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Flashcards in Spinal Cord Deck (45):
1

ganglion

collection of nerve cell bodies in the PNS

2

dorsal root ganglion contains which kind of nerves?

sensory

3

ventral root ganglia contain which kind of nerve?

motor

4

spinal nerve

when dorsal and ventral root ganglia fuse

5

what is contained in the subarachnoid space?

CSF and fat and blood vessels

6

denticulate ligament

extension of the pia mater,
part of the anchoring mechanism to keep the spinal cord in place

7

supracristal line

highest point of the iliac crest

8

conus medullaris

terminal end of spinal cord (At L1-L2)
part of CNS

9

filum terminale

extension of pia mater from conus medullaris to cocccyx
fuses with arachnoid mater at coccyx
(not nervous tissue-only CT)

10

cauda equina

horse tail-like nervous tissue below L1
Part of PNS

11

why is the spinal cord thicker at the cervical and lumbar areas?

they have nerve endings for upper and lower extremities

12

gracile fasciculus

named part of dorsal columns

13

cuneate fasciculus

named part of dorsal columns

14

what kind of sensation travels in the dorsal columns?

finer vibration, procreation, discriminative touch

15

somatic motor neuron cell bodies make up what?

grey matter

16

what is inside the central canal?

CSF

17

alpha motor neuron

somatic motor neuron
-big fat and highly myelinated

18

thalamus

major sensory center for the brain

19

what is the hallmark of spinothalamic tract?

crosses as soon as it enters the spinal cord

20

what are the target organs for the autonomic nervous system?

smooth muscle
cardiac muscle
glands

21

proprioception

knowing where you are in space

22

what will sensory neurons do when they enter spinal cord?

1. synapse on interneurons
2. go directly into white matter and travel up or down several segments
3.cross over spinal cord

23

describe the cervical spinal cord

has tons of white matter and a large diameter

24

describe the thoracic spinal cord

small diameter
small anterior and posterior horns
sympathetic cell bodies are present

25

describe the lumbar spinal cord

nearly circular
large anterior and posterior horns
less white matter compared to cervical

26

describe the sacral spinal cord

small diameter, but large amt of gray matter
small amt of white matter

27

what cranial nerves are the nuclei for parasympathetic

vagus X
glossopharygeal IX
facial VII
oculomotor III

28

what is an inborn reflex?

have since birth

29

what is an acquired reflex?

learned reflex (motor learning)

30

what are the free nerve pain receptors?

nociceptors

31

how many nerves are involved in the withdrawal reflex?

3

32

what is the crossed extensor reflex?

when nociceptor senses pain on one side that causes withdrawal, motor neurons tell the other side to compensate

33

stretch reflex

mono synaptic
proprioreceptors in skeletal muscle that monitors change in length of muscle
prevent overstretching and damage of the muscles

34

what is the muscle fiber Ia?

muscle spindles

35

what is the muscle fiber Ib?

tendon organs

36

what is the muscle fiber II, Ab?

muscle spindles, mechanoreceptors

37

what is the muscle fiber Ag?

thermoreceptors, mechanoreceptors and nociceptors

38

what is the muscle fiber C?

thermoreceptors, mechanoreceptors, nociceptors

39

gamma motor neurons do what?

maintain the tension and contractile state of the muscle
-cell bodies in ventral gray matter

40

clonus

isolated movement of the reflexed area

41

reciprocal inhibition

when reflex is activated, an inhibitory response goes to the antagonistic muscle group to prevent contraction

42

hypotonic

floppy, low tone

43

hypertonic

parkinsons (rigidity)
spasticity

44

what are dermatomes?

provides sensory input to CNS

45

what are myotomes?

levels of spinal cord that contribute to innervation of skeletal muscle

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