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Overview of Sensation & Sensory Pathways | 1st, 2nd & 3rd Order Neurons Explained скачать в хорошем качестве

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Overview of Sensation & Sensory Pathways | 1st, 2nd & 3rd Order Neurons Explained

For more cadaveric images and question banks, visit https://bootcamp.com/med-school Sensory processing is essential for localizing lesions and understanding clinical deficits. In this video, we explain how the 1st, 2nd, and 3rd order neurons relay information through the dorsal column and spinothalamic pathways. Learn why some lesions cause ipsilateral loss (dorsal column) while others cause contralateral deficits (spinothalamic). We also review the somatotopic organization of the sensory cortex and the thalamus as the sensory relay hub. What you’ll learn: 1. Five major sensory modalities: smell, vision, taste, hearing, touch 2. Role of the thalamus as the sensory relay center (except olfaction) 3. Somatotopic organization of the primary somatosensory cortex 4. Dorsal column: fasciculus gracilis & cuneatus (discriminative touch, vibration, proprioception) 5. Spinothalamic tract: pain, temperature & crude touch 6. How 1st, 2nd, and 3rd order neurons are arranged in each pathway 7. Clinical relevance: contralateral vs ipsilateral sensory loss By the end, you’ll understand how different sensory pathways are organized, where they decussate, and how lesions affect sensation. ⏱️ Timestamps 0:00 – Intro 0:22 – What is sensation? The 5 sensory modalities 0:47 – Smell (olfaction) → olfactory cortex (temporal lobe) 0:59 – Vision → primary visual cortex (occipital lobe) 1:16 – Taste (gustation) → gustatory cortex (insula) 1:29 – Hearing → primary auditory cortex (temporal lobe) 1:40 – Touch → primary somatosensory cortex (parietal lobe) 1:56 – Thalamus as the sensory relay center (exception: smell) 2:01 – Two major touch pathways: spinothalamic & dorsal column 2:24 – Spinothalamic tract → pain, temperature, crude touch 2:48 – Dorsal column pathway → discriminative touch, vibration, proprioception 3:14 – Two-point discrimination test explained 3:46 – Somatotopic organization of the somatosensory cortex 4:22 – Contralateral processing of sensory information 4:47 – Identifying sensory tracts in spinal cord cross-section 5:08 – Dorsal column: fasciculus gracilis vs fasciculus cuneatus 5:31 – Mnemonics: gracilis = lower limb, cuneatus = upper limb 6:15 – Spinothalamic tract anatomy (anterior & lateral) 6:55 – Spinocerebellar tracts overview (dorsal & ventral) 7:47 – Sensory pathways use 1st, 2nd & 3rd order neurons 8:18 – Example: dorsal column pathway (upper limb) 8:41 – 1st order neuron: dorsal root ganglion → medulla 9:03 – 2nd order neuron: medulla → decussation → thalamus 9:23 – Trigeminal ganglion exception for facial sensation 9:48 – Spinothalamic pathway neuron arrangement 10:06 – 3rd order neuron: thalamus → primary somatosensory cortex 10:30 – Wrap-up & summary This lesson is especially helpful for medical students, or anyone reviewing for anatomy exams. If it helps you out, give it a like, leave your questions in the comments, and subscribe for more Bootcamp videos. TikTok:   / medschoolbootcamp   INSTAGRAM:   / medschoolbootcamp   #medschoolbootcamp #medicine #Medical #MedStudent #MedicalStudent #MedSchool #MedicalSchool #Doctor #Resident #Hospital #MD #Med #Anatomy #Science #Whitecoat #WhiteCoatCeremony #MS1 #ms2 _____________________________________________________________________ sensation pathways, sensory pathways neuroanatomy, first order neuron, second order neuron, third order neuron, dorsal column pathway, spinothalamic pathway, sensory tracts explained, somatosensory cortex, thalamus sensory relay, discriminative touch, crude touch, pain and temperature pathway, vibration sense pathway, proprioception neuroanatomy, neuro exam sensory, neuroanatomy made easy, USMLE neuro review, NCLEX sensory pathways, spinal cord tracts

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