Spinal Cord and Meninges Flashcards Preview

Spot Test 2- Lower Limb > Spinal Cord and Meninges > Flashcards

Flashcards in Spinal Cord and Meninges Deck (30):
1

Where do spinal nerves pass out of the Vertebral Canal?

Intervertebral Foramina (formed by Superior and Inferior Vertebral Notches on Adjacent Vertebrae)

2

How many cervical vertebrae/spinal nerves

7 Cervical Vertebrae
8 Pairs Spinal Nerves

3

How many thoracic vertebrae/spinal nerves

12 Thoracic Vertebrae
12 Pairs Thoracic Spinal Nerves

4

How many Lumbar vertebrae/spinal nerves

5 Lumbar Vertebrae
5 Pairs Lumbar Spinal Nerves

5

How many Sacral vertebrae/spinal nerves

5 Sacral Vertebrae
5 Pairs Sacral Spinal Nerves

6

How many Coccygeal vertebrae/spinal nerves

1 Coccygeal bone (multiple fused)
1 Nerve

7

Where do C1-C7 spinal nerves pass out?

Above their corresponding vertebrae

8

Where does C8 spinal nerve pass out?

Below C7 Vertebrae

9

Where do T1 and below Spinal nerves pass out?

Below their corresponding vertebrae

10

What is the Cervical Enlargement

Enlargement of the VGH as motor fibres to Brachial Plexus arise

11

What is the Lumbar/Sacral Enlargement

Enlarged VGH as motor fibres to the Lumbosacral plexus arise

12

Conus Medullaris

Tapered end of the SC within the SC

13

Level of Conus Medullaris in adults

L1-L2

Due to SC regression during growth

14

Level of Conus Medullaris in neonates

L3-L4

15

Filum Terminale

Modification of Pia Mater from Conus Medullaris to Co1

Gives Longitudinal support to SC

16

Approximate length of Filum Terminale

20cm

17

Lumbar Cistern

Enlargement of Subarachnoid Space beneath level of the CM

18

Contents of the Lumbar Cistern

CSF
Filum Terminale
Cauda Equina

19

Clinical significance of Lumbar Cistern

Site of Lumbar Puncture (L4-L5) as less chance of damaging nerves

Surface landmark: Posterior Iliac Crest

20

Cauda Equina

Bundle of nerves associated with vertebrae below level of CM. Nerves descend in bundle to appropriate IVF

21

Sx of Cauda Equina Syndrome

Micturition Difficulties
Loss of Anal Sphincter Tone (Incontinence)
Saddle Anaesthesia
Lower Back/Leg Pain

22

Blood Supply to the Spinal Cord

2 Posterior Spinal As
1 Anterior Spinal As
8-10 Segmental Medullary As/Radicular As (arising from Posterior Intercostal As)

23

Venous Drainage of SC

Anterior/Posterior Spinal Veins

Drain into Internal Vertebral Plexus in Epidural Fat

Drains into large systemic veins and Azygous system

24

At which levels is the Lateral Grey Horn present, and why?

T1-L2
S2-S4

Sympathetic chain/splanchnic nerves arise at these levels

25

Dura mater in the SC?

Only one layer (meningeal)

Periosteal layer reflects and adheres to external bone of skull

26

Denticulate Ligaments

Modifications of Pia mater that project to lateral walls of Vertebral Canal

Stabilise the SC

27

Types of fibres in Dorsal Root

Sensory (somatic and visceral)

Cell bodies in DRG

28

Types of fibres in Ventral Root

Somatic Motor
Visceral Motor

(separate to one another. Cell body in VGH)

29

Superior and Inferior limits of Epidural/Extradural Space?

Foramen Magnum

Sacrococcygeal Membrane @ tip of sacrum

30

Superior and Inferior limits of Subarachnoid Space?

Cerebral Cortex

S2