ANATOMY - spinal nerves Flashcards by Jay Slater

how many cervical spinal nerves are there

7 cervical vertebrae but one above every vertebrae AND one below C7

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how many thoracic spinal nerves are there

where do they leave the spinal column

under each of the thoracic vertebrae (bc there are 8 cervical ones, one below c7)

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how many sacral spinal nerves are there

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how many coccygeal spinal nerves are there

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how many spinal nerve pairs are there

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where are roots/rootlets in relation to the spinal nerve

behind it (between spinal nerve and spinal cord)

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where are the rami in relation to the spinal nerve

in front of it

spinal nerve SPLITS into anterior and posterior rami

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what modality is in the anterior rami

where does it supply

mixed - motor and sensory

to most of body

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what modality is in the posterior rami

where does it supply

mixed - sensory and motor

posterior body wall

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what modality is in the anterior roots/rootlets

motor

bc Anterior want to get close to the Action

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what modality is in the posterior roots/rootlets

sensory

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what is the joining of anterior and posterior rami called

the spinal nerve

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by which categorization method do spinal nerves supply muscles

myotomes

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by which categorization method do spinal nerves supply skin sensation and somatic motor function

dermatomes

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shoulder and clavicle dermatome

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badge patch dermatome

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lateral forearm and thumb dermatome

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middle finger dermatome

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little finger dermatome

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medial forearm dermatome

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medial arm and top of chest (sternal angle) dermatome

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anterior and posterior trunk dermatomes

T2-T12 (L3 on back)

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nipple dermatome

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belly button dermatome

T10

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'hands in pockets' dermatome

lateral thigh dermatome

medial thigh and knee dermatome

L3 (three = knee)

medial calf (medial malleolus) dermatome

big toe and lateral calf dermatome

L5 (biggest number = 5 for the biggest toe)

little toe and heel dermatome

S1 (smallest number = 1 for smallest toe)

posterior leg dermatome

saddle dermatome

anal passage dermatome

is there a C1 dermatome

no bc no dorsal (posterior) roots

pubic symphysis dermatome

T12

xiphoid process dermatome

what are the 4 spinal nerve plexuses

cervical plexus brachial plexus lumbar plexus sacral plexus

which spinal nerves is the cervical plexus made up of

C1-C4

which spinal nerves is the brachial plexus made up of

C5-T1

which spinal nerves is the lumbar plexus made up of

L1-L4

which spinal nerves is the sacral plexus made u of

L5-S4

C5 myotome

shoulder abduction

C6 myotome

elbow flexion

C7 myotome

Elbow extension

C8 myotome

finger flexion

T1 myotome

finger abduction

L3 myotome

knee extension

L4 myotome

ankle dorsiflexion

L5 myotome

big toe extension

S1 myotome

ankle plantarflexion

S2 myotome

knee flexion

biceps reflex spinal nerve

supinator reflex spinal nerve

triceps reflex spinal nerve

knee reflex spinal nerve

ankle reflex spinal nerve

apart from dermatomes, what is the other skin innervation that we need to know

named nerves

what is the pneumonic for the named nerves of the head hence what are the named nerves of the head which spinal nerves supply these named nerves

little goats tread softly lesser occipital greater auricular (around the ear) transverse cervical supraclavicular C1-C4

what is the named nerve that supplies the skin just outside the ear

great auricular nerve

which named nerve supplies the littlefinger

ulnar

which named nerve supplies most of the palm of the hand (not little finger) and finger nails

medial

which named nerve supplies the dorsum of the hand (not little finger)

radial

which named nerve supplies most of the anterior thigh

femoral

which named nerve supplies most of the anterior calf

saphenous nerve (from the femoral)

which named nerve supplies most of the posterior lower limb

posterior cutaneous nerve of the thigh

if there is sensory damage to a nerve but motor function from it is fine, where is the problem

posterior rootlet/root (or above) damage

if there is sensory damage in more than one dermatome, where might the problem be

named nerve!

if you have established a sensory problem in 1 dermatome, what should you check

check all other dermatomes - to exclude it being a named nerve problem check associated myotome - to identify if its just sensory or motor problem too (whether the problem is before or after the spinal nerve and rami)

where does posterior rami of spinal nerves supply

the back

what is the lump in the posterior root (before it become spinal nerve) called

dorsal root ganglion

is dorsal anterior or posterior

posterior

is ventral anterior or posterior

which named nerve supplies first web space of foot only

deep fibular

ANATOMY - spinal nerves Flashcards

(73 cards)