Spinal cord anatomy Flashcards Preview

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Flashcards in Spinal cord anatomy Deck (35):
0

Protective structures of spinal cord

meninges - membranes
Vertebrae - bone
Fluid - CSF (cerebrospinal fluid)

1

Meninges and spaces

Epidural space - Dura mater-subdural space - arachonoid mater -subarachoid space - pia mater - dentriculate ligaments

2

Superficial layer of meninges

Dura mater: dense irregular connective tissue, thick and strong

3

Middle layer meninges

arachoid mater: avascular, delicate collagen fibers and some elastic fibers. Spider web

4

Innermost layer of meninges

Pia mater, thin and transparent, adheres to surface of spinal cord and brain (saran wraps)

5

Space between vertebral canal and dura mater

Epidural space (filled with extracellular fluid)

6

Space between dura mater and arachnoid mater

Subdural space (Extracellular space)

7

space between arachnoid mater and pia mater

subarachnoid space

8

extensions of pia mater that suspend the spinal cord in the middle

Denticulate ligaments: protect against sudden displacement

9

Spinal cord external anatomy shape, length

Oval (flattened anteriorly and posteriorly) from medulla oblongata to L2 (in new borns it goes to L3-L4)

10

Cervical enlargement

From C4 to T1
Nerves to end and from the arms

11

Lumber enlargement

from T9 to T12
nerves to and from legs

12

Tapering end of spinal cord

conus medullaris, ends between L1 and L2

13

Extension of pia mater

filum terminale, runs from conus medullaris to coccyx, anchors spinal cord to coccyx

14

Spinal nerves at the end of spinal cord

cauda equina

15

Paths of communication between spinal cord and specific areas of the body

Spinal nerves. Peripheral nerves system

16

smaller bundles of axon

rootlet

17

two bundle of axons called

root

18

Posterior (dorsal) root and rootlets

contain only SENSORY axons, which conduct nerve impulses from sensory receptors in the skin, muscles and internal organs into the central nervous system. Afferent

19

Anterior (ventral) root and rootlet

contain axons of MOTOR neurons, which conduct nerve impulses from the CNS to effectors (muscles and glands)

20

White matter of spinal cord consists

bundles of myelinated axons of neurons

21

Grey matter

Unmyelinated axons
Dendrites and cell bodies
Neuroglia

22

Central Canal

entire length of the spinal cord and is filled with cerebrospinal fluid

23

Gray commisure

forms the crossbar of H

24

A narrow furrow on the posterior side

Post median sulcus

25

wide groove on the anterior side

Anterior median fissure/sulcus

26

Posterior Grey Horns

incoming sensory axons and all bodies and axons of interneurons

27

Anterior Grey Horns

Outgoing motor axons and all bodies of interneurons

28

Lateral Grey Horns

Only found in T-spine and upper lumber
Autonomic motor cell bodies

29

Bundles of Axons in the CNS

Tracts

30

Bundles of axons in the PNS

Nerves

31

Clusters of cell bodies in the CNS

Nuclei

32

Clusters of cell bodies in the PNS

Ganglion

33

Spinal nerves covering

Endoneurium, Perineurium, Epineurium

34

Rami

1. Posterior Ramus (mm+skin of posterior trunk)
2. Anterior Ramus (mm+skin of limbs, skin of lat and ant trunk)
3. Meningeal branch ( re-enter vertebral canal to supply vertebra, vertebral ligament, Blood vessels of spinal cords, meninges)
4. Rami communicantes (rami communications, ANS)