2020
9.3K
07:26Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
Published on: August 22, 2022
1.7K
関連する概念動画
02:56The Fossil Record
23.0K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
23.0K
01:26Bone Markings
8.8K
Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
8.8K
01:27Compact Bone
22.4K
Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
22.4K
01:27Cranial Bones: Lateral View
6.8K
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...
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...
6.8K
01:19Bones of the Upper Limb: Humerus
11.3K
The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
11.3K
01:10Bones of the Lower Limb: Tibia and Fibula
14.7K
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...
14.7K