Which of the following is an example of synarthrosis joint?

Appeared in: AIIMS Patna NO - 2020

Explanation

Synarthrosis joints are functionally classified as immovable joints.
The bones in these joints are tightly bound by fibrous connective tissue, offering stability and protection.
The sutures of the skull are the primary example of synarthrosis, where the bones interlock to form a rigid case for the brain.

Option B: The wrist joint is a condyloid synovial joint, which is a type of diarthrosis, meaning it is freely movable.
Option C: The hip joint is a ball-and-socket synovial joint, a type of diarthrosis that allows for a wide range of motion (multiaxial).
Option D: The elbow joint is a hinge-type synovial joint, which is a diarthrosis, allowing for free movement (flexion and extension).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Functional classification of joints as background academic context rather than a clinical decision trigger.
Understanding joint classification is fundamental for assessing musculoskeletal conditions and patient mobility.
In infants, the skull sutures are not yet fused and are known as fontanelles. This allows the skull to change shape during birth and accommodates rapid brain growth. A nurse assesses fontanelles for signs of dehydration or increased intracranial pressure.
What if? If a child's cranial sutures fuse prematurely, the condition is called craniosynostosis. This can restrict brain growth and lead to an abnormal head shape, requiring surgical intervention to correct.

How to Approach the Question

First, identify the key term in the question stem: 'synarthrosis joint'.
Recall the functional classification of joints, which categorizes them by their degree of mobility.
The three functional classes are: synarthrosis (immovable), amphiarthrosis (slightly movable), and diarthrosis (freely movable).
Evaluate each option based on its movement capability.
Recognize that the wrist, hip, and elbow joints are all freely movable joints (diarthroses) used for limb movement.
Conclude that the fibrous joints of the skull sutures, which are fixed and immovable, are the correct example of a synarthrosis joint.

Concept Tested & Keywords

Q2ZBnBF2mKSE9Bb7yLjqaW

E6 Osteology InderbirSingh 5e pp. 21-23, 22-24

E6 Nursing Fundamentals Taylor p. 306-308

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Attempt every question from this paper in a timed mock, then review the full solution for each one.