Shoulder blades, skull, sternum and ribs are made up of?

IGNOU Post B. SC. Nursing entrance -2021

Applied Anatomy

Easy

Appeared in: IGNOU Post B. SC. Nursing entrance -2021

Explanation

The bones listed—shoulder blades (scapulae), skull bones, sternum, and ribs—are all classified as flat bones due to their thin, flattened, and often curved shape.
Their primary function is to protect vital internal organs, such as the brain (skull), heart, and lungs (sternum and ribs).
They also provide extensive surface areas for the attachment of muscles, which is a key function of the scapula.

Option A: Short bones are typically cube-shaped and are found in areas requiring stability and support with limited motion, which is not the primary characteristic of the bones listed.
Option B: Sesamoid bones are small, seed-like bones that are embedded within tendons to protect them from stress and wear. This description does not match the large, plate-like structure of the skull, ribs, sternum, or scapula.
Option C: Irregular bones have complex and varied shapes that do not fit into the other categories. While the skull does contain some irregular bones (e.g., facial bones), the major cranial plates, sternum, ribs, and scapula are uniformly classified as flat.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of bones based on their shape and function as background academic context rather than a clinical decision trigger.
Understanding bone classification is crucial for nurses when assessing injuries. A fracture of a flat bone like a rib or sternum can suggest potential injury to underlying vital organs like the lungs or heart.
Flat bones, particularly the sternum, ribs, and pelvic bones, contain a significant amount of red bone marrow, making them primary sites for hematopoiesis (blood cell formation) throughout life. They are common sites for bone marrow biopsy.
What if? If a patient has a fractured rib, the primary nursing concern is not just the bone itself, but managing pain to ensure adequate breathing. Poor pain control can lead to shallow breathing (atelectasis) and increase the risk of pneumonia.

How to Approach the Question

This is a factual recall question from the subject of anatomy.
First, carefully read the list of bones provided in the question: shoulder blades (scapulae), skull, sternum, and ribs.
Recall the general shape and primary function of these bones. They are generally thin and plate-like, and they serve to protect vital organs or provide a wide area for muscles to attach.
Next, review the definitions of the bone types given in the options.
Compare the characteristics of the listed bones with the definitions. 'Flat bone' is the category that describes thin, flattened, protective bones.
Conclude that all the bones mentioned fit the description of flat bones, making it the correct answer.

Concept Tested & Keywords

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E6 Physiology Ganong 27e Vol 2 Part 3 pp. 14-16, 18-20

E6 Anatomy Applied Ashalatha 4e p. 253-255