Where are a number of immoveable joints?
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Immovable joints (called synarthroses) include skull sutures, the articulations between the teeth and the mandible, and the joint found between the first pair of ribs and the sternum. OK The adult human skeletal system has a complex architecture that includes 206 named bones connected by cartilage, tendons, ligaments, and three types of joints: synarthroses (immovable)

There are three types of immovable joints: sutures, syndesmosis, and gomphosis.

Sutures: These narrow fibrous joints connect bones of the skull (excluding the jaw bone). ...

Syndesmosis: This type of fibrous joint connects two bones that are relatively far apart.