The number of thoracic vertebrae is -

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2023

Explanation

The human spine has 12 thoracic vertebrae, designated T1 through T12.
These vertebrae are located in the mid-back, situated between the cervical (neck) and lumbar (lower back) regions.
A key characteristic of thoracic vertebrae is that each articulates with a pair of ribs, forming the posterior anchor of the thoracic cage, which protects vital organs like the heart and lungs.

Option A: This is the number of cervical vertebrae (C1-C7), which are located in the neck.
Option C: This is the number of lumbar vertebrae (L1-L5) in the lower back. It is also the number of sacral vertebrae before they fuse to form the sacrum.
Option D: This represents the total number of individual, movable vertebrae in the spine, which includes 7 cervical, 12 thoracic, and 5 lumbar vertebrae (7 + 12 + 5 = 24).

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.
Knowledge of vertebral regions is crucial for nurses to accurately document the location of pain (e.g., 'pain at T7 level'), assess for spinal injuries, and assist with procedures like epidural catheter placement.
Injuries to the thoracic spine (T1-T12) can result in paraplegia, affecting the trunk and legs, and may also impair breathing due to the thoracic vertebrae's connection with the rib cage.
What if? If a patient is diagnosed with scoliosis, the abnormal curvature most commonly occurs in the thoracic spine. A nurse's assessment would involve checking for asymmetry in the shoulders, waist, or hips, which is a direct application of understanding this spinal region's anatomy.

How to Approach the Question

This is a factual recall question testing fundamental knowledge of human anatomy.
First, identify the specific anatomical structure mentioned in the question: 'thoracic vertebrae'.
Recall the five distinct regions of the vertebral column: Cervical, Thoracic, Lumbar, Sacral, and Coccyx.
Associate the correct number of vertebrae with each region. A helpful mnemonic is 'Breakfast at 7 (Cervical), Lunch at 12 (Thoracic), Dinner at 5 (Lumbar)'.
Based on this mnemonic or direct recall, select the number corresponding to the thoracic region, which is 12.
Briefly consider the other options to confirm they correspond to different vertebral counts (7 for cervical, 5 for lumbar, 24 for total movable).

Concept Tested & Keywords

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

Practise the full RUHS, Jaipur, PB B.Sc Nursing Entrance-2023

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