Feb 10, 2023
The nervous system development is an important topic for the NEET PG exam because it is crucial for understanding the nervous system's anatomy, physiology and pathophysiology. Understanding the nervous system's development is vital for diagnosing and treating various neurological disorders and diseases.
In the context of the NEET PG exam, knowledge of the development of the nervous system is tested in both theoretical and applied aspects. Questions related to the development of the nervous system can be found in the anatomy, physiology, and neuroanatomy sections of the exam.
The exam also assesses the candidate's ability to apply this knowledge in diagnosing and managing neurological disorders.
Thus, an in-depth understanding of the development of the nervous system is critical for medical students and aspiring doctors for NEET PG Preparation.
Read this blog and get a quick overview of this high-yield topic.
The nervous system develops from the neural plate ectoderm.
At the dorsum of the baby, a plate develops called the Neural plate. Neural plate develops to form a neural groove, and later neural tube.
This neural plate ectoderm further develops to form a neural groove. This neural groove finally detaches from the dorsal surface and forms the neural tube. This neural tube forms the brain and spinal cord (central nervous system or CNS).
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Open Neural Tube Defects (ONTDs) are congenital anomalies that affect the central nervous system, specifically the brain and spinal cord. They occur when the neural tube, which normally closes during embryonic development to form the brain and spinal cord, does not close properly. This results in an opening in the neural tube, which can cause a range of neurological and developmental problems, depending on the size and location of the defect. Some common ONTDs include
Some common ONTDs include:
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It is the most common type. It is an asymptomatic condition, which is found incidentally and is not evident clinically. Patient might have a tuft of hair in the lumbo-sacral region, but nothing more evident. However, deep down there is a bifid spine. Although, the spine and the meninges are within the limits of the vertebra.
It is the least common type and occurs due to the non-closure of posterior neuro-pore in the lumbo-sacral region. Defect in lumbo-sacral region. Vertebra has not fused, spine is bifid. Skin is missing over the defect and there is leakage of CSF.
A cyst is seen in the lumbo-sacral region which only has protrusion of meninges. Spine is still present within the limits of the vertebra. It is covered by the skin.
A cyst is seen in the lumbo-sacral region with protrusion of meninges and some neural tissue. Spine is outside and lies in the cyst. It is covered by the skin.
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Fetal Veins, Portal vein formation, Derivatives of the embryonic veins - NEET PG Anatomy
Ventricles are open spaces within the CNS that contain the CSF. CSF is the ultrafiltrate of blood, secreted by the choroid plexus.
Cerebral aqueduct of Sylvius
Thalamus is the axis around which the various structures are becoming C-shaped. These structures are:
It is the 1st commission to develop and connect the right and left side of the brain. For example, the olfactory bulb of the two sides are connected via the anterior commissure.
It is the 2nd commission to develop and is a C-shaped collection of axons. It connects the hippocampus (in the temporal lobe) on either side with each other.
It is the 3rd commissure to develop and connects the right side of the cerebral lobes to the left side of the cerebral lobes.
Hope this blog was insightful. Stay tuned and we’ll keep bringing more such medical notes blog on all the high-yield topics for NEET PG/NExT exam to elevate your preparations.
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