Which one of the following is not a synovial joint?

A

Ball and socket joint

B

Pivot joint

C

Sutures forming the cranium

D

Hinge joint

Dear student 

Joints are points of contact between bones, or between bones and cartilages.
A suture is a type of fibrous joint that is only found in the skull(cranial bones+facial bones). 
Sutural joints are present between cranial bones of the skull.
Hence sutures forming cranium is not a synovial joint.It is a fibrous joint.
So, the correct answer is 'Sutures forming cranium'.

Joints are points of contact between bones, or between bones and cartilages.
A suture is a type of fibrous joint that is only found in the skull(cranial bones+facial bones). 
Sutural joints are present between cranial bones of the skull.
Hence sutures forming cranium is not a synovial joint.It is a fibrous joint.
So, the correct answer is 'Sutures forming cranium'.