Anatomy Flashcards
1
Q
C1-2 motion
A
50% of ROTATION
2
Q
Normal ADI
A
Adult = <3 mm Kid = <5 mm
3
Q
Orientation of cervical facets on axial CT
A
Superior facet is ANTERIOR (lower level)
4
Q
Odontoid ossification centers
A
Primary fuses at age 6
Secondary (tip) appears at age 3, fuses at age 12
5
Q
Odontoid vascular supply
A
Base = Vertebral artery Tip = internal carotid
6
Q
Os odontoideum and contact sports
A
Contraindicated
7
Q
Occiput-C1 motion
A
50% of flexion-extension
8
Q
Changes in IV disc with aging
A
Loss of water Decrease in proteoglycans More fibrocartilage Increase in Keratin to Chondroitin sulfate ratio No change in collagen amount
9
Q
Position with highest intra-discal pressures
A
Sitting leaning forward
10
Q
Facet joint innervation
A
Medial branch of dorsal primary rami and sinuvertebral nerve
11
Q
Degen spondy most common level
A
L4-5
12
Q
Isthmic spondy most common level
A
L5-S1
13
Q
Trajectory for C1 lateral mass screws
A
10 degrees medial
22 degrees cephalad
