1.2 Spinal Cord and Autonomic Nervous System Flashcards Preview

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Flashcards in 1.2 Spinal Cord and Autonomic Nervous System Deck (59)
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1

In the adult the spinal cord ends as a tapered portion termed the ... at the L1 vertebral level.

  • In newborns it ends at L3 vertebral level)

conus medullaris

2

Due to the discrepancy between the spinal cord and the vertebral column, the more caudal spinal nerves are longer and more vertical forming the...

cauda equina

"horse tail"

3

What are the 3 layers, meninges, surrounding the spinal cord?

  1. Dura mater
  2. Arachnoid mater
  3. Pia mater

4

What connection of pia mater, connects the conus medullaris to the coccyx?

filum terminale

tethering to keep the coccyx in place

5

In the CNS, what forms the gray matter?

neuronal cell bodies

6

In the CNS, what forms the white matter?

interconnecting nerve fiber tracts 

7

In the CNS, what is a discrete group of neuronal cell bodies called?

Nucleus

8

In the PNS, what is a discrete group of neuronal cell bodies called?

Ganglion

9

What are spinal nerves responsible for?

Conveying information to/from the gray mater horns of the spinal cord

  • DO NOT supply internal structures (viscera within thoracic or abdominopelvic cavities)
  • DO NOT supply structers of the head

10

What is the Dorsal (posterior) horn of the CNS gray matter responsible for?

Receives Sensory Information

11

What is the Ventral (anterior) horn of the CNS gray matter responsible for?

Transmits Motor Information

12

What is the Lateral horn of the CNS gray matter responsible for?

Transmits Motor Information

13

Where do the 8 cervical paired spinal nerves recieve their name from?

 

  • C1 - C7 named for vertebra inferior to their exit
  • C8 exits between C7 and T1 vertebrae

 

14

Where do the 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal paired spinal nerves recieve their names from?

Named by vertebra superior to their point of exit 

i.e. T2 exits between vertebrae T2 and T3

15

Fibers emerge from the spinal cord as what?

rootlets

16

What do rootlets converge to form?

2 Nerve Roots

  • Anterior (ventral) - motor fibers from the ventral horn of the spinal cord
  • Posterior (dorsal) - sensory fibers from the dorsal horn of the spinal cord

17

What do the anterior and posterior roots converge to form?

Mixed Spinal Nerve

  • Contains both motor and sensory fibers (mixed fibers)

18

Where does the formation of the mixed spinal nerve occur?

At or near the intervertebral foramen

19

What does the mixed spinal nerve immediately divide into?

Anterior and Posterior Rami

Each ramus carries both sensory and motor fibers

*rami = branch

20

What does the posterior (dorsal) rami supply and what fibers does it carry?

  • Deep (true) muscles of the back
    • Somatic Motor
  • Overlying skin
    • Somatic sensory
  • Vasculature (arteries) structures supplying these structures
    • Postganglionic Sympathetic Fibers

21

What does the anterior (ventral) rami supply? 

  • Anterior and lateral trunk
  • Upper and lower limbs
    • Generally partcipating in plexus formation

22

What fibers does the anterior (ventral) rami carry?

  • Somatic motor
  • Somatic sensory
  • Postganglionic sympathetic fibers

23

Where are the cell bodies located in the sensory (afferent) subdivision of the PNS?

Outside, but close to the CNS

24

Where are the cell bodies located in the motor (efferent) subdivision of the PNS?

Gray matter of CNS

25

How do the sensory (afferent) fibers enter the CNS?

Via the posterior (dorsal) root) of spinal or cranial nerves

26

Where do the motor (efferent) fibers exit the CNS?

Anterior (ventral) roots of spinal or cranial nerves

27

What does the somatic subdivision of the PNS do? 

Conveys info to/from CNS, and body wall and extremities (skeletal muscle)

28

What does the visceral subdivision of the PNS do? 

Conveys info to/from CNS and, internal organs and blood vessels

29

How many neurons are between the CNS and the end organ (target) in the Somatic Motor System?

1 neuron

30

What is the target organ of the somatic motor system?

ALWAYS skeletal muscle