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 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.
It is also known as corticobulbar tract. It crosses the midline at the level of motor nuclei in the brainstem. The cranial nerves go beyond the brainstem and control the skeletal muscles. Cerebrum controls the contralateral side of the body.
Muscles with only contralateral innervation:
Medial Pons Syndrome
This is due to a lesion in the pons. In this the Ipsilateral abducens nerve (C.N. VI) palsy occurs Causes medial squint and Contralateral spastic paralysis.
Medial Medullary Syndrome
This condition occurs when there is a lesion in the medulla leading to Ipsilateral hypoglossal nerve (C.N. XII) palsy Causing ipsilateral tongue palsy and Contralateral spastic paralysis.
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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