Spinal cord lesions part 1 (Brown Sequard Syndrome)#inicet #neetpg #mbbs #plab1 #usmle #neetpgprep

本站添加: 2026-06-07

[00:00:00]Imagine a patient who comes with a spinal cord injury and has complaints of loss of movement on the right half of the body and loss of sensation of pain and temperature in the left half of the body. For a young doctor, it might appear impossible at first glance, but yes, it is possible. But before going into the video, if you want more such videos related to neurology which would be helpful in your preparation for medical entrance examinations, then please do hit the like button and subscribe to my channel Neural Nudges.

[00:00:26]The syndrome where all these symptoms occur is Brown-Séquard syndrome. This occurs due to hemisection of the spinal cord. During hemisection of the spinal cord, all the ascending and the descending tracts of the spinal cord gets cut off on one side. If you want to learn in detail about the ascending and descending tracts of the spinal cord, then you can refer to my video on it, which I have posted the link here. Okay, first let's see the causes of Brown-Séquard syndrome. It occurs due to trauma, tumors, vascular causes, and degenerative or inflammatory causes. The common findings present in Brown-Séquard syndrome are ipsilateral UMN signs below the level of lesion. It occurs due to damage to corticospinal tract. And B, ipsilateral loss of tactile, vibration, proprioception sense below the level of lesion. This occurs due to damage to dorsal column. And C is ipsilateral LMN signs at the level of lesion as well as ipsilateral loss of sensation, which occurs due to damage of spinal nerves.

[00:01:28]And at the end there is contralateral loss of pain and temperature sensation below the level of lesion. This occurs due to damage to spinothalamic tract.

[00:01:36]But why does it occur contralaterally?

[00:01:38]You see, all of them are ipsilateral.

[00:01:40]It's because the spinothalamic tract fibers decussate at the upper levels of the spinal cord. That's the reason it presents contralaterally.