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chapt8 review ?
| Question | Answer |
|---|---|
| synarthroses | immovable joints |
| amphiarthroses | slightly movable joints |
| diarthroses | freely movable joints |
| fibrous joints | bones joined by fibrous tissue,dense fibrous connective tissue, no joint cavity |
| 3 types of fibrous joints | sutures syndesmoses gomphoses |
| sutures | found only in the skull. "seams" interlock bone |
| syndesmoses | bones are connected exclusively by ligaments,cords or bands of fibrous tissue |
| gomphoses | peg-in-socket fibrous joint. tooth is only ie: |
| cartilaginous joint | articulating bones are united by cartilage. not highly movable |
| 2 types of cartilaginous joints | synchondroses and symphyses |
| synchondrosis | a joint in which the bones are united by hyaline cartilage |
| symphyses | a joint in which the bones are connected by fibrocartilage |
| synovial joint | freely movable joints in which the articulating bones are separated by fluid-containing joint cavity. |
| articulations | another term for joint |
| synarthroses | what functional joint class contains the least mobile joints? |
| symphyses/synchondroses | of sutures, symphyses/synchondroses, which are cartilaginous joints? |
| the more stable the joint the less mobile it is | how are joint mobility/stability related? |
| 6 features of synovial joints | articular cartilage/joint cavity/articular capsule/synovial fluid/reinforcing ligaments/nerves and blood vessels |
| bursae | flattened fibrous sacs lined with synovila membrane/containing synovial fluid. occur where bones rub together |
| tendon sheath | elongated bursa that wraps around tendon subjected to friction |
| fibrous capsule/synovial membrane | what are 2 layers of articular capsule? |
| help to reduce friction during joint movement | how do bursae/tendon sheaths improve joint function? |
| muscle tendons that cross the joint | what factor is most important in stabilizing synovial joints? |
| help keep joint cartilages nourished and lubricates the joint surfaces | what is importance of weeping lubrication? |
| flexion | bending movement on sagittal plane that DECREASES the angle of joint/and brings bones closer together ie: bending knee |
| extension | movement along sagittal plane that INCREASES the angle of bones and straightens a limb. ie:straightening knee |
| circumduction | moving limb so it describes a cone in space |
| rotation | turning of bone around its own long axis. turning head left to right |
| supination | "turning backwards" movements of radius around ulna |
| pronation | "turning forward" movements of radius and ulna |
| dorsiflexion | lifting foot so it is superior surface approaches the shin |
| plantar flexion | depressing the foot (pointing toes) |
| elevation | lifting a body part superiorly |
| depression | moving elevated part inferiorly |
| opposition | movement when you touch your thumb to the tips of the other fingers on the same hand |
| plane joints | SJ: surfaces are flat and allow only short NONAXIAL gliding movements ie; intercarpal/intertarsal joints. between vertebral articular processes |
| hinge joints | SJ:cylindrical end of one bone conforms to a trough-shaped surface on another. |
| hinge joints | SJ: motion is alon a single plane. UNIAXIAL: permits flexion/extension only ie:knee/elbow |
| pivot joints | SJ: rounded end of one bone conforms to a "sleeve" of another. UNIAXIAL rotation of one bone around its own long axis. ie: head saying NO |
| condyloid joints | SJ: one bone fits into a complementary depression in another. both surfaces are oval |
| condyloid joints | SJ: BIAXIAL permits all motions ie:wrist |
| saddle joints | SJ: resemble condyloid joints,but allow greater freedom of movement. ie: twiddling your thumbs |
| ball/socket joints | SJ:spherical head of one bone articulates w. the cuplike socket of another. |
| ball/socket joints | SJ: MULTIAXIAL joints/ are most freely moving ie:shoulder/hip only |
| hinge/pivot | which joints are uniaxial? hinge condyloid saddle or pivot |