Articulations. Articulations (Joints) Articulations – wherever 2 bones meet Classified by function...
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Transcript of Articulations. Articulations (Joints) Articulations – wherever 2 bones meet Classified by function...
![Page 1: Articulations. Articulations (Joints) Articulations – wherever 2 bones meet Classified by function –Synarthrosis (Immovable) –Amphiarthrosis (slightly.](https://reader036.fdocuments.us/reader036/viewer/2022062304/56649cc05503460f949875d9/html5/thumbnails/1.jpg)
Articulations
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Articulations (Joints)• Articulations – wherever 2 bones meet
• Classified by function– Synarthrosis (Immovable)– Amphiarthrosis (slightly movable)– Diarthrosis - (synovial or freely movable
joints)
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Synathrosis (no movement)• Sutures
– Bones of the skull
• Gomphosis– Ligament bonds tooth w/in bony socket
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Amphiarthroses (Slightly Movable)• Fibrous joint connected
by ligament– Ex. Distal articulation
between tibia and fibula
• Symphysis– Bones joined by disk of
fibrocartilage– Ex. Vertebrae, between
pubic bones
• Cartilaginous– Connection between rib
and sternum
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Angular Movements of Diarthrotic Synovial Joints
– Angular Motion• Flexion – reduces
angle between articulating elements
• Extension - increases angle between articulating elements
• Adduction – moving towards midline
• Abduction – moving away from midline
• Circumduction – loop motion
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Rotational Movements of Diarthrotic Synovial Joints
• Rotational
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Special Movements
– Inversion- turns sole of foot inward (opp-eversion)
– Dorsiflexion- ankle flexion (plantar flexion pointed toe)
– Opposition – grasping (thumb/fingers toward hand)
– Protraction - move anterior across horizontal plane (opp retraction)
– Elevation – move superior (opp depression)
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Structural Classification of Synovial Joints
• Gliding – flat surfaces slide past one another– Ends of clavicles– Between carpals & tarsals– Between vertebrae
• Hinge – angular movement in a single direction– Occipital bone and atlas– Elbow, knee, ankle– Interphalangeal joints
• Pivot – permit rotation only– Atlas and axis– Proximal radius and ulna
• Ellipsodial – angular motion occurs in 2 planes– Radius w/proximal carpals– Phalanges w/metacarpals (and metatarsals)
• Saddle- permits angular motion but prevents rotation
– thumb• Ball and socket - round head rests within
depression– Shoulder and hips
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Double Jointed?
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Can you do this?
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