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DERMATOME.pptx
1. DERMATOME
Shamima Akter
B. Sc (Honors) in Occupational Therapy
& M. Sc in Rehabilitation Science
Assistant Professor,
Department of Occupational Therapy
Bangladesh Health Professions Institute (BHPI)
Centre for the Rehabilitation of the Paralysed (CRP)
Chapain, Savar
2. DERMATOME
• This term refers to the area of the skin
innervated by the sensory axons within each
segmental nerve (root).
• There are 28 points to test dermatome
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5. • C5= lateral side of
antecubital fossa
• C6= proximal phalanx
of the thumb
• C7= proximal phalanx
of the middle finger
• C8= proximal phalanx
of the little finger
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6. T1= medial epicondyle
T2= apex of axilla
T3= At the midclavicular line and the third intercostal space
T4= located at the level of the nipples
T5= At the midclavicular line and the fifth intercostal space
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7. T6= At the midclavicular line, located at
the level of the xiphisternum.
T7= At the midclavicular line, one
quarter the distance between the
level of the xiphisternum and the
level of the umbilicus
T8= At the midclavicular line, one half
the distance between the level of
the xiphisternum and the level of
the umbilicus
T9= At the midclavicular line, three
quarters of the distance between
the level of the xiphisternum and
the level of the umbilicus
T10= At the midclavicular line, located
at the level of the umbilicus.
T11= At the midclavicular line, midway
between the level of the umbilicus
and the inguinal ligament.
T12= At the midclavicular line, over the
midpoint of the inguinal ligament
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8. • L1= Midway
between the key
sensory points for
T12 and L2.
• L2= On the
anterior-medial
thigh
• L3= At the medial
femoral condyle
above the knee
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9. • L4= Over the
medial malleolus
• L5= On the dorsum
of the foot at the
third metatarsal
phalangeal joint.
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10. • S1= On the lateral
aspect of the
calcaneus
• S2= At the
midpoint of the
popliteal fossa
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11. • S3 Over the ischial
tuberosity or
infragluteal fold
(depending on the
patient their skin
can move up, down
or laterally over the
ischii).
• S4/5= In the
perianal area, less
than one cm lateral
to the
mucocutaneous
junction
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17. PIN PRICK SENSORY TEST
Measurement
It measures discrimination of sharp and dull stimuli, which indicates
protective sensation.
Test instrument
New or sterilized safety pin
Stimulus
Randomly apply sharp and blunt ends of the safety pin,
perpendicular to skin, at pressure necessary to elicit correct
response on uninvolved side of body.
Response
Patient says “sharp” or dull after each stimulus.
Scoring
Score is number of correct responses divided by number of stimuli.
Expected score is 100%. Correct responses to sharp stimuli indicate
intact protective sensation; incorrect responses to sharp stimuli
indicate some awareness of pressure but absent protective
sensation.
0= absent, 1= altered, 2= normal, NT= not testable
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18. LIGHT TOUCH SENSORY TEST
Light touch is perceived by receptors in the superficial skin. Light touch
is important for fine discriminatory hand use.
Test instrument
Monofilaments
Stimulus
Apply the monofilament for 1 to 1.5 seconds at the pressure needed to
bow the monofilament.
Response
The client says ‘touch’ when he feels the monofilament.
Scoring
The client responds to at least one of the three application of the
monofilament
0= absent
1= altered
2= normal
NT= not testable
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