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Flashcards in Peripheral Nervous System Deck (44):
1

3 Components of PNS

- Cranial Nerves

- Spinal Nerves

- Ganglia

2

Where is gray matter in the PNS?

in the ganglia

(dorsal root and autonomic)

3

Where is white matter in the PNS?

in cranial and spinal nerves

4

What makes a nerve an organ?

it contains different types of tissue

nervous tissue wrapped in layers of of connective tissue and containing blood vessels lined with epithelial tissue

5

Schwann cells

- cells that surround PNS axons and myelinate them

6

mixed nerves

nerves containing both sensory and motor axons

7

nerve fiber

a long axon

8

nerve

a collection of nerve fibers (axons) bundled into fascicles, all surrounded by epineurium (tough fibrous CT sheath)

9

Cranial Nerves

- 12 nerves numbered I-XII (rostral to caudal)

- attach to brain, pass through foramina of skull and innervate head and neck structures (except vagus)

- contain both sensory and motor nerve fibers

10

Which cranial nerves attach to the forebrain?

I (Olfactory) and II (Optic)

11

Which cranial nerves attach to the brain stem?

III-XII (all but optic and olfactory)

12

Sensory Neurons of Cranial Nerves

- cell bodies within receptor organs (nose, eye, tongue)

- cranial sensory ganglia along some cranial nerves external to brain

13

Motor Neurons of Cranial Nerves

- cell bodies in nuclei of brain stem

14

cranial nerve classification

- Sensory

- Motor

- Mixed

15

Cranial Nerve I

Olfactory Nerve

- Sensory nerve of smell

16

Q image thumb

structures on inferior side of frontal lobes supported by cribriform plate of ethmoid bone which leads to nerve filaments that sense smell

17

bundles of axons connecting olfactory bulbs to brain

olfactory tracts

18

Cranial Nerve II

Optic Nerve

- sensory nerve of vision

19

crossing of highlighted structures

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optic chiasm

- crossing of optic nerves directly inferior to the hypothalamus

20

#2

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optic tract

- continuation of optic nerve from optic chiasm to the thalamus

21

Cranial Nerve III

Oculomotor Nerve

- motor neurons

- innervates 4 extrinsic eye muscles

22

Cranial Nerve IV

Trochlear Nerve

- motor nerve

- innervates one extrinsic eye muscle (superior oblique)

23

Cranial Nerve V

Trigeminal Nerve

- mixed nerve

- sensory innervation to face, chewing muscles

24

Cranial Nerve VI

Abducens Nerve

- motor nerve

- abducts the eyeball (via lateral rectus muscle)

25

Cranial Nerve VII

Facial Nerve

- mixed nerve

- innervates facial muscles for expression

- sensory innervation for taste

26

Cranial Nerve VIII

Vestibulocochlear Nerve

- sensory nerve for hearing and balance

27

Cranial Nerve IX

Glossopharyngeal Nerve

- mixed nerve

- sensory innervation to tongue

- motor innervation to pharynx

 

 

28

Cranial Nerve X

Vagus Nerve

- mixed nerve

- sensory and motor innervation for pharynx, larynx and viscera

29

Cranial Nerve XI

Accessory Nerve

- motor nerve

- accessory part of Vagus nerve

- motor innervation to neck and upper back

30

Cranial Nerve XII

Hypoglossal Nerve

- motor nerve

- runs inferior to tongue, innervating its muscles

31

Cranial Nerve Names and #s Mnemonic

Oh, Oh, Oh, To Touch And Feel Very Good Velvet, HA!

  1. Olfactory
  2. Optic
  3. Oculomotor
  4. Trochlear
  5. Trigeminal
  6. Abducens
  7. Facial
  8. Vestibulocochlear
  9. Glossopharyngeal
  10. Vagus
  11. Accessory
  12. Hypoglossal

32

Mnemonic for Nerve Types of Cranial Nerves I-XII

(Sensory, Motor or Both)

Some Say Marry Money But My Brother Says Big Brains Matter More

33

Spinal Nerves

31 pairs attaching to SC through dorsal and ventral roots:

8 Cervical (one from above atlas vertebrae)

12 Thoracic

5 Lumbar

5 Sacral

1 Coccygeal

34

which set of spinal nerves?

Q image thumb

Cervical Nerves

- 1st pair superior to atlas

- last pair inferior to C7

35

which set of spinal nerves?

Q image thumb

thoracic nerves

- 12 pairs T1-12

- exit below vertebra of same number

36

which set spinal nerves?

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lumbar nerves

- L1-5

- exit below vertebra of same number

37

which set of spinal nerves?

Q image thumb

sacral nerves

- S1-5

- exit below vertebra of same number

38

name of most inferior set of nerves pictured

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coccygeal nerves

- 1 pair named Co1

39

Nerve Plexus

- networks of intersecting nerves

- originate from anterior rami of all spinal nerves but T2-T12

40

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cervical plexus

- anterior rami of C1-4

- innervate skin/muscles of neck and diaphragm

- Phrenic Nerve

41

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brachial plexus

- C5 through T1

- innervates skin and muscles of arms

- Axillary, Radial, Median and Ulnar Nerves

42

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lumbar plexus

- L1 - L4

- innervates anterior/medial thigh and skin of medial leg

Femoral and Obturator Nerves

 

43

the grouping of nerves shown here

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sacral plexus

- L4, L5 and S1-S4

- innervates most of lower limbs

- Sciatic Nerve

44

the small yellow nodules lined up parallel to the spine here

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paravertebral ganglia

- AKA sympathetic trunk/chain

- on both sides of vertebral column from neck to pelvis

- joined to ventral rami of spinal nerves by rami communicantes

- bundles of neuron bodies of the sympathetic nervous system