Why do the ribs have joint? why are they immovable?
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The ribs are immovable because they protect the heart and lung from any internal injury. It the ribs start to move then the heart or lungs may get a serious injury.
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Answer:
They are hyaline cartilaginous joints (i.e. synchondrosis or primary cartilagenous joint). Each rib has a depression shaped like a cup that the costal cartilage articulates with. There is normally no movement at these joints. Joints between costal cartilages of the sixth and ninth rib are plane synovial joints.
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