Spinal Cord Flashcards
Enlargements in the spinal cord
Cervical enlargement Lumbosacral enlargement Conus medullaris: like a cone Cauda equina Filum terminale
45 cm in length
Extemds from the brain to L1
Runs through the vertebral canal
Passes through foramen magnum
Spinal cord
What comes after L1?
If not: Tethering, defect, problem in the development of the muscles
Cauda equina
Nerve roots come out in…?
Exception: C8 nerve exits under C7
Below its corresponding vertebra
Conus medullaris syndrome
What is affected?
Functions of the sacral vertebra
-responsible for defecation
-sensations of the genitalia
Connected to the conus medullaris
Not a nerve
Filum terminale
Dura ends at? Where thecal sac ends..
S2
Where to do the lumbar puncture?
L4-L5
Enter the dura, to the thecal sac, to get to the CSF, without puncturing the conus medullaris
3 layers of the spinal meninges
Dura mater : white, very easy to separate
Arachnoid mater : beneath is the arachnoid space, where the CSF is
Pia mater
Sensation
Motor function
Dorsal root
Ventral root
Merge to form a spinal root
Space occupied by fat
Not actually a space but a space - Seng, 2014
Epidural fat
CSF in central canal
CSF can accumulate and compress everything
Leads to a defect
Cross-section of the spinal cord
Posterior gray horn - sensory
Anterior - motor
Lateral - automomics
Somatic sensory/substantia gelatinosa
Somatic motor
Visceral sensory : when someone breaks your heart
Visceral motor
Everything that is visceral is related to lateral gray horn: autonomics (visceral)
There is no ventral root ganglion
Why?
Rexed laminae (Bror Rexed)
reXed (10 lamina) NEED TO KNOW: Lamina 1 and 6: Sensory Lamina 2 and 3: contains substantia gelatinosa, functions in regulating afferent input to the spinal cord Lamina 7: Lateral Lamina 8 and 9: Anterior
