Feb 14, 2023
The transverse section of the midbrain is considered an important topic for the NEET PG exam because of its anatomical significance. A thorough understanding of its transverse section helps in visualizing the complex arrangement of various structures and their relationships.
Furthermore, the NEET PG exam assesses the candidate's understanding of human anatomy, including the central nervous system. The transverse section of the midbrain is one of the important topics covered in the syllabus, and a sound understanding of this topic can contribute significantly to your overall performance.
In this blog, we have covered this high-yield anatomy topic briefly from the NEET PG/NExT exam preparation point of view. Keep reading.
Transverse section of the midbrain is taken at the level of the superior colliculus. C.N. III nucleus is seen anterior to the cerebral aqueduct of Sylvius in the periaqueductal grey matter. C.N. III (LMN) exits from the anterior midbrain. If the anterior midbrain is damaged, it damages the C.N. III → Causing ipsilateral down & out eye with wide fixed pupils.
Also Read: Development of the Nervous System - NEET PG Anatomy
Muscles with only contralateral innervation:
Lateral pterygoid muscle (Supplied by contralateral C.N. V)Lower face muscles (supplied by contralateral C.N. VII)Genioglossus muscle (supplied by contralateral C.N. XII)
Also read: How to Prepare Anatomy for PG Entrace Exams ?
In lateral brainstem lesions, the pyramidal tract is not affected. Therefore, there is no contralateral spastic paralysis. Rather, these patients have contralateral loss of pain & temperature sensations, due to involvement of the spinothalamic tract.
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To study this topic in more detail, head over to the PrepLadder app and get to learn from engaging video lectures and comprehensive notes. You will get access to excellent study resources curated to strengthen your NEET PG/NExT exam preparations.
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