Lumbar & Innominates

Question 1

Where does the spinal cord end?

Answer 1

Between L1/L2

Question 2

How are lumbar nerves and vertebrae oriented?

Answer 2

There are 5 lumbar nerves and they are under their respective vertebrae.

Question 3

What spinal nerve levels become the sciatic nerve?

Answer 3

L4-S3

Question 4

What can irritate the sciatic nerve and what are the symptoms?

Answer 4

Tight piriformis muscle can cause pain and numbness down the posterior lateral leg to the back of the knee.

Question 5

What is Meralgia Paresthetica?

Answer 5

Impingement of the lateral femoral cutaneous nerve

Produces sensory loss or parasthesia of the upper and lateral thigh dermatome without motor/strength loss.

Question 6

Vertebral discs account for how much of the vertebral height?

Answer 6

1/4-1/3 of the total height

Question 7

By what age does the innominate fuse?

Answer 7

20-23 years

Question 8

What is the name of the socket where the head of the femur fits into?

Answer 8

Acetabulum

Question 9

The ischium fuses with the pubic bone to form what foramen?

Answer 9

Obturator foramen

Question 10

What kind of joint if the pubic symphysis?

Answer 10

fibrocartilaginous

Question 11

What is the iliolumbar ligament?

Answer 11

From iliac crest to L4/L5 and sacrum

Limits rotation of L5 and prevents anterior slippage of L5 on the sacrum

Question 12

What are the ant/pos sacral ligaments?

Answer 12

Run between the ilium and the sacrum and they stabilize the iliosacral joint.

Question 13

Describe sacroiliac joint

Answer 13

synovial/planar
L-shapes
At L2
No muscles specific for motion
Three axes of motion

Question 14

What is facet tropism?

Answer 14

Unequal size or facing of the facet joints in the spine

Question 15

What are sacralization of L5 and Lumbarization of S1?

Answer 15

L5 fuzes with sacrum, or S1 is free like the lumbar

Question 16

What is batwing deformity?

Answer 16

Large L5 transverse processes fuse with the sacrum or the ilium

Question 17

Spina bifida Occulta vs Cystica vs Meningocele vs Myelomeningocele

Answer 17

Occulta has no herniation
Cystica has herniation and has two types:
Meningocele has dura or meninges
Myelomeningocele has meninges and nerves

Question 18

What nerve is compressed if someone has numbness of the anterior upper thigh but no muscle weakness?

Answer 18

Lateral femoral cutaneous nerve

Question 19

What is the primary motion of the lumbar spine?

Answer 19

Flexion and Extension

Question 20

What is spondylosis?

Answer 20

Narrowing of the gap between vertebrae that can compress the spinal nerves and cause problems.

Question 21

What is spondylolysis?

Answer 21

Problems with the pars interarticularis, including a fracture at that point.

Question 22

What is spondylolisthesis?

Answer 22

Forward dislocation of a vertebra, usually L5