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Title:

SPINAL CORD AND NERVES

Description:

IV - Trochlear. V - Trigeminal. VI - Abducens. VII - Facial. VIII - Auditory. IX - Glossopharyngeal ... trochlear. Trigeminal nerve. Motor and sensory. shingles ... – PowerPoint PPT presentation

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Title: SPINAL CORD AND NERVES


1
SPINAL CORD AND NERVES
2
Outline
  • Spinal cord
  • - General considerations
  • - Gray matter arc reflex
  • - White matter Sensory and motor tracts
  • Nerves
  • - Cranial nerves
  • - Spinal nerves

3
Outline
  • Spinal cord
  • - General considerations
  • - Gray matter arc reflex
  • - White matter Sensory and motor tracts
  • Nerves
  • - Cranial nerves
  • - Spinal nerves

4
Spinal cord
  • Continuation of medulla oblongata
  • From C1 to L1-l2
  • Surrounded by meninges dura mater, arachnoid and
    pia mater)
  • Cerebrospinal fluid surrounding it
  • Epidural space between vertebra and dura mater
    (fatty tissue blood vessels)
  • Lumbar puncture between L2-L3 or L3-L4

5
Spinal cord
6
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7
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8
Spinal cord
  • Internal gray matter presence of neurons
    relaying and integrating motor/sensory impulses
  • Fiber tracts sensory and motor

9
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10
Outline
  • Spinal cord
  • - General considerations
  • - Gray matter arc reflex
  • - White matter Sensory and motor tracts
  • Nerves
  • - Cranial nerves
  • - Spinal nerves

11
Arc reflex
  • Arc reflex (fast and involuntary)

12
Outline
  • Spinal cord
  • - General considerations
  • - Gray matter arc reflex
  • - White matter Sensory and motor tracts
  • Nerves
  • - Cranial nerves
  • - Spinal nerves

13
Sensory tracts
14
Motor tracts
15
Outline
  • Spinal cord
  • - General considerations
  • - Gray matter arc reflex
  • - White matter Sensory and motor tracts
  • Nerves
  • - Cranial nerves
  • - Spinal nerves

16
  • Cranial nerves

17
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18
Cranial nerves
  • I - Olfactory
  • II - Optic
  • III - Oculomotor
  • IV - Trochlear
  • V - Trigeminal
  • VI - Abducens
  • VII - Facial
  • VIII - Auditory
  • IX - Glossopharyngeal
  • X - Vagus
  • XI - Accessory
  • XII - Hypoglassal

19
Olfactory nerve
20
Optic nerve
21
Oculomotor nerve
22
trochlear
23
Trigeminal nerve
  • Motor and sensory

24
shingles
25
Abducens nerve
26
Facial nerve
  • Motor and sensory

27
Bells palsy
28
Vestibulocochlear nerve
29
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30
Vagus nerve
  • Sensory
  • Motor
  • 75 autonomic

31
Accessory nerve
32
Accessory nerve
33
Hypoglossal nerve
34
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35
Outline
  • Spinal cord
  • - General considerations
  • - Gray natter arc reflex
  • - White matter Sensory and motor tracts
  • Nerves
  • - Cranial nerves
  • - Spinal nerves

36
Spinal nerves
  • Originate at the root between each vertebra? 31
    pairs
  • Formed by the fusion of the sensory and motor
    roots
  • Organized into cervical, thoracic, lumbar, sacral
    and coccygeal nerves

37
Spinalnerves
38
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39
Spinal nerve structure
40
Dermatomes
41
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42
Spastic paralysis
  • The upper motor neuron, located in the motor
    cortex has been destroyed (by a stroke, for
    example)? the lower motor neuron can still be
    stimulated by reflex arc and trigger movements
    (which are involuntary and spastic)

43
Flaccid paralysis
  • The lower motor neuron located in the anterior
    horn of the spinal cord is damaged ? no impulse
    can reach the muscle fibers ? no contraction
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