Section 5 Neuronal Properties and Spinal Nerves Flashcards Preview

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Flashcards in Section 5 Neuronal Properties and Spinal Nerves Deck (25):
1

Spinal Nerves

Paired. Part of the Peripheral Nervious System. Exit spinal cord at their corresponding vertebral level through the intervertebral foramina

2

Dorsal Root

Carries Sensory information

3

Dorsal Root Ganglion

1. Sensory from the periphery to spinal cord
2. Neurons are pseudounipolar
3. Dual branch axons
4. One branch to periphery, one toward grey matter
5. Fibers toward periphery leave through spinal nerve with motor fibers
6. Fibers leading to the spinal cord go through dorsal root

4

Ventral Root

Carries Motor Informaiton

5

Cervical root #'s

C1-C8

6

Thoracid root #'s

T1-T12

7

Lumbar root #'s

L1-L5

8

Sacral root #'s

S1-S4

9

Cervical Plexus

C1-C4

10

Brachial Plexus

C5-C8, T1
To upper extremities

11

Lumbar Plexus

T12, L1-L4

12

Sacral Plexus

L4-L5, S1-S4

13

Lumbosacral Trunk

L4-L5

14

Myotome

muscles innervated by one single spinal nerve or spinal segment

15

Spinal Nerve of Biceps

C5 Flexion of forearm

16

Spinal Nerve of Deltoid

C6 Shoulder abduction

17

Spinal Nerve of Triceps

C7 Elbow extension

18

Spinal Nerve of Quadriceps

L4 Knee extension

19

Spinal Nerve of Extensor Hallicus Longus

L5 Great Toe extension

20

Spinal Nerve of Peroneus Longus

S1 Foot Eversion

21

Dermatome

Area of skin innervated by one single spinal nerve or spinal segment

22

Reflexes

Biceps C5
Brachioradialis C6
Triceps C7
Patellar L4
Achilles Tendon S1

23

Grading system for Reflexes

0 Absent
1+ Hypoactive
2+ "Normal"
3+ Hyperactive without clonus
4+ Hyperactive with clonus

24

Manual motor testing

Muscle strength test rated at 5/5
a. Normal (5) withstand strong pressure
b. Good (4) withstands moderate pressure
c. Fair (3) holds test position against gravity but tolerates no additional pressure
d. Poor (2) moves through complete range in horizontal plan
e. Trace (1) slight contraction, but no visible movement of body part
f. Zero (0) complete lack of muscle contraction

25

dermatome test grade

+ = Hyperesthesia
N = Normal
- = Hypoesthesia