Video Experimental Relacionado
Updated: Jul 11, 2026
08:15
Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
Published on: January 7, 2019
La muñeca primitiva del Homo floresiensis y sus implicaciones para la evolución de los homínidos
Matthew W Tocheri1, Caley M Orr, Susan G Larson
1Human Origins Program, Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA. tocherim@si.edu
Science (New York, N.Y.)
|September 22, 2007
Resumen
El análisis del hueso de la muñeca de Homo floresiensis sugiere que se trata de una especie distinta. La morfología primitiva de la muñeca indica un ancestro homínido temprano, no un humano moderno patológico.
Área de la Ciencia:
- La paleoantropología es la paleoantropología.
- Evolución del ser humano Evolución del ser humano
- Anatomía de los Primates La anatomía de los primates
Sus antecedentes:
- La clasificación del Homo floresiensis, descubierto en la isla de Flores, Indonesia, sigue siendo polémico.
- El debate se centra en si los fósiles representan una nueva especie de homínidos o humanos modernos que exhiben patología.
Objetivo del estudio:
- Para investigar la posición filogenética del Homo floresiensis.
- Para determinar si la morfología de la muñeca de LB1 es consistente con una especie distinta o con un humano moderno patológico.
Principales métodos:
- Análisis comparativo de la morfología ósea de la muñeca.
- Examen del espécimen del holotipo (LB1) de Homo floresiensis. fue realizado.
- Comparación con la morfología de la muñeca de los neandertales, los humanos modernos y los homínidos ancestrales.
Principales resultados:
- Los huesos de la muñeca de LB1 exhiben una morfología primitiva, ancestral del clado simio-humano africano.
- Los neandertales y los humanos modernos comparten una morfología derivada de la muñeca, desarrollada durante la embriogénesis.
- Es poco probable que el estado primitivo de la muñeca en LB1 sea el resultado de patología o defectos de desarrollo.
Conclusiones:
- El Homo floresiensis no es un humano moderno patológico.
- La morfología única de la muñeca apoya al Homo floresiensis como una especie distinta.
- Esta especie probablemente divergió de un antepasado homínido anterior al antepasado común de los humanos modernos y los neandertales.
Videos de Conceptos Relacionados
01:09Changes in the Appendicular Skeleton with Age
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
01:15Bones of the Upper Limb: Ulna
The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
01:16Muscles of the Forearm that Move the Hand and Fingers
The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
01:09Bones of the Upper Limb: Radius
The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...
The radius has a nail-shaped head, and a short...
01:19Bones of the Upper Limb: Humerus
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...
02:56The Fossil Record
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...