Lecture 20 somatosensory

Lecture 20 somatosensory - Some mechanosensory neurons...

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Unformatted text preview: Some mechanosensory neurons respond to an increment in pressure by giving a brief response (rapidly adapting), others adapt slowly Anatomy of muscle stretch receptor (also called muscle spindle). Reflex and Cerebellar Channels medulla Somatosensory Lemniscal Channel Somatosensory cortex spinal cord hand region foot region . Cortex . Dorsal root ganglia pons cerebellum midbrain hypothalamus thalamus Pituitary gland Olfactory bulb Lemniscus: Latin for ribbon. Lemniscal pathways are long and ribbon- like. Dermatomes: the region of skin innervated by each spinal nerve Trigeminal nerve is one of the 12 cranial nerves. Lemniscal pathway: crosses in medulla Dorsal root ganglion * Pain and temperature information run in a different pathway. The spinothalamic pathway crosses in the spinal cord, the leminscal pathways does not To brain Lemniscal To brain Spino-thalamic The spinothalamic pathway crosses in the spinal cord, the leminscal pathways does not To brain Lemniscal To brain Spino-thalamic Dissociated sensory loss following spinal hemisection Spinal cord thalamus Somatosensory cortex medulla Dorsal root ganglion Two point discrimination threshold BO...
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Lecture 20 somatosensory - Some mechanosensory neurons...

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