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Nervous System: IV

Nervous System: IV. Somatic Sensory Reflexes Neural Integration ANS. Nervous System Design. Sensory Receptors in PNS Somatic: Tactile, Nocireceptors, Proprioceptors, Baroreceptors Special: Photoreceptors, Mechanoreceptors, Chemoreceptors CNS Spinal Cord Brainstem Cerebellum Thalamus

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Nervous System: IV

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  1. Nervous System: IV Somatic Sensory Reflexes Neural Integration ANS

  2. Nervous System Design • Sensory Receptors in PNS • Somatic: Tactile, Nocireceptors, Proprioceptors, Baroreceptors • Special: Photoreceptors, Mechanoreceptors, Chemoreceptors • CNS • Spinal Cord • Brainstem • Cerebellum • Thalamus • Cerebral Cortex • Motor Effectors • Somatic Motor • Autonomic Motor

  3. Sensory Overview

  4. CN: Special and Somatic Sensory

  5. Somatic Sensory: Skin

  6. Somatic Sensory: Proprioception

  7. Dermatomes

  8. Stretch Receptors

  9. Golgi Tendon Organ

  10. Intrafusal Fibers

  11. Somatic Reflex Arc

  12. Motor Response Neuromuscular Junction

  13. Motor End Plate

  14. Patellar Reflex: Monosynaptic

  15. Polysynaptic Reflexes

  16. Somatic Reflex Tests

  17. Spinal Cord and Spinal Nerves

  18. PNS  CNS for somatic sensory

  19. Spinal Cord Gray and White Matter

  20. Spinal Cord Histology Areas

  21. Spinal Tract Names

  22. Organization of Spinal Cord Segment

  23. Spinal Tract Locations

  24. Dorsal Column – Medial Lemniscus Localized touch Gradations of touch Vibratory sensations Proprioception Pressure sensations Fasciculus Cunneatus Upper Limbs Upper Trunk Neck Fasciculus Gracilis Lower limbs Inferior trunk Ascending Tracts: Specific

  25. Ascending Tracts

  26. Dorsal White Columns

  27. Anterolateral System Pain Temperature Crude touch Crude pressure Tickle / Itch Sexual sensations Spinothalamic tract Lateral Pain Temperature Anterior Crude Touch Crude Pressure Ascending Tracts: Nonspecific

  28. Spinothalamic Tracts

  29. Localization of information: Spinal Nerve Input to Spinothalamic tract

  30. Spinocerebellar Pathways • Posterior Cerebellar • Trunk, lower limb proprioceptors • Tendon stretch • Ascend on same side to inferior cerebellar peduncle • Anterior Cerebellar • Trunk, lower limb proprioceptors • Tendon stretch • Ascend and cross twice to anterior cerebellar peduncle

  31. Spinocerebellar Tracts

  32. Somatosensory Reflexes

  33. Direct / Pyramidal Skeletal voluntary motor Corticobulbar CN motor Corticospinal Lateral Cross in medulla Anterior Cross in spinal cord Indirect / Extrapyramidal Tectospinal Coordinate reflexes to visual and auditory stimulus Vestibulospinal Muscle tone to extensors Posture and balance Rubrospinal Muscle tone to flexors Reticulospinal (A, M, L) Visceral motor tone Visceral motor functions Visceral reflexes Descending Motor Tracts

  34. Descending Motor Tract Locations

  35. Ventral White Matter Ventral White Axons leaving Gray Matter

  36. Descending Motor Tract Functions

  37. Corticospinal Tract Location

  38. Corticospinal General Descending Pathway

  39. Descending Somatic Pathway

  40. Extra Pyramidal Tracts

  41. Motor Tracts Compared

  42. Basal Nuclei • Adjust movement • Preparation • Coordinate • Rhythmic Cycles • Subconscious control • Alter motor commands • Communication • In • Caudate • Putamen • Out • Globus Pallidus • Thalamus

  43. Basal Nuclei Afferents Caudate and Putamen

  44. Basal Nuclei Efferents Globus pallidus to Thalamus

  45. Basal Nuclei Regulation Summary

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