Name the type of joint between carpal/metacarpal of a thumb.

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Solution

Carpal/metacarpal of a thumb is joined by the saddle-shaped synovial joint. A synovial joint is a joint where one of the bones forming the joint is shaped like a saddle with the other bone resting on it like a rider on a horse. Saddle joints provide stability to the bones while providing more flexibility than a hinge or gliding joint.

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\begin{matrix} T y p e o f S y n o v i a l j o i n t & B o n e I n v o l v e d A . B a l l a n d s o c k e t & 1. C a r p a l a n d m e t a c a r p a l o f t h u m b B . H i n g e & 2. A t l a s a n d a x i s C . P i v o t & 3. F r o n t a l a n d p a r i e t a l D . S a d d l e & 4. K n e e 5. H u m e r u s a n d p e c t o r a l g i r d l e \end{matrix}

Which one of the following pair is incorrect?

(a) Hinge joint - between humerus and pectoral girdle

(b) Pivot joint - between atlas, axis occipital condyle

(d) Saddle joint - between carpel and metacarpals of thumb

\begin{matrix} T y p e o f S y n o v i a l j o i n t & B o n e I n v o l v e d A . B a l l a n d s o c k e t & 1. C a r p a l a n d m e t a c a r p a l o f t h u m b B . H i n g e & 2. A t l a s a n d a x i s C . P i v o t & 3. F r o n t a l a n d p a r i e t a l D . S a d d l e & 4. K n e e 5. H u m e r u s a n d p e c t o r a l g i r d l e \end{matrix}

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