Anatomy of the Spinal Cord Flashcards Preview

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

31

Dura Mater

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

32

Epidural space

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

33

Subarachnoid Space

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

34

Subdural space

Space that is between the dura mater and the arachnoid layer 

35

Dorsal (Posterior) Root

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

36

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

Tracts

  • Collections of axons in CNS

38

Nerves

Nerves

  • Collections of axons in PNS

39

Ganglia

Ganglia

  • Collections of neuron cell bodies in PNS

40

Nucleus (nuclei) 

Nucleus (nuclei) 

  • Collections of neuron cell bodies in CNS

41

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 

42

Dorsal Root Ganglion

43

Spinal Cord

 

44

Ventral Root

45

White Matter

46

Gray Matter

47

Spinal Ganglion