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Skeletal System 2

Skeletal System-Joints

Joints Union between two or more bones Classified on basis of structural features: fibrous, cartilaginous, and synovial types
Joints innervation Hilton's Law: HiNerve supplying joint also supplies muscles that move the joint and the skin covering the insertion of such muscles
Fibrous Joints Synarthroses Joined by fibrous tissue, have no joint cavities, and allow little movement
Fibrous Connective Tissue Connect Sutures- found between Flat bones of Skull Syndesmoses- occur as the inferior tibiofibular and tympanostapedial syndesmoses
Cartilaginous Joints United by cartilage and have no joint cavity
Primary Cartilaginous Joints Synchondroses United by HYALINE cartilage Do not allow movement but growth in the length of the bone
Primary Cartilaginous Joints Examples Epiphyseal cartilage plates= union between epiphysis and diaphysis of growing bone Spneno-occipital and manubriosternal synchondroses
Secondary Cartilaginous Joints Symphyses Joined by FIBROCARTILAGE Slightly movable joints
Secondary Cartilaginous Joints Examples Pubic symphysis and interval disks
Synovial Joints Diarthrodial Permit great degree of free movement Classified according to shape of articulation and/or type of movement
Synovial Joints: Plane (Gliding) Joints United by two flat articular surfaces Allow simple gliding or sliding of one bone over another
Synovial Joints: Plane (Gliding) Joints Examples In the proximal tibiofibular, intertarsal, intermetacarpal, sternoclavicular, and acromioclavicular joints
Synovial Joints: Hinge (Ginglymus)Joints Resembles door hinge Allow only flexion and extension
Synovial Joints: Hinge (Ginglymus)Joints Examples In the elbow, ankle, and interphalangeal joints
Synovial Joints: Pivot (Trochoid) Joints Formed by central bony pivot turning within a bony ring Only allows rotation
Synovial Joints: Pivot (Trochoid) Joints Examples In the superior and inferior radioulnar joints and in the atrantoaxial joint
Synovial Joints: Condylar (Ellipsoidal) Joints Two convex condyles articulating with two concave condyles Shape of articulation is ellipsoidal Allow flexion and extension
Synovial Joints: Condylar (Ellipsoidal) Joints Examples In the wrist (radiocarpal), metacarpophalengeal, knee (tibiofemoral), and atlanto-occipital joints
Synovial Joints: Saddle (Sellar) Joints Resemble a horse's saddle Allow flexion and extension, abduction and adduction, and circumduction but no axial rotation
Synovial Joints: Saddle (Sellar) Joints Examples In the carpometacarpal joint of th thumb and between femur and patella
Synovial Joints: Ball-and-socket (Spheroidal) Joints Formed by reception of globular head into a cup-sapped cavity Allow movement in many directions: flexion and extension, abduction and adduction, medial and lateral rotations, and circumduction
Synovial Joints: Ball-and-socket (Spheroidal) Joints Examples In the shoulder and hip joints
Created by: mmarino001



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