Name: synovial joints: mobility and lubrication
Uploaded: 2025-05-22T09:05:58.000Z
Duration: 1 min 16 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

Structural Joints: Synovial Joints

Synovial joints are diarthroses or articluations formed between bones that move freely against each other, such as the joints in the limbs.
Articular cartilage, a type of hyaline cartilage, covers the adjoining bones and reduces friction during joint movement.
The articular or joint capsule is a fibrous connective tissue enclosing the joint. Its dense outer tissue attaches to the periosteum of the articulating bones, whereas the loose inner tissue forms the synovial membrane that produces the synovial fluid.&#160;
The synovial membrane is supplied by a network of blood vessels. These vessels act as a source of blood plasma which is filtered to form the synovial fluid.
The synovial fluid fills the cavity between the articulating bone surfaces and functions as a lubricant and shock absorber. It also helps to distribute nutrients to the surrounding cells.
Bands of thickened fibrous tissue outside the articulating surfaces form the capsular ligaments that strengthen the synovial joint.
The capsule and ligaments contain sensory nerves that monitor the joint movement and sense pain.&#160;&#160;&#160;

structural joints: synovial joints

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 against each other, allowing for increased joint mobility.
The walls of the joint cavity are formed by the articular capsule, a fibrous connective tissue structure attached to each bone just outside the area of the bone&#39;s articulating surface. Friction between the bones at a synovial joint is prevented by the presence of the articular cartilage that covers the entire articulating surface of each bone. Lining the inner surface of the articular capsule is a thin synovial membrane. The cells of this membrane secrete synovial fluid, a thick, slimy fluid that provides lubrication to further reduce friction between the joint&#39;s bones. This fluid also provides nourishment to the articular cartilage, which does not contain blood vessels. The ability of the bones to move smoothly against each other within the joint cavity, and the freedom of joint movement this provides, means that each synovial joint is functionally classified as a diarthrosis.
Outside their articulating surfaces, the bones are connected by ligaments, which are strong bands of fibrous connective tissue. These strengthen and support the joint by anchoring the bones together and preventing their separation. Ligaments allow for normal movements at a joint but limit the range of these motions, thus preventing excessive or abnormal joint movements. At many synovial joints, additional support is provided by the muscles and their tendons that act across the joint. A tendon is a dense connective tissue structure that attaches a muscle to bone. As forces acting on a joint increase, the body will automatically increase the overall strength of contraction of the muscles crossing that joint, thus allowing the muscle and its tendon to serve as a &#34;dynamic ligament&#34; to resist forces and support the joint. This indirect support by muscles is essential at the shoulder joint, for example, where the ligaments are relatively weak.
This text is adapted from <a href="https://openstax.org/books/anatomy-and-physiology-2e/pages/9-4-synovial-joints">Openstax, Anatomy and Physiology 2e, Section 9.4: Synovial Joints</a>

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. ...

Education

JoVE Core

Anatomy and Physiology

Unit 1

The Joints

KEY TERMS AND CONCEPTS

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 surface. The articulating surfaces are covered with articular cartilage, which helps prevent friction.

The inner surface of the articular capsule is lined by the synovial membrane. The cells in this membrane secrete synovial fluid, a thick, slippery fluid that lubricates the joint and lowers friction even more. Synovial fluid also nourishes the articular cartilage, which does not contain blood vessels.

Because these joints allow free movement, each synovial joint is functionally classified as a diarthrosis. Outside the articulating surfaces, ligaments connect the bones. These strong bands of fibrous connective tissue support the joint, hold the bones together, and limit movement enough to prevent excessive or abnormal motion.

Many synovial joints also receive added support from nearby muscles and their tendons. A tendon is dense connective tissue that attaches muscle to bone. When forces on a joint increase, the body increases muscle contraction, and the muscle plus tendon can act like a dynamic ligament to help resist stress. This support is especially important at the shoulder, where the ligaments are relatively weak.

Synovial Joints: Mobility and Lubrication

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

Types of Body Joints by Movement

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

Fibrous Joints in Skull, Teeth, and Limbs

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...

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...

development of the limb synovial joints

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...

key terms and concepts

Learn how synovial joints move smoothly with a joint cavity, articular cartilage, synovial fluid, ligaments, and muscle support for high school anatomy.

Synovial Joints: Mobility and Lubrication | JoVE K12

anatomy and physiology

JoVE Core Anatomy and Physiology showcases the anatomical and physiological details of the human body in comprehensive, clear, and engaging video animations. This collection of lessons focuses on the structures, components, functions, and requirements of the human body. It is complemented by scientist-in-action videos that demonstrate the application of this knowledge in real-world medical and research settings.

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Muscular System

Synovial Joints: Mobility and Lubrication

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