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Chapter 8: Joints
Joints
43
Biology
Undergraduate 1
03/24/2014

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Term
Structural Joints: Fibrous
Definition
Fibrous connective tissue joins bones
Term
Structual Joints: Cartilaginous
Definition
Cartilage directly unites bones
Term
Structual Joints: Synovial
Definition
Bones are separated by a fluid-filled joint cavity
Term
Functional Joints: Synarthroses
Definition
Immovable joints
Term
Functional Joints: Amphiarthroses
Definition
Slightly movable joints
Term
Functional Joints: Diarthroses
Definition
Freely movable joints
Term
Fibrous Joints: Sutures
Definition
Joints between skull bones
Term
Fibrous Joints: Syndesmoses
Definition
A ligament of fibrous connective issue that connects bone
Term
Fibrous Joints: Gomphoses
Definition
Teeth in their sockets
Term
Cartilaginous Joints: Synchondroses
Definition
Hyaline cartilage directly connects bone
Term
Cartilaginous Joints: Symphyses
Definition
Fibrocartilage joint that connects bone
Term
Synovial Joints
Definition
  • Joints in which the bones are separated by a fluid-filled joint cavity
  • All are diarthroses (freely movable)
  • Examples: all limb joints and most joints of the body
Term
Articular Cartilage (hyaline cartilage)
Definition
Provides a smooth, slippery, cushioning suface on ends of bones
Term
Joint (synovial) cavity
Definition
Filled with a lubricating synovial fluid
Term
Articular Capsule: Fibrous Capsule
Definition
Outer dense irregular connective tissue supports the joint

Term
Articular Capsule: Synovial Membrane
Definition
Inner membrane produces synovial fluid
Term
Synovial Fluid
Definition
  • Occupies the joint cavity
  • Lubricates and nourishes cartilages of the joint surfaces
Term
Reinforcing Ligaments or Structures: Ligaments
Definition
Connective tissue bands connecting bones
Term
Reinforcing Ligaments or Structures: Fatty Pads and Articular Discs
Definition
Fat or fibrocartilage (menisci) adds extra cushioning
Term
Bursae
Definition
Flattened, fibrous sacs filled with synovial fluid; common where structures like ligaments, tendons, or bones rub together
Term
Tendon Sheaths
Definition
Elongated bursae that wrap completely around a tendon
Term
Articular Surfaces
Definition
Shape determines what movements are possible
Term
Ligaments
Definition
Unite bones and prevent excessive or undesirable motion
Term
Muscle Tone (slight constant muscle tension)
Definition
Tenons that are kept tight at all times by a muscle tone; muscle tendons across joints act as stabilizing factors
Term
Tendon of the Quadriceps Femoris Muscle
Definition
Tendon that connects to the knee cap
Term
Patellar Ligament
Definition
Ligament that connects the patella to the tibula tuberosity
Term
Lateral and Medial Patellar Retinacula
Definition
Either side of the knee cap
Term
Fibular (lateral) Collateral Ligament
Definition
LCL
Term
Tibial (medial) Collateral Ligament
Definition
MCL
Term
Anterior Cruciate Ligament
Definition
ACL; inside the knee
Term
Posteior Cruciate Ligament
Definition
PCL
Term
Medial and Lateral Meniscus
Definition
Tendon in the knee
Term
Synovial Joints: Shoulder (Glenohumeral)
Definition
  • Ball-and-socket joint in which stability is sacrificed to obtain greater freedom of movement
  • Head of humerus articulates with the glenoid cavity of the scapula
Term
Shoulder Stability
Definition

Weak stability is maintained by:

  • Thin, loose joint capsule
  • Four ligaments - coracohumeral and three glenohumeral
  • Tendon of the long head of the biceps brachi muscle
  • Rotator cuff: tendons of four muscles that encircle that shoulder joint and blend with the articular capsule 
Term
Joint Injuries: Sprains
Definition
The ligaments reinforcing a joint are stretched or torn; partially torn ligaments slowly repair themselves; completely torn ligaments require surgical repair
Term
Joint Injuries: Cartilage Injuries
Definition
Overstressed cartilage tears, common in the knee menisci; may result in cartilage fragments in the joint; may be repaired with surgery; removal of damaged cartilage and fragments
Term
Joint Injuries: Dislocation (luxation)
Definition
Occurs when bones are forced out of alignment; usually accompanied by sprains, inflammation, and joint immobilization; caused by serious falls and are common sports injuries; subluxation partial dislocation of a joint
Term
Inflammatory and Degenerative Conditions: Bursitis
Definition
An inflammation of a bursa, usually caused by a blow or friction; symptoms are pain and swelling; treated with an anti-inflammatory drug; excessive fluid may be aspirated
Term
Inflammatory and Degenerative Conditions: Tendonitis
Definition
Inflammation of tendon sheaths typically caused by overuse; symptoms and treatment are similar to bursitis
Term
Arthritis
Definition
More than 100 different types of inflammatory or degenerative diseases that damage the joints; symptoms include pain, stiffness, and swelling of a joint; chronic forms include osteoarthritis, rheumatoid arthritis, and gouty arthritis
Term
Osteoarthritis
Definition
Most common; often called "wear-and-tear" arthritis; 85% of all Americans develop this; more prevalent in the aged, and is probably related to the normal aging process
Term
Rheumatoid Arthritis
Definition
Chronic, inflammatory, autoimmune disease of an unknown cause; usually arises between ages of 40-50, but may occur at any age; signs and symptoms include joint tenderness, osteoporosis, muscle atrophy, and cardiovascular problems; the cause of this is marked with flare-ups and remissions
Term
Gouty Arthritis
Definition
Deposition of uric acid crystals in the joint and soft tissues, followed by an inflammatory response; typically affects the joing at the base of the big toe; if untreated, the bone ends fuse and immobilize the joint
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