Anatomy of the Spinal Cord Flashcards Preview

Anatomy & Physiology Series > Anatomy of the Spinal Cord > Flashcards

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

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Vertebral Canal

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

2

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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

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Spinal cord conus medullaris 

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

4

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Foramen Magnum

  • Level of the origin of the spinal cord

5

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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

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  • The spinal cord ends at the level L1 or L2

7

Length of the spinal cord

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  • Approximately a meter long
  • Ends at L1 or L2

8

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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

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Subarachnoid Space

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

10

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Subdural space

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

11

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Epidural space

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

12

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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

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Dura Mater

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

14

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Arachnoid Layer

  • Delicate, weblike middle layer of the meninges 

15

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Pia Mater

  • Delicate inner layer of the meninges which is highly vascular 

16

Number of spinal nerves

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31 pairs

17

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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

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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

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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 

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L4/L5

21

Location of where a saddle block/epidural would be made

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L3-L5

22

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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

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

24

Generalization of the "butterfly" 

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

25

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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

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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

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Gray Commissure

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

28

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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

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Arachnoid Layer

  • Delicate, weblike middle layer of the meninges 

30

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Pia Mater

  • Delicate inner layer of the meninges which is highly vascular 

31

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Dura Mater

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

32

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Epidural space

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

33

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Subarachnoid Space

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

34

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Subdural space

Space that is between the dura mater and the arachnoid layer 

35

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Dorsal (Posterior) Root

  • The dorsal horns contain interneurons and sensory fibers that enter the cord from the body periphery via the dorsal root 

36

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Dorsal (posterior) root ganglion

  • Sensory fibers
  • Lacks motor neurons
  • The cell bodies of these neurons are found in the enlarged are of the dorsal root (called the dorsal root ganglion) 

37

Tracts

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Tracts

  • Collections of axons in CNS

38

Nerves

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Nerves

  • Collections of axons in PNS

39

Ganglia

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Ganglia

  • Collections of neuron cell bodies in PNS

40

Nucleus (nuclei) 

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Nucleus (nuclei) 

  • Collections of neuron cell bodies in CNS

41

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Dorsal Root

  • The dorsal root is an afferent root, meaning it carries neural signals from the limbs and organs back to the spinal cord and brain 
  • Afferent = sensory 

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Dorsal Root Ganglion

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Spinal Cord

 

44

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Ventral Root

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White Matter

46

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Gray Matter

47

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Spinal Ganglion