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Flashcards in Back 2 Deck (27):
1

Internal "Epidural" Venous Plexus

  • Drains blood from surface of spinal cord and Basilateral vein (from vertebral body)
  • neither of these have valves
  • tributaries with veins in pelvis and thoracic wall
  • communicates with veins in cranial cavity

2

Membranes surrounding spinal cord

  • Dura Mater
  • Arachnoid Mater
  • Pia Mater

3

Subarachnoid Space

  • Space beneath arachnoid mater containing 1) spinal cord 2) spinal nerve roots 3) dorsal ganglia

4

Epidural Space

  • Contains adipose tissue and Internal venous plexus

5

Types of vessels needed for spinal cord perfusion

  • Longitudinal 
  • Feeder (enter IV foramen)

6

Longitudinal Vessels

  • 1 anterior spinal artery
  • 2 posterior spinal arteries 

7

Spinal arteries

  • arise from posterior intercostal arteries
  • enter IV foramen

8

Radicular arteries

  • Arise from spinal arteries
  • perfuse dorsal and ventral roots

9

Segmental medullary arteries 

  • Large spinal arteries 
  • merge with and reinforce longitudinal spinal arteries

10

Posterior intercostal arteries

  • from aorta
  • give rise to spinal arteries

11

Path to dorsal/ventral root perfusion 

Aorta -->Posterior intercostal artery-->spinal artery--> radicular artery

OR

Aorta-->Posterior intercostal artery-->segmental medullary artery-->longitudinal spinal arteries (anterior and posterior)

12

Great anterior segmental artery

  • "Artery of Adamiewicz"
  • largest segmental medullary artery 
  • rises from lower intercostals
  • reinforces 2/3 of cord circulation 

13

Things vertebral canal houses

  • Meninges 
  • spinal cord

14

Number of pairs of spinal nerves

31

15

spinal cord is continuation of...

medulla oblongata

16

length of spinal cord

base of skull to ~L2

17

proportion of vertebral canal occupied by spinal cord

2/3

18

longest nerve roots (and reason)

  • Lumar and sacral/coccygeal 
  • bony vertebrae grow faster than nerves

19

Conus medullaris 

Tapered end of spinal cord (~ L2)

20

internal filium terminale

extends from end of conus medullaris to interior end of dural sac

21

external filium medullaris 

extends from edge of dural sac to sacrum and provides stability to spinal cord

22

Two spinal cord enlargements

  1. Cervical enlargement - innervates upper limbs
  2. Lumbosacral enlargement - innervates lower limbs

23

Cauda Equina

  • nerve roots from sacral and lumbar roots extending to their appropriate vertebrae 

24

Dural Sleeve

  • lateral extension of dura mater/dural sac along ventral and dorsal roots 

25

Recurrent meningeal nerves 

convey sensory informaiton from dura mater to spinal cord 

26

Arachnoid mater

  • encloses spinal cord, spinal nerve roots, dorsal root ganglion
  • held against inner surface of dura mater via pressure from CSF

27