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method of physical examination of central nervous system
1. METHOD OF PHYSICAL EXAMINATION OF
CENTRAL NERVOUS SYSTEM
(SUPERFICIAL AND DEEP TENDON REFLEX)
By
DR.KAUSHAL SINHA
1st year PG Scholar
Dept of Panchakarma
SDM COLLEGE OF AYURVED &HOSPITAL
HASSAN
1
3. AN INTRODUCTION TO REFLEX
Reflexes are automatic, subconscious response
to changes within or outside the body.
Reflexes maintain homeostasis (autonomic
reflexes) – heart rate, breathing rate, blood
pressure, and digestion.
Reflexes also carry out the automatic action of
swallowing, sneezing, coughing, and vomiting..
Reflexes maintain balance & posture.
3
4. DEFINITION
A reflex may be defined as an immediate and
involuntary response to a stimulus.
A reflex is a fast response to a change in the
body's internal or external environment in an
attempt to restore homeostasis.
4
5. COMPONENT OF REFLEX
5
5 Components of Reflex
1.Arrival of stimulus
and activation of
receptor
2.Activation of sensory
neuron
3.Information
processing
4.Activation of motor
neuron
5.Response by effector
7. EXAMINATION TECHNIQUE
Introduce yourself to the patient
The patient should be relaxed.
Explain to the patient the examination technique.
After obtaining the reflex on one side, always go
immediately to the opposite side for the same reflex
so that you can compare them.
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9. SUPERFICIAL REFLEX
It is a polysynaptic reflex and elicited by cutaneous
stimulation
Are usually involving moving away from receptor
They do not depend on muscle stretch receptor
The abdominal reflex and planter are particularly
important
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10. 1.CORNEAL REFLEX
Nerve segment
Afferent(sensory) : V
(Trigeminal nerve)
Centre : Pons
Efferent(motor) : VII (Facial
nerve)
10
11. TECHNIQUE :-
Take a wisp of cotton
Ask the patient look in
opposite direction
Gently brush the cotton
against the sclera
This will make the
patient blink
11
12. CONT....
Normal response:-
Blink closure of the eye
Blinking also need 7 CN(Facial nerve) function as it
control eyelid closure
Absence response:-
Bells palsy
Trigeminal neuralgia
Brain injury 12
14. TECHNIQUE
Ask the patient open the
mouth
inspect the palatal arch on
each side for asymmetry.
Use a tongue blade to
depress the base of the
tongue gently if necessary
Ask the patient to say
"ahhh" as long as possible
14
15. CONT....
Normal response:-
Normal palatal arches will constrict and elevate,
and the uvula will remain in the midline as it is
elevated
The soft palate move up
Absence response:-
In paralysis there is no elevation or constriction of
the affected side.
15
20. TECHNIQUE:-
•The patient should be bed in the supine
position and relaxed.
•Uncover the abdomen
•See that his abdomen muscle are well relaxed
•Use a blunt (key,wooden end of a cotton-tip)
object gently stroke on the abdominal skin from
lateral to the medial aspect in four quadrant .
•
•Note the contraction of the abdominal muscles
and deviation of the umbilicus toward the area
stimulus.
20
21. Normal response:-
The normal responses is contraction of the
underlying muscle with the umbilicus moving
laterally and up or down depending upon the
quadrant tested.
Absense response:-
Abdominal reflexes may be absent in both central
and peripheral nervous system disorders
Lost in upper motor lesion.
Obesity
Eldery patient
21
23. TECHNIQUE:-
Ask the patient in a
supine position and tell
him or her that you are
going to scratch the foot
use the wooden end of
an “orange stick” (thin
stick with cotton wool on
one end) however any
instrument may equally
be used if it is not too
sharp
23
24. CONT.....
Fixate the foot by grasping the ankle or medial
surface with the examiner's hand that will be closest
to the midline of the patient: examiner's left hand
when the patient's left foot is being tested, and vice
versa with the right foot. Begin with light stroking,
using your finger; then use a blunt object such as
the point of a key.
The lateral side of the sole of the foot is rubbed
with a blunt instrument or device so as not to cause
pain, discomfort, or injury to the skin; the instrument
is run from the heel along a curve to
the toes (metatarsal pads) 24
25. Normal response:-
The normally big toe
will reflex at the
metatarsophalangeal
joint
Absence:-
Cold feet
Relevent muscle paralysis
Anesthesia of skin of foot
25
27. TECHNEQUE
The cremasteric reflex is a superficial (i.e., close
to the skin's surface) reflex observed in human
males.
This reflex is elicited by lightly stroking the superior
and medial (inner) part of the thigh regardless of
the direction of stroke. The normal response is an
immediate contraction of the cremaster muscle that
pulls up the ipsilateral testis .
27
28. CONT....
Normal response:-
The normal responses contraction of the
cremasteric muscle pulls up the scrotum and
testicle on the side examined
Absence response:-
The cremasteric reflex may not be eliciated in
elderly patient
upper and lower motor neuron disorders,
spine injury 28
30. DEEP TENDON REFLEX
Deep tendon reflex also usually refers to this
sense.
It is monosynaptic reflex
A deep tendon reflex is the involuntary contraction
of a muscle in response to stretch
Tendon reflex tests are used to determine the
integrity of the spinal cord and peripheral nervous
system, and they can be used to detect the
presence of a neuromuscular disease.
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32. TECHNIQUE:-
The forearm should be
supported, either resting
on the patient's thighs or
resting on the forearm of
the examiner.
The arm is midway
between flexion and
extension.
Place your thumb firmly
over the biceps tendon,
with your fingers curling
around the elbow,
and tap briskly. The
forearm will flex at the
elbow.
32
33. Normal response:-
flexion of the muscle
Visible contraction of the biceps muscle
33
35. TECHNIQUE:-
Support the patient's
forearm by cradling it with
yours or by placing it on
the thigh,
with the arm midway
between flexion and
extension. Identify the
triceps tendon at its
insertion on the
olecranon, and tap just
above the insertion.
There is extension of the
forearm.
35
36. Normal response:-
Extension of elbow
Contraction of the triceps
Absence response:-
spondylosis,
poliomyelitis.
36
38. The patient's arm should be
supported.
Identify the brachioradialis
tendon at the wrist. It inserts at
the base of the styloid process of
the radius,
usually about 1 cm lateral to the
radial artery
ask the patient to hold the arm
as if in a sling—flexed at the
elbow and halfway between
pronation and supination—
and then flex Place the thumb of
the hand supporting the patient's
elbow on the biceps tendon while
tapping the brachioradialis
tendon with the other hand.
Observe three potential reflexes
as you tap the forearm at the
elbow 38
39. Normal response
contraction of the brachioradialis
Flexion of the elbow and slight flexion of finger
Absence response
Trauma
polymeylitis
39
41. KNEE REFLEX (PATELLAR REFLEX)
41
Ask the patient in a
supine position
Pass your hand under
the knee to be tested
Support the relaxed les
with knee flexed at a
little less than 900
Strike the patellar
tendon midway b/w its
origin and its insertion
Look for a contraction
of the quadriceps.
42. Normal response
Muscles contract, and the contraction tends to
straighten the leg in a kicking motion
Absence response
Absence of the reaction suggests that there may be
damage to the central nervous system. The knee
jerk can also be helpful in recognizing thyroid
disease.
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44. TECHNIQUE:-
Ask the patient sit
position.
The patient leg is
externally rotated and
flexed at the knee.
The patient forefoot is
gently dorsiflexed and
the achilles tendon
Than struck with the
knee hammer
44
45. Normal response:-
brisk plantarflexion of the foot
Absence response:-
usually absent in disk herniations at the L5—
S1 level.
A reduction in the ankle jerk reflex may also be
indicative of peripheral neuropathy 45
47. TECHNIQUE:-
47
Ask the patient open
his mouth.
Partly open with his
mandible hanging
loosely.
A finger is placed over
the chin and a
downward stroke is
delivered with the knee
hammer
48. Normal response:-
Contraction of jaw-closer muscles; jaw closing
Absense response:-
Damage to the trigeminal nerve.
Facial paralysis
48