A joint is an articulation between two bones in the body and are broadly classified by the tissue which connects the bones. The three main types of joints are: synovial, cartilaginous and fibrous.
Bones of lower limb (Human Anatomy)
by DR RAI M. AMMAR
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A joint is an articulation between two bones in the body and are broadly classified by the tissue which connects the bones. The three main types of joints are: synovial, cartilaginous and fibrous.
Bones of lower limb (Human Anatomy)
by DR RAI M. AMMAR
www.facebook.com/drraiammar
www.twitter.com/drraiammar
www.instagram.com/drraiammar
www.linkedin.com/in/drraiammar
www.themedicall.com/blog/auther/drraiammar/
For Any Book or Notes Visit Our Website:
www.allmedicaldata.wordpress.com
www.drraiammar.blogspot.com
YOUTUBE CHANNEL :
https://www.youtube.com/channel/UCu-oR9V3OdFNTJW5yqXWXxA
ANY QUESTION ??
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drraiammar@gmail.com
allmedicaldata@gmail.com
At the completion of this unit, learners will be able to: 1. Define the term joint. 2. List three types of joints I.e. Fibrous Cartilaginous Synovial 3. Describe the common characteristic features of a synovial joint. 4. List the types of synovial joints. 5. Discuss the types of movements possible at synovial joints.
Joints, function and types of joints.pptx10khan113ii
Joints, or articulations, are the structures where two or more bones meet, allowing for movement and providing mechanical support. They are essential for a wide range of motions and functions in the human body. Here's a detailed description of joints:
### Types of Joints Based on Structure:
1. **Fibrous Joints**:
- **Description**: Connected by dense connective tissue rich in collagen.
- **Movement**: Generally immovable (synarthrotic).
- **Examples**: Sutures in the skull, syndesmoses between long bones like the tibia and fibula.
2. **Cartilaginous Joints**:
- **Description**: Bones connected entirely by cartilage (either hyaline or fibrocartilage).
- **Movement**: Allow limited movement (amphiarthrotic).
- **Examples**: Intervertebral discs, pubic symphysis.
3. **Synovial Joints**:
- **Description**: Characterized by a fluid-filled synovial cavity that separates the articulating bones.
- **Movement**: Freely movable (diarthrotic), with various degrees and types of movement depending on the specific joint type.
- **Examples and Subtypes**:
- **Hinge Joints**: Permit flexion and extension (e.g., elbow, knee).
- **Ball-and-Socket Joints**: Allow rotational movement and a wide range of motion (e.g., shoulder, hip).
- **Pivot Joints**: Enable rotational movement around a single axis (e.g., atlantoaxial joint in the neck).
- **Gliding Joints**: Allow sliding or gliding movements (e.g., intercarpal joints in the wrist).
- **Saddle Joints**: Permit movement along two planes (e.g., thumb joint).
- **Condyloid Joints**: Allow movement but no rotation (e.g., wrist joint between the radius and carpal bones).
### Types of Joints Based on Function:
1. **Synarthroses**:
- **Description**: Immovable joints providing strong, stable connections.
- **Examples**: Skull sutures.
2. **Amphiarthroses**:
- **Description**: Slightly movable joints.
- **Examples**: Intervertebral discs, pubic symphysis.
3. **Diarthroses**:
- **Description**: Freely movable joints, synonymous with synovial joints.
- **Examples**: Most limb joints like the knee, hip, shoulder.
### Joint Anatomy:
- **Cartilage**: Covers the ends of bones, providing a smooth surface for movement and cushioning.
- **Synovial Membrane**: Lines the joint capsule and secretes synovial fluid for lubrication.
- **Ligaments**: Strong bands of connective tissue that connect bones and stabilize the joint.
- **Tendons**: Connect muscle to bone, aiding in joint movement.
- **Bursae**: Fluid-filled sacs that reduce friction between moving structures within the joint.
### Functions of Joints:
- **Movement**: Facilitate a range of bodily movements, from gross motor functions like walking and lifting to fine motor skills like writing and typing.
- **Support**: Maintain the body's structure and posture.
- **Protection**: Protect internal structures by providing cushioning and absorbing impact.
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