2. 2
Where does the spinal cord
end?
๏จ
๏จ
๏จ
Adult spinal cord - 45 cm long
Originates at the medulla
Ends at the conus medullaris
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3. Fetal life
3
๏จ
Until the third month of fetal life
๏ค Spinal
๏จ
cord is as long as the vertebral canal
After the third month of fetal life
๏ค Vertebral
column elongates faster than the
spinal cord
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4. Adults
4
๏จ
๏จ
Vertebral column is longer than the spinal cord
Common cause of spinal cord disease
๏ค Diseases
of the vertebrae
๏ฎ Fracture
๏ฎ Infection
๏ฎ Secondary
deposits
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11. Adults โ L 1
11
๏จ
๏จ
Spinal cord ends at the lower level of first
lumbar vertebral body
Cervical enlargement
๏ค Innervate
๏จ
the upper extremities
Lumbar enlargement
๏ค Innervate
the lower limbs
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12. Cauda equina (horse's tail)
12
๏จ
Different growth rates of the cord and spine
๏ค Vertebral
๏จ
๏จ
column is longer than the cord
Cord segments are above their
corresponding vertebrae
Lumbosacral region
๏ค Nerve
roots descend almost vertically below
the cord to form the cauda equina
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19. Ventral (anterior) roots
19
๏จ
Alpha motor neuron axons
๏ค To
๏จ
the extrafusal striated muscle fibers
Gamma motor neuron axons
๏ค To
the intrafusal muscle fibers
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25. 25
Hallmark of spinal cord
disease
๏จ
๏จ
Loss of motor and sensory functions below
the level of the lesion
Loss of autonomic functions occurs below
the level of the lesion
๏ค Loss
of urinary bladder tone
๏ค Paralytic ileus
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26. Horizontal level in the body
26
๏จ
Sensory level
๏ค Damage
๏จ
to the ascending spinothalamic tract
Motor level (i.e., paraplegia or quadriplegia)
๏ค Damage
to the descending corticospinal and
other motor tractsโฆโฆโฆ..
For rest of the slides visit www.medicinemcq.com > Neurology
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