Free Thorax practice for NEET PG and INI-CET Anatomy, with a written explanation on every question.
6 questions · Free explanations
Showing 1–6 of 6 questions
Q1 · Thoracic Duct
EasyExplanation
The thoracic duct ascends from the cisterna chyli, crosses to the left at about the level of T5, and empties at the junction of the left internal jugular and left subclavian veins. It therefore drains the whole body except the right upper limb and the right side of the head, neck and thorax. That remaining territory drains through the right lymphatic duct on the opposite side.
Q2 · Lymphatics
MediumExplanation
The right lymphatic duct drains only the right upper limb and the right half of the head, neck and thorax. Everything below the diaphragm, including both lower limbs, drains into the cisterna chyli and then the thoracic duct. The common error is to assume that a right-sided structure must use the right duct, which holds only above the diaphragm.
Q3 · Coronary Circulation
EasyExplanation
The left anterior descending artery runs in the anterior interventricular groove and gives septal perforators to the anterior two thirds of the septum. It also supplies the anterior wall of the left ventricle and the apex, which is why its occlusion is the most consequential coronary lesion. The posterior third of the septum comes from the posterior interventricular artery.
Q4 · Coronary Circulation
MediumExplanation
The sinuatrial nodal artery arises from the right coronary artery in about 60 per cent of hearts and from the circumflex in the remainder. The atrioventricular node is likewise usually right coronary territory, supplied at the crux of the heart. This is why an inferior infarct from right coronary occlusion so often produces bradycardia and heart block.
Q5 · Coronary Circulation
HardExplanation
Roughly 85 per cent of hearts are right dominant, meaning the posterior interventricular artery arises from the right coronary artery. About 8 per cent are left dominant, with the branch coming from the circumflex, and the remainder are codominant. Dominance matters because it determines which vessel supplies the inferior wall and the atrioventricular node.
Q6 · Mediastinum
HardExplanation
The azygos vein arches forward over the right lung root at about the level of the sternal angle, which corresponds to the T4 and T5 disc. The same plane marks the start and end of the aortic arch, the bifurcation of the trachea and the division between superior and inferior mediastinum. Grouping these landmarks at one level is far more efficient than memorising them separately.
Thorax sits within Anatomy, which carries the same syllabus in both exams. This set runs to 6 questions, each tagged Easy, Medium or Hard, 2 of them at Hard.
Answer first, then read the explanation even on the ones you got right — the reasoning is where Thorax marks are actually won, and it is what separates a recalled fact from a question you can solve in a new form. Once the Easy set feels comfortable, filter to Hard to find the gaps Anatomy examiners keep returning to.
FAQ
Yes. Every question and explanation in this Thorax set is free and open — no login, no form and no payment. The explanation appears the moment you answer.
Thorax sits within Anatomy, which appears in the same form in both syllabuses. Gross anatomy, neuroanatomy, embryology and histology, the four areas NEET PG returns to every year. Nerve injuries, foramina and blood supply carry most of the marks.
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