Total no of vertebrae in thoracic region is?

Appeared in: NCL (MP) Nursing Officer - 2020

Explanation

The thoracic region of the spine is composed of 12 vertebrae, numbered T1 to T12.
This number corresponds directly to the 12 pairs of ribs in the human body, as each thoracic vertebra articulates with a pair of ribs.
The structure of the thoracic spine is less flexible than the cervical or lumbar regions but provides crucial protection for the organs in the chest cavity.

Option B: 14 is an incorrect count for any of the mobile sections of the vertebral column.
Option C: There are 5 vertebrae in the lumbar region (L1-L5), not the thoracic region. The sacrum also consists of 5 fused vertebrae.
Option D: There are 7 vertebrae in the cervical region (C1-C7), which is located in the neck.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the vertebral column as background academic context rather than a clinical decision trigger.
Knowing the number of thoracic vertebrae is fundamental for nurses to accurately locate anatomical landmarks. For example, identifying intercostal spaces for chest auscultation, placing ECG electrodes, or assisting with procedures like thoracentesis or chest tube insertion relies on counting ribs, which are anchored to the thoracic vertebrae.
Pain or injury in the thoracic region can affect breathing and organ function due to its connection with the rib cage and the vital organs it protects.
What if? If a patient has a 'cervical rib' (an extra rib arising from the 7th cervical vertebra), it can cause thoracic outlet syndrome by compressing nerves and blood vessels. A nurse's assessment might reveal pain, numbness, or weakness in the arm on the affected side.

How to Approach the Question

Identify the key term in the question: 'thoracic region'.
Recall the basic anatomy of the human vertebral column and its five sections.
Mentally list or visualize the number of vertebrae in each section: Cervical (7), Thoracic (12), Lumbar (5), Sacral (5 fused), Coccygeal (4 fused).
Match the term 'thoracic' with its corresponding number, which is 12.
Select the option that matches this number.

Concept Tested & Keywords

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E6 Anatomy Grays 43e Vol 2 Part 2 p. 15-17

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