arthrology. arthrology definition: greek, (arthro= joint), (logos= science). arthrology is study of...
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Arthrology
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Arthrology
Definition:• Greek, (arthro= joint),
(logos= science).
• Arthrology is study of joints
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Joints
• Joints are places where two or more bones are connected
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Classification Based on Structure
1. Non movable
2. Semi-moveable
3. movable.
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Non Moveable Joints
• Bones connected by fibrous tissue
• No joint cavity
a) Skullb) Fibula - Tibia
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Skull (Sutures)
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Tibia – Fibula (Syndesmoses)
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Semi moveable joints
- The bones are connected by cartilage
- There is no joint cavity
A. RibcageB. In between Vertebrae
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Ribcage
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In between Vertebrae
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Cartilage
• Soft bone• Found in ear, nose and
joints
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Synovial Joints
• Most movable joints in the body
• There is a joint cavity. • Cartilage covers the
ends of the opposing bones)
• Ligaments keep bones together
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Synovial joint
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Arthritis
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Types of Moveable Joints
1. Ball and Socket Joint Allow for the most
freedom of movement
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Types of Moveable Joints
2. Hinge jointallows movement in only one direction. Back and forth
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Types of Joints
3. Pivot joint– Allows rotation
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Types of Joints
4. Saddle joint - Thumb
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Types of Moveable Joints
5. Condyloid joint One bone is
slightly rounded and fits in the other one
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Types of Moveable Joints
6. Sliding or gliding joint - Two flat surfaces
that slide over each other
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Types of JointsJoint Type Example
Ball and Socket
Hinge
Saddle
Pivot
Condyloid
Gliding
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Basic Structure & General Anatomy
• Articular capsule encloses joint cavity– continuous with periosteum– lined by synovial membrane
• Synovial fluid = slippery fluid; feeds cartilages• Articular cartilage = hyaline cartilage covering the joint
surfaces• Articular discs and menisci
– jaw, wrist, sternoclavicular and knee joints– absorbs shock, guides bone movements and distributes forces
• Tendon attaches muscle to bone• Ligament attaches bone to bone
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Tendon Sheaths and Bursae
• Bursa = saclike extension of joint capsule – between nearby structures so
slide more easily past each other
• Tendon sheaths = cylinders of connective tissue lined with synovial membrane and wrapped around a tendon
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Bursae and Tendon Sheaths
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Classification Based on Function
• Synarthroses-immovable joints (sutures)• Amphiarthroses- slightly movable
joints( fibrous connection)( intervetebral discs)• Diarthroses-freely movable joints( synovial)
• Synarthroses and amphiarthroses are largely restricted to the axial skeleton
• Diarthroses predominate in the limbs.
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Summary of Joint ClassificationStructural Class Characteristics Types Mobility
Fibrous Bones united by collagen fibers
1. Suture2. Syndesmosis3. gomphosis
1. Immobile (synarthrosis)
2. Slightly moveable (amphiarthrosis)
3. Immobile
Cartilaginous Bone ends united by cartilage
1. Synchondrosis (hyaline)
2. Symphysis (fibrocartliage)
1. Immobile2. Slightly moveable
Synovial Bone ends covered with articular cartilage and enclosed within a capsule lined with a synovial membrane
1. Plane2. Hinge3. Pivot4. Condyloid5. Saddle6. Ball and socket
Freely moveable (diarthrosis) which depends on joint design