Module 2 Quiz Flashcards
What are the 3 major structural classifications of a joint?
- Fibrous
- Cartilaginous
- Synovial
Joints ______ movement
allow
Muscles _________ movement
create
Ligament/joint capsules _______ movement
limit
How is “muscles create movement” too simplistic?
Muscles create a force on the bones of a joint. It can create movement or stop/modify a movement.
What is the closed-packed position?
Position at which joint is most stable; usually result of max congruency and max ligament tightness
What is a congruent joint?
Articular surfaces of bones best fit each other
What is the open-packed position?
Any position of joint where combo of poor congruency and lax ligaments results in greater mobility and poorer stability
The more mobile a joint is, the less _____ it is (and vice versa)
stable
What 3 factors determine the balance of mobility and stability of a joint?
- Shape of bones
- Ligament/joint capsule complex
- Musculature of the joint (big ms = less mob)
What are the weight-bearing joints?
Almost all lower extremity joints and spinal joints
What is a fibrous joint?
Joint in which bones are held together by dense fibrous connective tissue
What is a cartilaginous joint?
Joint in which bones are held together by either fibrocartilage or hyaline cartilage
What is a synovial joint?
Joint in which bones are connected by a joint capsule, which is composed of 2 distinct layers (an outer fibrous layer and an inner synovial layer)
Which joints do not have a joint cavity?
Fibrous and cartilaginous
The articular ends of bones in a joint cavity are lined with what?
Hyaline cartilage (articular cartilage)
What is a synarthrotic joint?
Allows little to no movement
What is an amphiarthrotic joint?
Allows moderate amount of movement
What is a diarthrotic joint?
Allows a lot of movement
What are the 3 sub-types of synarthroses?
Synostoses (bony)
Syndesmoses (fibrous)
Synchondroses (cartilaginous)
What are the 3 sub-types of fibrous joints?
Syndesmosis
Suture
Gomphosis
What is a syndesmosis joint?
United by fibrous ligament or aponeurosis
What is a suture joint?
United by thin layer of fibrous material
What is a gomphosis joint?
Peg-in-hole shaped bones united by fibrous material
What type of joint is the interosseous membrane of the forearm?
Fibrous syndesmosis
What is synostosis?
Joint that has fused over with bone (ex: cranial suture joints)
What is the only gomphosis joint?
Teeth and mandible (movement only allowed early in life)
What kind of cartilage is in a cartilaginous joint?
Fibrocartilage or hyaline cartilage
2 sub-types of cartilaginous joints
Symphysis
Synchondrosis
What is a symphysis joint?
Fibrocartilage in form of disc unites bodies of 2 bones
What type of joint is intervertebral disc joint or pubic symphysis?
Carilaginous symphysis
What is a synchondrosis joint?
Hyaline cartilage unites 2 bones
What type of joint is the costal cartilage between a rib and sternum?
Cartilaginous synchondrosis
What type of joints are wrist, elbow, shoulder, ankle, knee, hip?
Synovial
What secretes synovial fluid into a joint cavity?
Inner synovial membrane layer
What is a ligament?
Fibrous structure that attaches from bone to bone
What is ligament primarily made of?
Collagen fibers
Why is it called “ligamentous/joint capsule complex”?
Some ligaments evolved independent of fibrous capsule; other ligaments never fully separated and are considered thickenings of the fibrous capsule
Are ligaments extra- or intra-articular (outside or inside the joint capsule)?
Mostly outside
What is a muscle?
Soft tissue specialized to contract
What kind of tendon is the long head of the biceps at the shoulder joint? (intra or extra-articular?)
intra-articular
What is a uniaxial joint?
Allows motion around 1 axis in 1 plane
What is a biaxial joint?
Allows motion around 2 axes in 2 planes
What is a triaxial joint? (polyaxial)
Allows motion around 3 axes in 3 planes
What is a nonaxial joint?
Allows motion within a plane, but only gliding
What are 2 sub-types of uniaxial synovial joint?
Hinge
Pivot
What is a hinge joint?
Surface of one bone is spool-like and other bone is concave
Example of hinge joint
Elbow, ankle
What is a pivot joint?
One surface shaped like a ring, other surface shaped to rotate within ring
Example of pivot joint
Atlantoaxial (atlas [C1] and odontoid process [dens, C2]), proximal radio-ulnar (radial notch of ulna and annular ligament)
2 sub-types of biaxial joint?
Condyloid (ovoid, ellipsoid)
Saddle (sellar)
What is a condyloid joint?
One bone concave, other convex
Example of condyloid joint?
MCP joint, radiocarpal joint
What is a saddle joint?
Modified condyloid joint; both bones has convexity and concavity to surface; convexity of one fits into concavity of other and vice versa
Example of saddle joint?
CMC (carpometacarpal), sternoclavicular
Which actions can condyloid joints perform?
Flexion/Extension (sagittal)
Adduction/Abduction (frontal)
What plane does flexion/extension occur in the thumb? Adduction/Abduction?
F/E occurs in frontal, Ad/Ab in sagittal (due to orientation of thumb)
If the saddle joint of the thumb moves in all three cardinal planes, why is it a biaxial joint?
Only allows motion around 2 axes
What is the only major type of triaxial synovial joint?
Ball-and-socket joint
What kind of joints are intercarpal joints (between carpal bones) or facet joints?
Nonaxial synovial joints
What are menisci and articular discs? What are their function?
Additional intra-articular fibrocartilage that maximizes congruency of a joint - this maintains normal joint movements and cushion the joint.
What is an articular disc?
Ring-shaped fibrocartilaginous structure that increases joint congruency
What is a meniscus?
Crescent shaped fibrocartilaginous structure that increases joint congruency
Where would you find an articular disc?
TMJ, SCJ
Where would you find articular menisci?
Between tibia and femur
How many moveable elements of the spine?
26
How many bones in the coccyx?
4
What is a scoliosis?
Any spinal curve that exists from a posterior view of the spine
What is a left lumbar scoliosis?
Curve in lumbar spine convex to the left
What are the primary spinal curves?
Formed before birth (thoracic and sacrococcygeal)
What are the secondary spinal curves?
Formed after birth (lumbar and cervical)
What does kyphotic mean?
Concave anteriorly, convex posteriorly