B6.032 Prework 2: Spinal Cord, meninges, nerve roots Flashcards Preview

MM Test 1 > B6.032 Prework 2: Spinal Cord, meninges, nerve roots > Flashcards

Flashcards in B6.032 Prework 2: Spinal Cord, meninges, nerve roots Deck (31):
1

where is the spinal cord

originates at foramen magnum
extends to L1-L2 region

2

what is the cauda aquina

nerve bundle extending downward from spinal cord

3

what are the 3 layers of meninges

from inside to outside
*pia
subarachnoid space
*arachnoid
*dura mater
epidural space
vertebral bone

4

function of pia

adheres to cord and nerve roots
contains blood vessels to supply the nerves

5

subarachnoid space

contains CSF
ends at S2
tap below L2 where the spinal cord ends

6

epidural space

contains lymphatics, fat, and venous plexus
important for spinal drainage
injections here treat nerve root pain

7

dorsal roots

sensory nerve roots

8

ventral roots

motor nerve roots

9

union of dorsal and ventral roots

spinal nerves

10

divisions of spinal nerves

dorsal ramus (smaller)
anterior ramus (larger)

11

function of dorsal ramus

innervates structures of the dorsal trunk
medial branch innervates facet joints

12

function of anterior ramus

lumbosacral plexus comes from here
innervates lower limbs and ventral trunk

13

pattern of spinal nerves in cervical region

ABOVE vertebral level
except at C7 vertebra
one above (C7)
one below (C8)

14

pattern of spinal nerves in rest of the spine

BELOW vertebral level
aka T1 nerve below T1 vertebra

15

what types of conditions can cause neural tissues problems

compression
traction
inflammation infection

16

neural tissues

spinal cord
cauda equina
nerve roots
spinal nerves
plexus and peripheral nerves

17

radicular symptoms

leg pain > back pain
sharp pain distal to tissue injury
paresthesia
weakness

18

clinical exams for suspected neural tissue damage

neuro exam
electrophysiology
imaging
helps tell which tissues are compromised

19

components of neurological exam

myotomes
dermatomes
reflexes

20

myotomes

motor roots: key muscle testing
look for weakness and atrophy

21

dermatomes

sensory roots: cutaneous light touch
look for decrease in sensation

22

reflexes

L3, L4, L5, S1, Babinski
look for hypo or hyper reflexes

23

nerve root injury result

sensory and motor changes IN SPECIFIC DERMATOME AND MYOTOME patter
hypo reflexes

24

spinal cord injury result

symptoms of NONSERMATOME AND NONMYOTOME pattern of multiple segments
hyper reflexes

25

L1 root

sensory- groin
no motor or reflex

26

L2 root

sensory- anterior proximal thigh
motor- hip flexion

27

L3 root

sensory- medial aspect of distal thigh and knee
motor- knee extension
reflex- patellar tendon

28

L4 root

sensory- lateral aspect of knee or medial distal legs
motor- DF/Inv
reflex- patellar tendon

29

L5 root

sensory- dorsum of foot
motor- toe extension
reflex- prox hamstring tendon

30

S1 root

sensory- lateral foot
motor- gastrocnemious/ soleus, eversion
reflex- achilles

31

S2 root

sensory- medial aspect of heel
motor-toe flexion