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Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
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Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Structural Classification of Joints01:20

Structural Classification of Joints

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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
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Joints01:26

Joints

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Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...
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Accessory Structures of the Skin: Hair Growth and Types01:20

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Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
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Crecimiento de Estructuras y Mediciones de H0 a partir de Lentes de CMB Combinados de ACT, SPT y Planck

Frank J Qu1,2,3, Fei Ge1,2,4,5, W L Kimmy Wu1,5,6

  • 1Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, California 94305, USA.

Physical review letters
|January 30, 2026
PubMed
Resumen

Logramos las mediciones de lentes de fondo cósmico de microondas (CMB) más precisas hasta la fecha, lo que limita el crecimiento de la estructura y la constante de Hubble. Estos hallazgos se alinean con el modelo estándar ΛCDM, ofreciendo información sobre la masa de neutrinos.

Palabras clave:
lentes de CMBcrecimiento de estructurasconstante de Hubblemodelo ΛCDMmasa de neutrinosACTSPTPlanck

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Área de la Ciencia:

  • Cosmología
  • Astrofísica
  • Física de Partículas

Sus antecedentes:

  • Las lentes del Fondo Cósmico de Microondas (CMB) proporcionan una potente sonda del crecimiento de la estructura a gran escala en el Universo.
  • Las mediciones anteriores han enfrentado limitaciones en precisión, lo que requiere análisis combinados de múltiples conjuntos de datos.
  • Comprender el crecimiento de la estructura es crucial para probar modelos cosmológicos como ΛCDM.

Objetivo del estudio:

  • Derivar las restricciones más estrictas sobre el crecimiento de la estructura utilizando datos combinados de lentes de CMB.
  • Medir parámetros cosmológicos clave, incluida la amplitud de las fluctuaciones de materia (S8) y la constante de Hubble (H0).
  • Probar la consistencia de estas mediciones con el modelo estándar ΛCDM e investigar las implicaciones para la masa de neutrinos.

Principales métodos:

  • Mediciones combinadas de lentes de CMB del Atacama Cosmology Telescope (ACT), South Pole Telescope (SPT) y Planck.
  • Análisis de las potencias de banda de lentes conjuntas para obtener la medición más precisa del espectro de potencia de lentes de CMB.
  • Incorporación de datos de Oscilación de Bariones Acústicos (BAO) y supernovas no calibradas (Pantheon+) para mejorar las restricciones de parámetros.

Principales resultados:

  • Se logró una relación señal/ruido combinada de lentes de 61, lo que arrojó una medición precisa de A_{lens}^{recon}=1.025±0.017.
  • Se obtuvo una medición del 1.6% de S_{8}^{CMBL} = 0.825 ± 0.015, mejorando al 1.1% (σ8 = 0.829 ± 0.009) con datos de BAO.
  • Se presentó una estimación independiente del horizonte sonoro del 4% de H0 = 66.4 ± 2.5 km/s/Mpc y se impulsaron los límites superiores de la masa de neutrinos hacia valores más bajos.

Conclusiones:

  • Las restricciones combinadas de lentes de CMB son consistentes con el modelo ΛCDM, como lo respaldan los datos primarios de CMB de Planck y ACT.
  • El análisis combinado proporciona restricciones estrictas sobre los parámetros cosmológicos, mejorando nuestra comprensión de la evolución del Universo.
  • El estudio demuestra el poder de combinar múltiples sondas cosmológicas para una estimación precisa de parámetros y pruebas de modelos.