Which type of synovial joint allows rotational movement around a single central axis, as seen between the first two cervical vertebrae (atlas and axis)?

Answer and explanation

Correct answer: A. Pivot joint

  1. Step 1: Synovial joints are characterized by a fluid-filled synovial cavity between articulating bones, providing extensive mobility.
  2. Step 2: In a pivot joint (trochoid joint), a cylindrical bony projection rotates within a ring formed by another bone and an enclosing ligament.
  3. Step 3: The atlanto-axial joint between the atlas () and the odontoid process (dens) of the axis () is a classic pivot joint that allows head rotation ('no' movement).
Answer
Pivot joint
Why not the others: 'Hinge joint' permits angular motion primarily in one plane, like a door (e.g., elbow, knee, interphalangeal joints); 'Ball and socket joint' provides multi-axial rotational freedom (e.g., shoulder, hip); 'Saddle joint' features complementary concave-convex articulating surfaces (e.g., between carpal and metacarpal of human thumb).

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