ARTICULATIONS Joints in the Human Body. WHAT ARE ARTICULATIONS? Articulations are joints Places...
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Transcript of ARTICULATIONS Joints in the Human Body. WHAT ARE ARTICULATIONS? Articulations are joints Places...
THERE ARE 3 MAJOR CATEGORIES:
Fibrous joints, aka synarthrotic joints
Cartilaginous joints, aka amphiarthrotic
Synovial joints, aka diarthrotic joints
FIBROUS JOINTS - SYNARTHROTIC
Two or more bones joined by fibrous connective tissue
Can have very limited but usually no motion
THREE TYPES OF FIBROUS JOINTS
SUTURES: located between bones of the skull. They are immovable.
FONTANELS are areas of unossified bone in children under two years old.
SYNDESMOSES
In a syndesmosis joint, bones are farther apart than in sutures and they are also connected by ligaments.
GOMPHOSES
A Gomphosis is a “peg” held in a socket by fibrous tissue. Teeth held in the maxilla and mandible by periodontal ligaments are examples..
CARTILAGINOUS JOINTS: Two or more bones connected by
hyaline or fibrocartilage.
This type of joint provides limited motion
TWO TYPES OF CARTILAGINOUS JOINTS:
Synchondroses:
Bones connected by hyaline cartilage
Little or no motion
Ex: epiphyseal plates
Symphyses:
Bones connected by fibrocartilage
Provide slight motion
Ex: vertebrae and pubic bones