Lecture10+full+notes

Lecture10+full+notes - Slide 1 Lecture 10: Parietal Lobe...

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Slide 1 Lecture 10: Parietal Lobe Read in “Phantoms”: Chapters 2,3, 6
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Slide 2 Review Questions 1) What are the physical boundaries of the parietal lobe? 2) Where is the primary somatosensory cortex located? 3) What is the main function of the parietal cortex? 4) What are the 2 functional zones of the parietal lobe? 5) Describe the connections of the parietal lobe. 7) Describe the pathways for incoming (afferent) sensory 8) What are the 2 ascending pathways for somatosensory information? What sensations does each “carry”?
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Slide 3 Parietal Lobe: Outline I. Neuroanatomy I. Functional zones II. Connections II. Somatosensation III. Functional theories IV. Effects of damage
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Slide 4 Parieto-occipital sulcus Cingulate gyrus Central sulcus Lateral (sylvian) fissure
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Slide 5 I. Functional Zones of Parietal Cortex Anterior zone : – Corresponds to postcentral gyrus – Concerned with somatosensory processing Posterior zone : – All areas between postcentral gyrus and parieto-occipital sulcus • referred to as posterior parietal ctx – Concerned with integrating somatosensory information in preparation for action
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Slide 6 Connections of the parietal lobe To cingulate gyrus White arrows: There are connections b/w the primary somatosensory ctx of the parietal lobe & the primary motor ctx of the frontal lobe (sensation translated into mechanical action). Red arrows: Connections also extend to the motor association ctx of the frontal lobe (guiding coordinated movement based on limb position). Yellow arrows: As you might imagine, there are many connections between the primary somatosensory ctx & the somatosensory association ctx (skin sensations, internal stimuli). Green arrows: represent the dorsal stream emerging from the occipital lobe (top; eye movement, perceiving motion); middle= control of spatially guided behavior; bottom= balance (coordination of auditory & visual information into balance) Black arrows: cingulate ctx (motivation)
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Slide 7 II. Somatosensation Three interactive somatosensory systems 1. Exteroceptive : Skin (i.e., cutaneous) 2. Proprioceptive (kinesthetic) : Body position 3. Interoceptive : Internal conditions (e.g., temperature, chemistry)
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Slide 8 Topography of cutaneous sensation • Dermatome : area of skin innervated by a single dorsal root nerve • Dermatomal map Going to quickly revisit this, because today we‟ll be discussing phantom limbs & so it is a useful map to keep in the back of your mind
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Slide 9 Somatic sensations ascend via spinal cord to the lateral portion of the ventral posterior nucleus (VPL)
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Slide 10 Dorsal-column medial-lemniscus pathway Anterolateral system (spino-thalamic tract) decussation sensation of contralateral side Ventral posterior Nucleus of thalamus Somatosensory cortex receives information from the contralateral side of the body Note that at the incoming level of the spinal cord, the spinothalamic tract crosses over to
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Lecture10+full+notes - Slide 1 Lecture 10: Parietal Lobe...

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