Anatomy & Physiology: Skeletal System and Joints
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A point of contact between two bones, bones and teeth, or bones and cartilage.
Based on the presence of a synovial cavity and the type of tissue connecting the bones.
Based on the degree of movement: synarthrosis (no movement), amphiarthrosis (slight movement), diarthrosis (free movement).
Movement in one plane or around one axis, e.g., the elbow joint.
Joints that lack a synovial cavity, connected by dense regular connective tissue, allowing no or slight movement.
Sutures, gomphoses, and syndesmoses.
They lack a synovial cavity, have hyaline cartilage, and allow no or slight movement.
Epiphyseal plate and joint between the 1st rib and sternum.
Cartilaginous joints with fibrocartilage present, allowing slight movement (amphiarthrosis).
Intervertebral joints, intervertebral discs, and pubic symphysis.
Joints with a synovial cavity, containing synovial fluid, allowing free movement (diarthrosis).
Articular cartilage, articular capsule, menisci, bursae, and accessory ligaments (extracapsular and intracapsular).
It lubricates and nourishes the joint, reducing friction.
Sliding motion where bones remain in contact without changing the angle, e.g., intercarpal joints.
Bone revolves around its longitudinal axis, seen in shoulder and hip joints.
Movements that change the angle between bones: flexion, extension, hyperextension, abduction, adduction, circumduction.
Movement where the distal end of a body part moves in a circular path, combining flexion, abduction, extension, and adduction.
Elevation/depression, protraction/retraction, inversion/eversion, dorsiflexion/plantarflexion, pronation/supination, opposition.
Planar (nonaxial), hinge (uniaxial), pivot (uniaxial), condylar (biaxial), saddle (biaxial), ball-and-socket (multiaxial).
The range through which bones of a joint can be moved, depending on joint type and structure.
206 bones divided into the axial skeleton (80 bones) and appendicular skeleton (126 bones).
Skull, vertebral column, and thorax.
Upper and lower limbs and their girdles (pectoral and pelvic girdles).
Immovable joints between cranial bones, e.g., coronal, sagittal, and lambdoid sutures.
Manubrium, body, and xiphoid process.
True ribs (1-7) attach directly to sternum; false ribs (8-10) attach via cartilage; floating ribs (11-12) have no sternal attachment.
Clavicle and scapula.
Provides stable support for lower limbs and bears body weight.
Ilium, pubis, and ischium.
Female pelvis is broader and shallower with a wider pubic angle (>90°), wider sciatic notch, and oval pelvic outline; male pelvis is narrower with a smaller pubic angle (<90°).