3.5: Joints and Connective Tissue Flashcards
What is a joint?
A connection between two bones or a bone and cartilage.
What determines how moveable or immovable a joint is?
Ligaments and how “snug” their fit is.
What is adipose tissue?
Body fat (a connective tissue)
What 6 factors determine the joints’ degree of movement?
Type of structure; Shape of the bones; Flexibility of joint ligaments; Arrangement of strength of associated muscles/tendons; Soft/Adipose tissue (may limit mobility); Hormone production
How are joints classified?
Structure and Function
What are the 3 main structural classifications of joints?
Ligamentous/Fibrous (immovable); Cartilaginous (slightly moveable); Synovial (highly moveable)
What does Synarthrosis mean?
Immovable; as in Ligamentous/Fibrous joints
What is a Ligamentous/Fibrous joint?
No joint activity and bound by strong, fibrous tissue; little to no movement
What are examples of a Ligamentous joint?
A suture joint between the bones of the skull; between tooth and socket of mandible
What does amphiarthrosis mean?
Slightly moveable; as in Cartilaginous joints
What are Cartilaginous joints?
Amphiarthrosis (slightly moveable) joints attached by cartilage or fibro-cartilaginous tissue
What are examples of a Cartilaginous joint?
growth regions of immature long bones (in children); discs between spinal vertebrae
What does diarthrosis mean?
highly moveable; as in Synovial joints
What are Synovial joints?
Joints with space between the articulating bones filled with synovial fluid; cartilage is on the end which cushions bones and decreases friction.
What is a synovial cavity?
The space between articulating bones in a synovial joint.
What is an articular capsule?
Contains two bone ends in a fluid environment — in synovial joints
What are the 6 types of Synovial Joints?
Ball/Socket; Hinge; Pivot; Gliding; Saddle; Condyloid
What are the qualities of Ball and Socket joints?
Highest degree of freedom;
3 planes at one time;
Multiaxial–widest range of motion;
Rounded cavity that fits into a concavity
What are some examples of a ball and socket joint?
Shoulder; Hip
What are the qualities of Hinge joints?
“cylindrical’ joints;
1 plane of motion;
one axis;
Flexion and Extension;
Convex part of bone fits into concave part of another bone
What are some examples of a Hinge Joint?
knee, elbow, ankle
What are the qualities of Pivot Joints?
“cylindrical joints”;
permits rotation;
Pronation and Supination;
Section of a cylinder of bone fits into a cavity of another bone
What are some examples of a pivot joint?
Neck (c1-c2) allows for rotation of neck; Elbow
What are some qualities of Gliding Joints?
“sliding” or “plane” joints;
Non-axial movement (sliding and twisting movements);
Flexion/Extension, Radial/Ulnar deviation (in hand), Pronation/Supination (in foot);
Movement limited by tighter joint capsules;
Slightly curved, nearly flat—allowing bones to slide past each other
What are some examples of Gliding joints?
between Carpals (in hand); between Tarsals (in foot); between articulating processes (in spine), AC joint in shoulder
What are some qualities of Saddle Joints?
Movement in 2 planes and 2 axes;
Flexion/Extension, Adduction/Abduction, Circumduction;
Small amount of rotational movement;
Concave and convex surfaces (shaped like saddle)
What is an example of a Saddle joint?
Thumbs (base of thumb and wrist); SC joint
What are some qualities of a Condyloid Joint?
“ellipsoidal”;
2 planes and 2 axes;
Flexion/Extension, Adduction/Abduction;
No rotational movement;
Oval shaped condyle (round at end) that fits into an elliptical cavity
What makes up the Shoulder Joint?
Scapula and Clavicle
What are the 3 joints of the Shoulder Complex?
Sternoclavicular (SC); Acromioclavicular (AC); Glenohumeral (GH)
What is the Sternoclavicular (SC) joint?
Saddle type synovial joint between the clavicle and the sternum
What is the Acromioclavicular (AC) joint?
Gliding type synovial joint at the opposite end of the SC joint which articulates with the scapula
What is the Glenohumeral (GH) joint?
Ball and Socket joint with multiaxial movement where the humerus joins the scapula
What is Abduction (shoulder ROM) ?
180 deg, arm up sideways
What is Adduction (shoulder ROM) ?
45 deg, arm toward the midline of the body
What is Horizontal Abduction (shoulder ROM) ?
Transverse plane, 45 deg, arm horizontally backward
What is Vertical Extension (shoulder ROM) ?
60 deg, arm straight backward
What is Horizontal Adduction (shoulder ROM) ?
Transverse plane, 130 deg, arm horizontally forward
What is Vertical Flexion (shoulder ROM) ?
180 deg, arm straight forward