Clinically relevant anatomy of spinal nerves Flashcards Preview

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Flashcards in Clinically relevant anatomy of spinal nerves Deck (37):
1

What is contained within the anterior horn of the spinal cord?

Motor cell bodies

2

Somatic general sensory symptoms

Neuralgia
Paraesthesia
Anaesthesia
Hyperaesthesia
Thermal
Ataxia

3

Somatic motor symptoms

Muscle stiffness, tightness or spasm
Reduced tone or hypotonia
Reduced power
Ataxia

4

Common upper limb and trunk dermatomes

C2 - back of scalp and adams apple
C3 - back of neck and jugular notch
C4 - clavicle and shoulder tip
C5 - regimental badge area
C6 - thumb
C7 - middle finger
C8 - little finger
T1 - middle forearm
T2 - medial arm and sternal angle
T4 - nipple
T10- umbilicus
T12 - pubic symphysis

5

Common lower limb dermatomes

L1 - groin
L2 - anterior thigh
L3 - anterior knee
L4 - medial malleolus
L5 - dorsum of foot
S1 - heel
S2 - posterior knee
S3 - buttock
S4 - perineum
S5 - perianal skin

6

What does dermatomal testing allow you to check the integrity of?

Dorsal rootlets
Dorsal roots
Spinal nerve

7

What does a dermatomal and myotomal indicate a problem with?

Spinal nerve

8

Do posterior rami form plexuses?

No - anterior rami

9

Do T2-T12 form a plexus?

No - they form the intercostal nerves to supply the anterolateral trunk wall and the subcostal nerve

10

Cervical plexus

Little, Goats, Tread, Softly
Lesser occipital nerve
Greater auricular nerve
Transverse cervical nerve
Supraclavicular nerve

11

Where does the lesser occipital nerve supply?

Skin posterior to the external ear

12

Where does the great auricular nerve supply?

Skin over angle of mandible and external ear

13

Where does the transverse cervical nerve supply?

Skin over anterior neck

14

Where does the supraclavicular nerve supply?

Skin over the clavicle and shoulder tip

15

What is the nerve point of the neck?

Where sensory nerves of the cervical plexus converge to pass from superficial to deep fascia
Found at the midpoint of the posterior border of the SCM

16

Which nerve supplies the anatomical snuff box?

Cutaneous branch of the radial nerve

17

Which anterior rami will refer pain from the myocardium?

T1 and T2

18

Somatosensory part of brain?

Postcentral gyrus in the parietal lobe

19

Which ascending track is for pain?

Spinothalamic

20

What does the cervical plexus of C1-4 supply?

Neck postural and strap muscles
Diaphragm

21

What does the brachial plexus of C5-T1 supply?

Muscles of upper limb
Extrinsic back muscles

22

What do the T2-L3 motor axons supply?

Postural back muscles via posterior rami
Intercostal muscles via anterior rami
Anterolateral abdominal wall muscles

23

What does the lumbosacral plexus of L1-S4 supply?

Muscles of lower limb
Perianal skeletal muscles

24

What is the C5 myotome?

Shoulder abduction via deltoid muscle

25

What is the C6 myotome?

Elbow flexion via biceps brachii

26

What is the C7 myotome?

Elbow extension via triceps brachii

27

What is the C8 myotome?

Finger flexion via flexion digitorum superficialis

28

What is the T1 myotome?

Finger abduction via dorsal interossei

29

What is the L3 myotome?

Knee extension via quadriceps femoris

30

What is the L2 myotome?

Hip flexion via psoas major and iliacus

31

What is the L4 myotome?

Ankle dorsiflexion via tibialis anterior

32

What is the L5 myotome?

Great toe extension via extensor hallucis longus

33

What is the S1 myotome?

Ankle plantarflexion via gastrocnemius

34

What is the S2 myotome?

Knee flexion via biceps femoris

35

What does an upper motor neurone lesion result in?

Spasticity

36

What does a lower motor neurone lesion result in?

Flaccidity

37

How can spinal reflexes be tested?

C5,6 = biceps brachii
C6 = brachioradialis
C7 = triceps brachii
L3 = knee jerk
S1 = ankle jerk