Joints Flashcards
Structures of human knee
- quadriceps femoris tendon: Connects the quadriceps femoris to the patellar ligament
- patellar ligament: Connects the quadriceps femoris tendon to the tibial tuberosity.
- tibial (medial) collateral ligament: Originates from the medial epicondyle of the femur and attaches to the medial surface of the tibia.
- fibular (lateral) collateral ligament: Originates from lateral epicondyle of the femur and inserts into the head of the fibula.
- Anterior cruciate ligament: Attaches posteriorly in the intercondylar fossa of the femur to the anterior of the intercondylar area of the tibia.
- Posterior cruciate ligament: Is posterior, runs from the medial condyle of the femur and the intercondylar area of the tibia. Posteriorly attaches to the surface of medial condyle of femur and
- Lateral meniscus: Lateral “pad” between tibia and fibia
- Medial Meniscus: Medial “pad” between tibia and fibia
Name the three ligaments (we need to know) on the hip
- iliofemoral ligament: Large ligament shaped like an inverted y. Anterior and superior to the hip joint. Large ligament “on top” of hip joint
- pubofemoral ligament: Is anterior to hip joint, deep to iliofemoral joint. Attaches to the pubis anteriorly
- ischiofemoral ligament: Is posterior to the hip joint. Attaches to ischia posteriorly.
Structure of the shoulder
- coracoacromial ligament: attaches acromion to coracoid process.
- coracohumeral ligament: Runs from posterior / inferior border of coracoid process to the greater and lesser tubercles of the humerus.
- glenohumeral ligament: anterior, three ligaments, inferior, middle and superior.
- subscapularis: subscapular fossa
- teres minor: Inferior to infraspinatus muscle
- supraspinatus: covers supraspinous fossa
- infraspinatus: covers infraspinous fossa
teres major is not part of rotator cuff
What are articulations (joints)
A point of contact between, two bones, between bone and cartilage, or between bone and teeth.
- joint structure determines the direction and distance of movement (range of motion). As joint strength increases mobility decreases.
Range of motion (ROM) is the measurement of the movement around a specific joint or body part. It refers to the distance and direction a joint can move to its full potential. ROM is typically measured in degrees and is used to assess the flexibility, strength, and overall function of the joint.
Describe two manners to classify joints
- Functional classification: Based on the range of motion of the joint. Synarthrosis (immovable), Amphiarthrosis (slightly movable), diarthrosis (freely movable)
- Structural classification: relies on the anatomical organization of the joint. Fibrous, cartilaginous, synovial.
What are the structural classifications of joints?
- fibrous
- cartilaginous
- synovial: includes ball-and-socket, hinge, plane, condylar, saddle
What are the functional classifications of joints?
- Synarthrosis: immovable joints. Fibrous or cartilaginous connections, may fuse over time.
- Amphiarthrosis: slightly movable. Little movment. Fibrous or cartilaginous connections.
- Diarthrosis: freely movable joint / synovial joints. More movement and subdivided by movement type.
Name 4 types of Synarthrotic Joints
- Suture: Only found in the skull, bones interlocked and bound by a dense fibrous connective tissue.
- Gomphosis: Fibrous connection via periodontal ligament, binds teeth to sockets. Tooth anchored into socket in the alveolar process.
- Synchondrosis: A rigid cartilaginous bridge between two bones. Epiphyseal plate of long bones, joint between rib 1 and sternum.
- Synostosis: Fused bones, immovable. Frontal suture of the skull, epiphyseal line of long bones.
suture joints of the skull can become synostosis joints. During early development and childhood, the bones of the skull are connected by suture joints, which are fibrous joints that allow for slight movement and growth. As a person matures, these suture joints gradually ossify and fuse, transforming into synostosis joints, resulting in a rigid and immovable connection between the skull bones.
Name two types of Amphiarthrotic Joints
- Syndesmosis: Bones connected by ligaments (connection between the tibia and fibula and radius and ulna.
- symphysis Bones separated by fibrocartilage (pubic symphysis, intervertebral joint)
Names types of synovial joints
- Plane: nonaxial (multiaxial): Gliding / sliding
- Hinge: monoaxial: flexion / extension
- Pivot: monoaxial: rotation around a single axis
- condylar: biaxial: flexion, extension, abduction, adduction, circumduction
- saddle: biaxial: flexion, extension, abduction, adduction, cirucmduction (greater range than condylar)
- ball and socket: triaxial: flexion, extension, abduction, adduction, circumduction, rotation
freely moveable joint, typically at ends of long bones, lined with synovial membrane
Describe Plane joints
Occurs at flat articular surfaces
Examples: intercarpal, intertarsal, articular process of vertebrae (facet joints).
Movement type: Allows short nonaxial / multiaxial gliding movements. Abduction/adduction of the wrist,
Describe Hing joints
Occurs at cylindrical end of one bone which fits into the trough-shaped end of another bone
Examples: elbow, knee joints, and interphalangeal joints.
Movement Type: monaxial -> flexion and extension
Describe Pivot Joints
Occurs at rounded process of one bone, which conform nicely to ring of bone on second bone
Examples: Atlantoaxial articulation (no with head), proximal radioulnar joint).
Movement Type: Allows monaxial movements, rotation of the head pronation / supination of the forearm.
Describe Condylar Joints
Occurs where condyles articulate with fossa
Examples: Metacarpals with respective phalanges, atlanto-occipital joint
Movement Type: Allows Biaxial movements (flexion / extension; abuction / adduction, circumduction
abduction of fingers spreading them out
Describe Saddle Joints
Occurs where bones come together like a rider in a saddle or two kidney beans touching.
Examples: Trapeziometacarpal joint (thumb), sternoclavicular joint
Movement Type: Allows biaxial movements (flexion and extension / abduction and adduction), circumduction, and opposition (JUST at trapeziometacarpal joint moving thumb to touch fingertips)