Which one of the following option is incorrect ?

Options

A. Hingejoint - between Humerus and pectroal girdle
B. Pivot joint - betwwen atlas and axis
C. Gliding joint - between the carpals
D. Saddle joint - between carpal and metacarpals or thumb

Answer

To determine which option is incorrect regarding the types of joints, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option - Hinge joint between humerus and pectoral girdle
- A hinge joint allows movement in one direction, similar to a door hinge.
- Common examples of hinge joints include those found in the fingers, toes, elbows, and knees.
- The joint between the humerus (upper arm bone) and the pectoral girdle (shoulder area) is not a hinge joint; it is a ball-and-socket joint.
- Therefore, this option is incorrect.

### Step 2: Analyze the second option - Pivot joint between atlas and axis
- A pivot joint allows rotational movement, where the rounded end of one bone fits into a ring formed by another bone.
- The atlas (first cervical vertebra) and axis (second cervical vertebra) form a pivot joint that allows the head to rotate.
- This option is correct.

### Step 3: Analyze the third option - Gliding joint between carpals
- Gliding joints allow bones to slide over one another in a single plane.
- The carpals are the small bones in the wrist that articulate with each other, allowing gliding movements.
- This option is correct.

### Step 4: Analyze the fourth option - Saddle joint between carpal and metacarpals of the thumb
- A saddle joint allows for a greater range of motion than a hinge or gliding joint and is shaped like a saddle.
- The joint between the carpal bone (specifically the trapezium) and the metacarpal of the thumb is indeed a saddle joint.
- This option is correct.

### Conclusion
The incorrect option is the first one: **Hinge joint between humerus and pectoral girdle**.