UCT: Medullary Lock/Review Questions
with complete solutions passed
Mechanism by which the medulla stays in the center of the foramen magnum and
spinal canal = Medullary lock or Myo dural bridge - correct answer ✔✔Medullary
Lock
4 External Mechanisms of Medullary Lock - correct answer ✔✔1. Dural
attachment to post. Arch of C1 and C2
2. Dural attachment to the foramen magnum
3. Connective bridge between RCPM and dura @C0/C1 junction
4. Ligamentum nuchae
Pulling on the dentate ligaments on 1 side will cause pressure onto the medulla or
occiput? - correct answer ✔✔Medulla
A tight right denticulate ligament will cause the ___ to place pressure on the left
side of the medulla, affecting spinocerebellar/spinothalamic tracts
A. Pia mater
B. Dura mater
C. Subarachnoid space - correct answer ✔✔A. Pia mater
, Relays information about limbs/joint position = Spinocerebellar or Spinothalamic
tract - correct answer ✔✔Spinocerebellar Tract
When the ___ tract has interference, there will be a corresponding leg length
disparity
A. Spinothalamic
B. Spinocerebellar - correct answer ✔✔B. Spinocerebellar
True or False: The doc should have a 30 degree angle during inferior knee-chest
atlas listing - correct answer ✔✔True
Inferior elbows should be at what level for a right listing?
A. 12-1
B. 1-2
C. 2-3 - correct answer ✔✔C. 2-3
True or False: Right inferior torque is clockwise - correct answer ✔✔False;
counterclockwise
Contact points for superior listing are ___ of the posterior arch
A. On the top
B. On the bottom - correct answer ✔✔B. On the bottom
with complete solutions passed
Mechanism by which the medulla stays in the center of the foramen magnum and
spinal canal = Medullary lock or Myo dural bridge - correct answer ✔✔Medullary
Lock
4 External Mechanisms of Medullary Lock - correct answer ✔✔1. Dural
attachment to post. Arch of C1 and C2
2. Dural attachment to the foramen magnum
3. Connective bridge between RCPM and dura @C0/C1 junction
4. Ligamentum nuchae
Pulling on the dentate ligaments on 1 side will cause pressure onto the medulla or
occiput? - correct answer ✔✔Medulla
A tight right denticulate ligament will cause the ___ to place pressure on the left
side of the medulla, affecting spinocerebellar/spinothalamic tracts
A. Pia mater
B. Dura mater
C. Subarachnoid space - correct answer ✔✔A. Pia mater
, Relays information about limbs/joint position = Spinocerebellar or Spinothalamic
tract - correct answer ✔✔Spinocerebellar Tract
When the ___ tract has interference, there will be a corresponding leg length
disparity
A. Spinothalamic
B. Spinocerebellar - correct answer ✔✔B. Spinocerebellar
True or False: The doc should have a 30 degree angle during inferior knee-chest
atlas listing - correct answer ✔✔True
Inferior elbows should be at what level for a right listing?
A. 12-1
B. 1-2
C. 2-3 - correct answer ✔✔C. 2-3
True or False: Right inferior torque is clockwise - correct answer ✔✔False;
counterclockwise
Contact points for superior listing are ___ of the posterior arch
A. On the top
B. On the bottom - correct answer ✔✔B. On the bottom
