Joints Flashcards
3 types of joints
Synarthrosis
Amphiarthrosis
Diarthrosis
Synarthrosis
Immovable Joint
Amphiarthrosis
Slightly moveable joint
Diarthrosis
Freely moveable joint
Fibrous Joints
Formed by mass of connective tissue between neighbouring bones
Cartilaginous Joints
Mass of cartilage between neighbouring bones
Synovial Joints
Lubricated synovial cavity encapsulates joints
Ligaments
Dense regular or dense irregular connective tissue binding bone to bone
Fibrous Joints
Neighbouring bones held together by solid mass of dense irregular connective tissue
3 types of fibrous joints
Sutures
Syndesmoses
Interosseous Membrane
Sutures
Thin layer of dense irregular connective tissue called a sutural ligament
Syndesmoses
Greater distance between articulating surfaces and more connective tissue than a suture
Gomphosis
Cone shaped peg fits in a socket- teeth and roots
Interosseous Membrane
Sheet of dense irregular connective tissue joins neighbouring log bones
Cartilaginous Joints
Solid connective tissue allows little or no movement between bones
2 types of cartilaginous joints
Synchondroses
Symphyses
Synchondroses
Immovable joint where connective tissue is hyaline cartilage
Symphyses
Ends of articulating bones are covered in hyaline cartilage but connected by a fibrocartilage disc- only occur on midline of body
Synovial Joints
Synovial cavity surrounded by connective tissue capsule
Articular Cartilage
Hyaline cartilage covering bones in synovial capsule
Articular capsule
Surrounds synovial joints and unites bones
2 layers of articular capsule
Fibrous Membrane
Synovial Membrane
Fibrous Membrane
Dense irregular connective tissue connects to periosteum of articulating bones
Synovial membrane
Inner membrane composed of synovial cells on surface and areolar connective tissue with elastic fibers beneath
Articular Fat Pads
Synovial membrane with accumulated adipose tissue
Synovial fluid
thin film over surfaces in articular capsule
2 components of synovial fluid
Hyaluronic Acid
Interstitial Fluid
Extrascapular Ligaments
Outside articular capsule
Intrascapular Ligaments
Inside articular capsule
Articular Discs
Fibrocatilage not covered by synovial membrane divide synovial cavity into two smaller cavities so different movements can occur
Menisci
Incomplete articular discs partially divide joint and bind to the fibrous membrane
Labrum
Fibrocartilaginous lip extends from socket to increase surface area between ball and socket
Bursae
Sac like structures that resemble joint capsules alleviate friction
Tendon Sheaths
Tubelike bursae wrap around tendons experiencing friction
Gliding
Nearly flat bone surfaces slide back and forth and side to side
Angular Movements
Increase or decrease angle between articulating bones
Flexion
Decrease angle between bones
Extension
Increase angle between bones to move back into anatomical position