31muscle2 - Lecture 31: Joints and Homeostasis Chapter 11:...

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Lecture 31: Joints and Homeostasis Chapter 11: Skeletal System Chapter 12: Muscular System
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The Big Picture Examine the interconnectedness of the skeletal and muscular systems Joints and Movement Homeostasis
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Joints Bones are connected to each other at joints ( articulations ) with ligaments The skeleton is also connected to the muscular system at joints with tendons
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3 Types of Joints Every joint in the body can be classified into one of the following categories: 1.) Fibrous Joints 2.) Cartilaginous Joints 3.) Synovial Joints
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Fibrous Joints Most fibrous joints are completely immovable E.g. sutures between cranial bones
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Cartilaginous Joints Most cartilaginous joints are locations of hyaline or fibrocartilage and are slightly movable E.g. between ribs and sternum, disks between vertebrae
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Synovial Joints Much greater freedom of movement and are what most people typically think of as joints E.g. knees, ankles, wrists, shoulders, etc
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Anatomy of Synovial Joints Ligaments of bones form capsule around joint Filled with synovial fluid to lubricate Fluid-filled bursa sacs cushion bones Hyaline cartilage and meniscus absorb shock
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2 Types of Synovial Joints Consider two types of freely moving synovial joints: Ball-and-socket joints Hinge joints
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Ball-and-Socket Joints Hips and shoulders Allow movement in nearly every direction Rotation, circumduction, ab/adduction
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Hinge Joints Elbows and knees Movement in one plane or direction only Flexion, extension
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31muscle2 - Lecture 31: Joints and Homeostasis Chapter 11:...

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