INI-CET EXAM -2025
Applied Anatomy
Easy
Marked structure separates which of the following:
Appeared in: INI-CET EXAM -2025
Explanation
- The image shows a sagittal section of the brain, and the yellow arrow points to the septum pellucidum.
- The septum pellucidum is a thin, vertical membrane located in the midline of the brain.
- Its primary anatomical function is to act as a partition separating the anterior horns of the left and right lateral ventricles.
Why Other Options Were Wrong
- Option A: The third ventricle is a single, midline cavity located inferior to the fornix and between the two thalami. It is not separated by the septum pellucidum.
- Option C: The fourth ventricle is located much lower in the brain, within the brainstem (between the pons and medulla) and anterior to the cerebellum. It is anatomically distant from the septum pellucidum.
- Option D: The cisterna magna is not a ventricle but one of the largest subarachnoid cisterns, located between the cerebellum and the medulla oblongata. It is filled with cerebrospinal fluid but is outside the ventricular system proper.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the brain's ventricular system as background academic context rather than a clinical decision trigger.
- The septum pellucidum is an important landmark in neuroimaging (MRI, CT scans) to assess the midline structures of the brain and identify any shifts or abnormalities.
- A 'cavum septi pellucidi' (CSP) is a normal variant where the two leaflets of the septum pellucidum are separated, creating a small cavity. While often benign and asymptomatic, a large CSP can be associated with other developmental anomalies or, rarely, cause symptoms.
- What if? - If the septum pellucidum were absent (a condition called septo-optic dysplasia), the lateral ventricles would appear as a single, continuous cavity on imaging, and this finding is often associated with visual impairment and hormonal deficiencies due to underdeveloped optic nerves and pituitary gland.
How to Approach the Question
- First, identify the view of the anatomical specimen. This is a sagittal (midline) view of the brain.
- Next, orient yourself by identifying major, easily recognizable structures. You can see the cerebrum with its gyri and sulci, the large C-shaped corpus callosum, and the cerebellum at the back.
- Identify the specific structure indicated by the arrow. The arrow points to a thin membrane located directly underneath the body of the corpus callosum.
- Recall the name and function of this structure. This is the septum pellucidum.
- Evaluate the given options based on your anatomical knowledge. The septum pellucidum is known to be the partition between the two lateral ventricles.
- Select the option that correctly identifies what the septum pellucidum separates.
Concept Tested & Keywords
- Concept Tested: Anatomy of the brain's ventricular system
- Stem keywords: Marked structure, brain, separates
- Lead-in keywords: which of the following
- Clinical cues: Sagittal view of a human brain specimen
Question ID
Q3w5HRRyWRxfjLrIxI4ugi
Reference Book
E6 Anatomy Grays 43e Vol 1 Part 3 p. 41-43
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 207-209
Practise the full INI-CET EXAM -2025
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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