Name: how limb joints form in the embryo
Uploaded: 2023-06-23T15:38:52.000Z
Duration: 1 min 7 s
Channel: JoVE

K12 Standards

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

9-12

Human Anatomy and Physiology

Support And Motion

Skeletal System

Development of the Limb Synovial Joints

Joint development begins during the embryonic stage and occurs alongside bone formation.
The development of synovial joints in the limbs start from the limb buds, which develop from the mesenchyme and appear on each side of the embryo after four weeks.
During the sixth week, the limb buds elongate, where the mesenchyme develops into hyaline cartilage and forms the cartilaginous model of the bone.
The region between adjacent cartilaginous models is called the joint interzone. At the center of the joint interzone, the death of mesenchymal cells results in the formation of the joint cavity, where the synovial joints develop.
Mesenchymal cells surrounding the joint interzone form the articular capsule and the supporting ligaments.
Around the twelfth week, the cartilaginous model transforms into the bone in a process called endochondral ossification.
At birth, ossification is complete, and by eight weeks, the synovial joints of an infant resemble those of an adult.

development of the limb synovial joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs initially develop as small limb buds that appear on the sides of the embryo around the end of the fourth week. Starting during the sixth week, as each limb bud continues to grow and elongate, areas of mesenchyme within the bud begin to differentiate into the hyaline cartilage that will form models for each of the future bones. The synovial joints will form between the adjacent cartilage models, in an area called the joint interzone. Cells at the center of this interzone region undergo cell death to form the joint cavity, while surrounding mesenchymal cells will form the articular capsule and supporting ligaments. The process of endochondral ossification, which converts the cartilage models into bone, begins by the twelfth week of embryonic development. At birth, ossification of much of the bone has occurred, but the hyaline cartilage of the epiphyseal plate will remain throughout childhood and adolescence to allow for bone lengthening. Hyaline cartilage is also retained as the articular cartilage that covers the surfaces of the bones at synovial joints.
This text is partially adapted from <a href="https://openstax.org/books/anatomy-and-physiology-2e/pages/9-7-development-of-joints">Openstax, Anatomy and Physiology 2e, Section 9.7: Development of Joints</a>

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all ...

Education

JoVE Core

Anatomy and Physiology

Unit 1

The Joints

KEY TERMS AND CONCEPTS

how limb joints form in the embryo

Limb synovial joints form during embryonic development as the bones of the arms and legs begin to take shape. The process starts with mesenchyme, the embryonic tissue that gives rise to bones, cartilage, and connective tissues. Mesenchymal stem cells first become chondrocytes, which make hyaline cartilage. This cartilage later becomes the model for each bone and then turns into bone through endochondral ossification.

The limbs first appear as small limb buds on the sides of the embryo near the end of the fourth week. By the sixth week, these buds continue to grow and elongate. Areas of mesenchyme inside the limb buds then begin forming the hyaline cartilage models of the future bones. Synovial joints develop between neighboring cartilage models in a region called the joint interzone.

Cells in the center of the joint interzone die to create the joint cavity. The mesenchymal cells around this space form the articular capsule and the supporting ligaments. Endochondral ossification, which changes the cartilage models into bone, begins by the twelfth week of embryonic development.

At birth, much of the bone has already ossified, or become bone tissue. However, hyaline cartilage remains in the epiphyseal plate during childhood and adolescence so bones can keep lengthening. Hyaline cartilage also stays as articular cartilage, the smooth covering on the bone surfaces at synovial joints.

How Limb Joints Form in the Embryo

introduction to joints

Joints: Stability and Movement

Joints are where bones come together in the human body. The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Many joints let bones move smoothly against each other, while other joints are built for support and very little movement. Joint stability and movement are closely linked. Joints that are very stable usually allow little or no mobility. Joints that allow the most movement are the least stable. This...

functional classification of joints

Joint Mobility and Bone Movement

Joint mobility is the basis of the functional classification of joints. Joints are grouped by how much movement they allow between nearby bones. They are classified as synarthrosis, amphiarthrosis, or diarthrosis. A synarthrosis is an immobile or nearly immobile joint. These joints form a strong union between bones. That strength is important where the bones help protect internal organs. Examples include sutures between the bones of the skull, which protect the brain, and the manubriosternal...

structural classification of joints

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Body joints, or articulations, are grouped by how the bones are connected and how much they move. The main structural features are the tissue between the bones and whether a fluid-filled joint cavity is present. These differences divide joints into three structural classes. Fibrous joints connect adjacent bones with fibrous connective tissue. They do not have a synovial cavity. The bones are joined by dense irregular connective tissue rich in collagen fibers, so movement is minimal to none. <br...

structural joints: fibrous joints

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Fibrous joints connect bones with fibrous connective tissue. They give the body stability and allow little to no movement between the bones that meet there. There are three kinds of fibrous joints: sutures, syndesmoses, and gomphoses. A suture joins the bones of the skull, except for the mandible. The strong fibrous tissue at these joints helps protect the brain and shape the face. In adults, the skull bones lie close together, and fibrous tissue fills the narrow space between them. Many...

structural joints: cartilaginous joints

Cartilage Joints in Bones and Growth

Cartilaginous joints are bone connections made with cartilage, a tough but flexible connective tissue. They do not have a joint cavity like synovial joints. Instead, the bones are linked by either hyaline cartilage or fibrocartilage. One type of cartilaginous joint is the synchondrosis, which means bones are joined by hyaline cartilage. A synchondrosis can be temporary or permanent. The temporary form is the epiphyseal, or growth, plate in a growing long bone. This plate is the growing hyaline...

structural joints: synovial joints

Synovial Joints: Mobility and Lubrication

Synovial joints are the body’s most mobile joints. They have a joint cavity, which is a fluid-filled space where the bones meet. Unlike fibrous or cartilaginous joints, the bone surfaces in a synovial joint are not directly joined by fibrous connective tissue or cartilage. This structure lets the bones move smoothly against each other. The walls of the joint cavity are made by the articular capsule, a fibrous connective tissue structure that attaches to each bone just outside the articulating...

articulations of the vertebral column

How Vertebrae and Joints Control Spine Motion

The vertebral column has synovial joints that help control how the spine moves. Adjacent vertebrae connect not only through the intervertebral discs, but also through joints between the superior and inferior articular processes. These joints are called zygapophysial joints, or facet joints, and they are plane joints that allow only limited motion. The direction of the articular processes changes in different regions of the spine. This change affects which movements are possible in each area.

knee joint

Knee Joint Ligaments and Menisci

The knee joint is the most complicated joint in the body. It includes three articulations: two tibiofemoral joints and one patellofemoral joint. As a synovial joint, it has a thin articular capsule that partly surrounds the joint cavity. Several ligaments, muscles, and cartilaginous structures help the knee move and stay stable. Seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris muscle group, is the main ligament that stabilizes the...

ankle joint

Ankle Hinge Motion and Ligaments

The ankle joint is a hinge joint that links the foot and lower leg. It is formed by the talocrural joint, which brings together the talus bone of the foot with the distal ends of the tibia and fibula in the leg. The talus has a square-shaped top surface with three areas of articulation. The upper part of the talus meets the inferior tibia and carries body weight between the leg and foot. The medial malleolus of the tibia and the lateral malleolus of the fibula hold the talus in place on the...

Limb synovial joints form during embryonic development as the bones of the arms and legs begin to take shape. The process starts with mesenchyme, the embryonic tissue that gives rise to bones, cartilage, and connective tissues. Mesenchymal stem cells first become chondrocytes, which make hyaline cartilage. This cartilage later becomes the model for each bone and then turns into bone through endochondral ossification. The limbs first appear as small limb buds on the sides of the embryo near the...

key terms and concepts

Learn how limb synovial joints develop from mesenchyme, cartilage models, and the joint interzone as embryonic bones and ligaments form.

How Limb Joints Form in the Embryo | JoVE K12

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Muscular System

How Limb Joints Form in the Embryo

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