BIOL 220: Ch. 9 Flashcards
Terms and Concepts from Chapter 9: Articulations
articulation (joint)
place where a bone meets another bone, cartilage, or teeth
articulations vary in ____ and ____ and are classified into categories based on these qualities
stability and mobility
more mobility in an articulation means _____ and vice versa
less stability
classification of joints by structure
fibrous
cartilaginous
synovial
fibrous joint
bones held together by dense regular connective tissue
cartilaginous joint
bones joined by cartilage
synovial
bones separated by fluid-filled joint cavity
classification of joints by function
synarthrosis
amphiarthrosis
diarthrosis
fibrous joint types
gomphoses
sutures
sydesmoses
gomphoses and function
joints between teeth and maxilia and mandible; synarthroses
sutures and function
joints between skull bones; synarthroses
syndesmoses and function
joints between parallel bones in the forearm and leg (radius and ulna, tibia and fibula); ampiarthroses
cartilaginous joint types
synchondroses
sympheses
synchondroses and function
bones joined by hyaline cartilage; synarthroses
symphyses and function
bones joined by pad of fibrocartilage; amphiarthroses
synovial joint function
diarthroses
general anatomy of synovial joints (6)
articular capsule joint cavity synovial fluid articular cartilage ligaments nerves and blood vessels
articular capsule (synovial joints) layers
- outer fibrous layer
- inner synovial membrane
outer fibrous layer of articular capsule
dense regular CT, strengthens joint
inner synovial membrane of articular capsule
secretes synovial fluid
articular cartilage (synovial joint)
articular surfaces in synovial joints are covered by hyaline cartilage; reduces friction and acts as shock absorber
joint cavity (synovial joints)
space between articulating bones; contains small amount of synovial fluid
synovial fluid functions
lubricates and nourishes articular cartilages
nourishes chondrocytes of articular cartilage
absorbs shock during compression of the joint
ligaments (synovial joints)
connect bone to bone; dense regular connective tissue; strengthen and reinforce capsule
sensory nerves (synovial joints)
detect pain and amount of stretch in a joint
blood vessels (synovial joints)
nourish tissues in the joint
accessory structures surrounding synovial joints function to..
reduce friction and fill spaces
accessory structures surrounding synovial joints (3)
bursae
tendon sheaths
fat pads
bursae
sacs outside most synovial joints where ligaments, muscles, tendons, and/or bones rub; contain synovial fluid
tendon sheaths
elongated bursae around tendons, particularly in confined areas (Wrist and ankle) where tendons rubs each other
fat pads
packing material; also provide some protection
types of synovial joints (movement)
uniaxial
biaxial
multiaxial
uniaxial
joint moves in one place or axis
biaxial
joints moves in two places or aces
multiaxial
joint moves in three places or axes
types of synovial joints are classified by ______ of articulating surfaces and amount of ____ allowed
shapes; movement
types of synovial joint motion (4)
- gliding motion
- angular motion
- rotational motion
- special movements
gliding motion
articular surfacs gliding back-and-forth or side-to-side; angle between bones does not change (i.e. plane joints usually)
angular motion
increases or decreases the angle between bones
types of angular motion (7)
flexion extension hyperextension lateral flexion abduction adduction circumduction