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