Anatomy of the Spinal Cord Flashcards Preview

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Flashcards in Anatomy of the Spinal Cord Deck (47)
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1

Vertebral Canal

  • The spinal canal is the space in the vertebral column formed by the vertebrae through which the spinal cord passes 

2

Filum terminale

  • A fibrous extension of the pia mater, extends even farther into the coccygeal canal to attach to the posterior coccyx
  • Proceeds downward from the apex of the conus medullaris 

3

Spinal cord conus medullaris 

  • The cone shaped end of the spinal cord
  • Ends at the level of L1 or L2

4

Foramen Magnum

  • Level of the origin of the spinal cord

5

Denticulate ligaments

  • Saw-toothed shelves of the pia mater
  • Secures the spinal cord to the bony wall of the vertebral column all along its length 

6

Level of the termination of the spinal cord

  • The spinal cord ends at the level L1 or L2

7

Length of the spinal cord

  • Approximately a meter long
  • Ends at L1 or L2

8

Meninges

  • The three membranes (dura mater, arachoid layer, and pia mater) that lines the skull and the vertebral spinal cord
  • Encloses the bone and spinal cord 

9

Subarachnoid Space

  • Space between the arachnoid layer and the pia mater that has threadlike projections and contains the spinal fluid 

10

Subdural space

  • Space that is between the dura mater and the arachnoid layer 

11

Epidural space

  • Space between the dura mater and the bones of the vertebral canal

12

Cerebrospinal Fluid (CSF)

  • A liquid that fills the ventricles of the brain, the central canal of the spinal cord, and the space between the CNS (brain and spinal cord), and dura mater
  • "Cushions"/protects the brain and spinal cord 

13

Dura Mater

  • "Tough mother"
  • The outermost, leathery double membraine layer of the meninges 

14

Arachnoid Layer

  • Delicate, weblike middle layer of the meninges 

15

Pia Mater

  • Delicate inner layer of the meninges which is highly vascular 

16

Number of spinal nerves

31 pairs

17

Cervical Enlargment

  • A thickening in the spinal cord that supplies nerves to the upper limbs
  • Corresponds with the attachments of the large nerves which supply the the upper limbs
  • Extends from C3 to T2

18

Lumbar enlargment 

  • A widened area of the spinal cord that gives attachment to the nerves which supply the lower limbs
  • From L2 to S3

19

Cauda equina 

  • "Horse's tail"
  • Spinal nerves that extend down the vertebral canal past the level of the spinal cord (beyong L1 or L2) 

20

Location of where a lumbar (spinal) tap would be made 

L4/L5

21

Location of where a saddle block/epidural would be made

L3-L5

22

Gray Matter

  • The darker tissue of the spinal cord
  • A zone or layer of tissue in the central nervous system where the neuron cell bodies, dendrites, and synapses are found
  • The core "butterfly" of the spinal cord 

23

Characteristiscs of gray matter

  1. Butterfly shape
  2. Made up of neurons
  3. Not myelinated 

24

Generalization of the "butterfly" 

  • The central "butterfly" is gray matter
  • Gray matter contrains cell bodies, dendrites, and unmyelinated cells 

25

Posterior Dorsal Horns 

  • Recieves sensory fivers from the spinal nerves 
  • The two dorsal projections of the gray matter recieves sensory fivers from the spinal cord 

26

Anterior (ventral) horns 

  • Contains the cell bodies of lower motor neurons
  • The tips of the ventral horns are boarder and less tapered than those of the dorsal horns 

27

Gray Commissure

  • The central area of gray matter connecting the two vertical regions 

28

Central canal

  • The gray commissure surrounds the central canal of the spinal cord
  • The central canal is a cerebrospinal fluid filled spaced that runs longitudinally through the entire length of the spinal cord 

29

Arachnoid Layer

  • Delicate, weblike middle layer of the meninges 

30

Pia Mater

  • Delicate inner layer of the meninges which is highly vascular