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    You are at:Home»Anatomy»Types Of Joints – Classification of Joints in the Human Body
    Classification of Joints in the Human Body

    Types Of Joints – Classification of Joints in the Human Body

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    By krunoslav on April 19, 2020 Anatomy
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    Classification of Joints in the Human Body

    A joint is the point of juncture between two bones. It is usually formed of fibrous connective tissue and cartilage. If the bones of the skeleton were fused together in solid joints it would have no flexibility. Instead, where one bone meets another, we have joints. Joints, therefore, allow the skeleton to move. In this article, we shall look at the classification of joints in the human body.

    There are various types of joints that give different amounts of flexibility and therefore, different amounts of movement.

    There are two ways to classify joints: on the basis of their structure (i.e., the type of soft tissue that connects the bones to each other) or on the basis of their function (i.e., the degree of movement that they allow). We strongly believe that all strength trainees should master the basics of human anatomy. Learning basic anatomy for strength training can enhance your results and give you the advantage to develop effective training programs.

    I. Classification of joints regarding their mobility

    There are three main types of joints with respect to their ability to move (classification by degree of movement):

    A. Immovable joints (Synarthrosis)

    Immovable joints allow no movement because the bones at these joints are held securely together by dense collagen. The bones of the skull are connected by immovable joints.

    immovable joints: joints that connect bones of the skull (excluding the jaw bone)
    immovable joints: joints that connect bones of the skull (excluding the jaw bone)

    B. Partly movable joints (Amphiarthrosis)

    Slightly movable joints allow only very limited movement. Bones at these joints are held in place by cartilage. The ribs and sternum are connected by partly movable joints.

    slightly movable joints
    The ribs connected to the sternum by costal cartilages are slightly movable joints connected by hyaline cartilage

    C. Movable joints (Diarthrosis)

    Movable joints allow the most movement. Bones at these joints are connected by ligaments. Movable joints are the most common type of joints in the body, so they are described in more detail next.

    movable joints diarthrosis
    Example: shoulder and hip joints. The bones in these joints fit together with a spherical bone sitting inside another bone that has a concave depression (so called “ball and socket joint”)

    II. Classification of joints by type of tissue

    Structural classification of joints is based upon the material (type of tissue) connecting the bones.

    A. Fibrous Joints

    Fibrous joints lack a joint cavity and the articulating bones are held very closely by fibrous connective tissue. In other words, a fibrous joint is where the bones are bound by a tough, fibrous tissue. It is obvious they permit little or no movement. These are typically joints that require strength. The three types of fibrous joints are:

    1. Sutures (example: skull)
    2. Syndesmoses (example: radius and ulna)
    3. Gomphonses (example: tooth and jaw)
    Fibrous joints: skull, radius and ulna, tooth and jaw
    Fibrous joints: skull, radius and ulna, tooth and jaw

    B. Cartilaginous Joints

    This is another joint that has no cavity. In a cartilaginous joint the articulating bones are connected (united) by cartilage, and allow little or no movement.

    There are two kinds of cartilaginous joints:

    1. Synchondroses (example: growth plates in long bones)
    2. Symphyses (example: intervertebral disks)
    Cartilaginous joints: epiphyseal cartilage, intervertebral disc, pubic symphysis
    Cartilaginous joints: epiphyseal cartilage, intervertebral disc, pubic symphysis

    C. Synovial Joints

    A Synovial joint is one in which there is a space between articulating bones. The space or the cavity is also called the synovial cavity. They are characterized by the presence of articular cartilage. The articular surfaces of synovial joints are kept in contact with each other by several factors; one is the fit of the articulating bones; another factor is the strength of the joint ligaments; which is especially important in the hip joint. The significance of the synovial joint is that when required the joint secretes a liquid that lubricates the joint, allowing for the smooth gliding to occur. They are the most common type of joint you can find in the body. The synovial fluid serves two fundamental functions:

    1. Mechanical Function – the fluid lubricates the articular surfaces, allowing for action while preventing excessive wear
    2. Physiologic Function – the fluid seeps into the articular cartilage and nourishes the cartilage cells

    Synovial Joint Classifications

    Synovial joint classifications
    Synovial joint classifications
    1. Saddle joint. In a saddle joint, the articular surfaces of both bones are saddle-shaped, concave in one direction and convex in the other direction. The movements are side to side and back and forth. The joint between the trapezium and metacarpal of the thumb is an example of a saddle joint.
    2. Hinge joint. In this joint, the convex surface of one bone fits into the concave surface of the other bone. Movement is usually flexion and extension. Some examples are the knee, elbow and ankle.
    3. Pivot joint. This is where a rounded, pointed or conical surface of one bone articulates within a ring formed partly by bone and partly by ligament. Movement is by supination and pronation. Example: rotation of the head from side to side.
    4. Ball and Socket joint. The ball-like surface of one bone fits into a cuplike depression of another bone. Examples are the hip or shoulder joint.
    5. Gilding Joint. Also called arthrodia, these are usually flat. There is only side to side or back and forth movement. Examples include: carpal bones, tarsal bones, sternum, clavicle, and scapula.
    6. Ellipsoid joint. This is where an oval-shaped condyle of one bone fits into an elliptical cavity of another bone. It is a modified ball and socket joint, whose function is to flex and extend, and adduct and abduct. One example is the Radiocarpal joint.

    Summing up: Classification of joints in the human body

    At a joint, two bones meet and in most cases they move against each other.

    There are two main classifications of joints in the human skeleton. We can classify them either by the type of the tissue present (fibrous, cartilaginous or synovial), or by the degree of movement they permit (synarthrosis, amphiarthrosis or diarthrosis).

    There are a number of very different types of joints. In some, like those in our skull and pelvis, the bones are fused together and allow little or no movement. Some, like the joints in our fingers, knees and elbows, are known as hinge joints because they work like a hinge – they allow an opening and closing movement. Yet other joints, like our shoulders and hips, allow very free movement. There is a “ball” of bone on the end of one bone in the joint, and a smooth socket on the other bone in the joint into which it fits. This gives lots of free rotational movement and these joints are known as ball and socket joints.

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    Hey! My name is Petar, and I'm the owner and author of Bodybuilding Wizard. I started this website back in late 2014, and it has been my pet project ever since. My goal is to help you learn proper weight training and nutrition principles so that you can get strong and build the physique of your dreams!

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