1. Physiology of the sensory system

2. Two-point discrimination
Number receptors / area
(receptive field of the receptor )

3. Text Fig. 17-3
Smaller the receptive fields, greater the density of receptors. This relationship allows for greater discrimination in sensory inputs.

4. Two-point discrimination
Number receptors / area
Pathway arrangement

6. The Spinal Nerve
Text Fig. 9-6, Anatomical Orientation

7. Sensations modalities
Fast
Slow
2-point discrimination
Vibration
Prorioception
Crud touch (itch & rub)
Temperature
Pain
Posterior Column-Medial lemniscus
Pathway
(PCML)

8. Sensations modalities
Fast
Slow
2-point discrimination
Vibration
Prorioception
Temperature
Crud touch (itch & rub)
Pain
Antero-lateral system (ALS)
Other name: Spinothalamic pathway

9. Sensations modalities
Fast
Slow
2-point discrimination
Vibration
Prorioception
Temperature
Crud touch (itch & rub)
Pain
Posterior Column-Medial lemniscus
Pathway
(PCML)
Antero-lateral system (ALS)
Other name: Spinothalamic pathway
Pressure ??????

10. Posterior Column-Medial lemniscus Pathway (PCML)

14. Ascending and Descending Tracts of the Spinal Cord
Cervical
Extremity (UE)
Thoracic
Lumbar
Extremity (LE)

15. PCML Pathway

16. PCML Pathway

17. PCML Pathway

18. Lumbar Levels

19. Thoracic Levels

20. Cervical Levels

21. MRI of PCML

22. MRI of PCML

23. Somatotopic organization of (PCML)

26. PCML Function
2-point discrimination
Vibration
Prorioception

27. PCML Function STEREOGNOSIS 2-point discrimination Vibration
Prorioception
STEREOGNOSIS

28. PCML Function STEREOGNOSIS GRAPHESTHESIA 2-point discrimination
Vibration
Prorioception
STEREOGNOSIS
GRAPHESTHESIA

29. PCML Function STEREOGNOSIS GRAPHESTHESIA
2-point discrimination
Vibration
Prorioception
STEREOGNOSIS
GRAPHESTHESIA
Help in movement and Wight recognition

30. PCML lesion associated symptoms
Loss of 2-point discrimination sensation
loss of Vibration sensation
Loss Prorioception sensation

31. PCML lesion associated symptoms
Loss of 2-point discrimination sensation
loss of Vibration sensation
Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA

32. PCML lesion associated symptoms
Loss of 2-point discrimination sensation
loss of Vibration sensation
Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA
AGRAPHESTHESIA
ABAROGNOSIS
SENSORY ATAXIA

33. PCML lesion associated symptoms
Loss of 2-point discrimination sensation
loss of Vibration sensation
Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA
AGRAPHESTHESIA
ABAROGNOSIS
SENSORY ATAXIA

34. PCML lesion associated symptoms
Loss of 2-point discrimination sensation
loss of Vibration sensation
Loss Prorioception sensation
ASTEREOGNOSIS / STEREOGNOSIA
AGRAPHESTHESIA
ABAROGNOSIS
SENSORY ATAXIA

35. Case Study

36. Case Study

37. Antero-lateral system (ALS)

38. Sensations modalities
Fast
Slow
2-point discrimination
Vibration
Prorioception
Temperature
Crud touch (itch & rub)
Pain
Antero-lateral system (ALS)
Other name: Spinothalamic pathway

41. Text Fig. 18-9

42. Syringomyelia and the
ALS
Spinal cord
Hemisection and
the ALS

43. The ALS in the Spinal Cord, Medulla and Pons
Atlas Fig. 8-7A

44. Text Fig

45. The ALS in the Midbrain, Thalamus and Cerebral Hemisphere
Atlas Fig. 8-7A

46. Dermatomes

47. Dermatomes

49. Dermatomes

50. Dermatomes

51. Dermatomes

52. Dermatomes Shoulder (C5-C6)
Hand (C6-C8): 6= thumb the, 7= index finger, 8= small finger
Nipple (T4),
Umbilicus (T10),
Inguinal region (T12-L1),
Along the pelvic rim L1
knee (L3, L4),
The big toe (L4-L5)
The genitalia and anus (S4 and S5)

53. Visceral sensory & referred pain

54. Visceral sensory & referred pain

55. Visceral sensory & referred pain

56. Visceral sensory & referred pain

57. Referred pain
right
Left
liver

58. Visceral sensory & referred pain

59. Visceral sensory & referred pain