ï»¿ Â Explain various types of synovial joints. from Biology Locomotion and Movement Class 11 Assam Board

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Â Explain various types of synovial joints.

Synovial joints - These joit s are characterised by the presenceÂ of a fluid filled synovialÂ cavity between the articulating surfaces of the two bones. Such an arragement allowsÂ considerable movement. The synovial joints help in the locomotion and manyÂ other movements.

The different types of synovial joints are :

i.Â Ball and Socket -Â In this type of joint theÂ ball-shapped head of one bone articulates with cup-shaped cavity of another. ItÂ is found between n humerus and pectoralÂ girdle.

ii. Hinge joint jointÂ - In this type of joint -surface of one bone articulates with concave surface of another. It is found between the carpals.

iii. Saddle joint - Each boneÂ in a saddle joint resembles a saddle, with concave and convex portions that fit together. It is found between theÂ carpal and metacarpalÂ of thumb.

iv. Pivot joint. - This jointÂ consist of the rounded end of one bone fitting into a ring formed by the other bone. It is found between atlas and axis.

v. Gliding jointÂ - It is formed between bones that meet at flat or nearly flat articular surfacesÂ In this type of joint the Â  It is foundÂ between the carpalsÂ

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Total number of pair of ribs?

12
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What is gout ?

Gout is the inflammation of joints due to accumulation of uric acid crystals.Â
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how many pairs of floating ribs are present in humns?

2
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What is the rib cage made of ?

The thoracic vertebrae, ribs and sternum together form the rib cage.Â
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Which pairs are called false ribs?

8th, 9th and 10th pairs of ribs are called as false ribs or vertebrondral ribs.
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