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Skeletal System Day6

Learn the Joints and Their motions

Joints The functional junctions in between bone. Binds bones together. Humans have 230. Classified by type of tissues and movement
Fibrous Joints Between CLOSE bone. Thin layer of connective tissue bins the bones together. Provides no movement EX: Skull
Cartilaginous Joints Hyaline Cartilage binds these to bones. Allows limited movement and absorbs shock. EX: Vertebrae
Synovial Joints Most Joints of the Skeleton. Free movement. Covered with hyaline cartilage and a capsule of connective tissue that binds them. CONTAINS A SYNOVIAL MEMBRANE THAT SECRETES SYNOVIAL FLUID. Located in patella and elbow. Menisci and fluid sacs called Bursa
BALL AND SOCKET JOINT Globe/Egg shaped head, that articulated with a cup shaped cavity. Allows wide range of motion. EX: Shoulder and Hip
CONDYLOID JOINT Oval shaped condial fits into elliptical cavities. Allows a variety of movement. EX: Metacarpals and Phalanges.
HINGE JOINT Convex surface fits into concave surface of another bone. Hinged like a door. EX: Elbow and Phalanges.
PIVOT JOINT Cylinder surface of one bone rotates in a ring of another bone. Allows limited movement around a central axis. EX: Radius and Ulna
Saddle Joint Articulating bones have concave and convex regions. Allows a variety of movements. EX: Carpals and Metacarpals of the thumb
JOINT MOVEMENTS: Occurs at synovial joints. One end of muscle attaches to the immovable end of bone, the other end attaches to movable end. When the muscle contracts it pulls together
flexion bending body parts so that the angle between them decrease. (Bending the arm)
extension straightening the body parts so that the angle between them increases. (Straightening the arm)
Dorsiflexion movement at the ankle that brings the foot closer to the shin. (Walking on your heels)
Plantar Flexion Movement at the ankle that brings the foot farther from the shin. (Pointing toes)
Hyperextension extension of the parts at a joint, beyond the anatomical position. Usually results in injury. (Whiplash)
ABduction moving a part away from the midline of the body. (Lifting the arm away from body).
ADduction Moving a part toward the midline of the body. (returning the arm to the side of the body)
Rotation moving a part around an axis. (Twisting the head from side to side)
Circumduction moving a part so that its ends follows a circular path. (Moving finger in a circular motion)
Pronation Turning the hand so that the palm is downward
Supination turning the hand so that the palm is upward
Eversion Turing the foot so that the plantar surface faces laterally
Inversion Turing the foot so that the plantar surface faces medially
Retraction Moving a part backward. (Pulling the head back)
Protraction Moving a part forward. (Thrusting the head forward)
Elevation Raising a part. (Shrugging shoulders)
Depression Lowering a part. (Drooping the shoulders)
Created by: Davigo Soklux



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