Spinal Cord Flashcards
1
Q
Dermatomes
A
- area of skin innervated by particular spinal nerve
- describe dermatome of limbs
2
Q
Meninges
A
pia matter on cord subarachnoid space arachnoid matter epidural space dura matter subdural space bone
3
Q
Grey vs White matter
A
grey = cell bodies (butterfly) white = axons (myelinated)
4
Q
Peripheral vs spinal vs segments
A
- Spinal cord > 2 rami (sensory and motor separate) > SPINAL NERVE (mixed)> goes through intervertebral foramen > PERIPHERAL NERVE
- segments of spinal nerve
5
Q
naming of spinal nerves
A
- according to vertebrae where segment exists
- C: nerve exits ABOVE corresponding vert (8 nerves, 7 verts)
- everywhere else: nerve exits below
6
Q
Phrenic Nerve - which roots?
A
C3,4,5
7
Q
Sympathetic chain
A
T1-L2
8
Q
S2-S4
A
pudendal, roots of splanchnic
9
Q
name dermatome for: back of head shoulder thumb middle finger pinky nipples umbilicus
A
head C2 C5 thumb: C6 middle finger: C7 pinky: C8 nipples: T4 umbilicus: T10
10
Q
name dermatome for: groin knee big toe pinky toe sole of foot perianal
A
groin: L1
knee: L4
big toe: L5
pinky toe: S1
sole of foot S1
perianal: S5
11
Q
where does spinal cord end, what is called?
A
L2 @ conus medullaris
12
Q
What forms dura sac. where does it end?
A
dura and arachnoid matter
ends at S2
13
Q
What is the lumbar cistern? describe and where?
A
- subarachnoid space bt arachnoid and pia matter after cord ended at L2
- contain CSF, cauda equina, filum terminale interna
- L2-S2
14
Q
Filum interna
Filum externa
A
interna: in the lumbar cistern
externa: outside dura sac > coccyx
- anchoring
15
Q
Denticulate ligaments
A
pia matter!
-anchor spinal cord to dura sac
16
Q
what is in the epidural spce
A
fat, blood vessels
17
Q
Distinguish bt levels of cross sections of spinal cord
A
- Cervical: large ventral horns (C5-T1 ad L2-S3 enlargements for limbs)
- Thorcaci: Intermediolateral cell column (T1-L2 for sympathetic pregang neurons)
- Lumbar: S2-S4 has IML for parasymp pregang N
- less white matter (bigger butterfly)
