Lecture 6- spinal nerves Flashcards by Caitlyn Griffin

how many pairs of spinal nerves are there

How well did you know this?

Not at all

Perfectly

how many spinal nerves in the cervical region are only motor

1
C1

How well did you know this?

Not at all

Perfectly

how many spinal nerves are in each region

cervical 8
thoracic 12
lumbar 5
sacral 5
coccygeal 1

How well did you know this?

Not at all

Perfectly

what is the endoneurium

continuous of pia mater wrappring around a single axon

How well did you know this?

Not at all

Perfectly

what is perineurium

continuous of arachnoid mater wrapping around bundles of axons

How well did you know this?

Not at all

Perfectly

what is epineurum

continuous of dura mater wrapping around bundles of fasicles

How well did you know this?

Not at all

Perfectly

how do peripheral nerves receive blood supply

plexus of arterioles follow the nerves

How well did you know this?

Not at all

Perfectly

what is a neuropraxia injury

compression injury with intact axons

How well did you know this?

Not at all

Perfectly

what is an axonotmesis injury

tear of axons

How well did you know this?

Not at all

Perfectly

what is a neurotmesis injury

tear of whole fascicle/nerve

How well did you know this?

Not at all

Perfectly

what is the difference between axonotmesis vs neurotmesis prognosis

axon- intact endo, good chance of recovery

neuro- disrupted endo, peri, and/or epi, poor chance of recovery

How well did you know this?

Not at all

Perfectly

within the thoracic sp n, what does the dorsal ramus breakdown into

medial and lateral branch

How well did you know this?

Not at all

Perfectly

within the thoracic sp n, what does the ventral ramus breakdown into

lateral and anterior cutaneous
muscular branch

How well did you know this?

Not at all

Perfectly

what does the medial branch of the dorsal ramus innervate in the thoracic region

vertebral disc, facet jts, back m and skin

How well did you know this?

Not at all

Perfectly

what does the lateral branch of the dorsal ramus innervate in the thoracic region

mainly m
slightly skin

How well did you know this?

Not at all

Perfectly

what does the lateral cutaneous branch of the ventral ramus innervate in the thoracic region

anterior and posterior branch

How well did you know this?

Not at all

Perfectly

what does the anterior cutaneous branch of the ventral ramus innervate in the thoracic region

lateral and medial branch

How well did you know this?

Not at all

Perfectly

what does the muscular branch of the ventral ramus innervate in the thoracic region

intercostals, serratus posterior, and abdominal wall muscles

How well did you know this?

Not at all

Perfectly

dermatome for the ASIA scale is testing what

segmental distribution along a spinal n
crude touch and sharp pain by Ad

How well did you know this?

Not at all

Perfectly

if we are assessing the trunk dermatome, what spinal nerves are we testing

ventral and dorsal rami

How well did you know this?

Not at all

Perfectly

if we are assessing the neck or extremities dermatome, what spinal nerves are we testing

peripheral n from plexus formed by ventral rami

How well did you know this?

Not at all

Perfectly

what nerves make up the cervical plexus for cutaneous innervation

lesser occipital- C2
greater auricular C2-3
transverse cervical C2-3
supraclavicular C3-4

How well did you know this?

Not at all

Perfectly

what rami makes up the cervical plexus

ventral rami

How well did you know this?

Not at all

Perfectly

where is the greater auricular n

mandibular angle

How well did you know this?

Not at all

Perfectly

where does the supraclavicular n exit

prox 1/3 of post SCM

where does the greater occipital n come from

C2 and dorsal rami

what makes up the muscular innervation of the cervical plexus

C1 to gleniohyoid and thyrohyoid m from CN XII ansa cervicalis- superior (C1), inferior (C2-3) phrenic C3-5

what muscles are innervated by ansa cervicalis

infrahyoid neck m

what rami makes up the brachial plexus

ventral rami

what is the innervation for the superior trunk

C5-6

what is the innervation for the middle trunk

what is the innervation for the inferior trunk

C8-T1

what seperates C8 and T1 in the inferior trunk of the brachial plexus

1st rib

True/false only 2 out of the 3 trunks give out an anterior/posterior division

false all 3 give out an anterior/posterior division

what divisions makes up the lateral cord of the brachial plexus

anterior division of superior/middle trunk

what divisions makes up the medial cord of the brachial plexus

anterior division of inferior trunk

what divisions makes up the posterior cord of the brachial plexus

all posterior divisions

what nerves are given out from the superior trunk

dorsal scap C4/5 long thoracic C5-7 suprascapular C5-6 n to subclavius C5-6

what m are innervated by dorsal scapular n

levator scapulae and rhomboids

what m are innervated by long thoracic n

serratus anterior

what m are innervated by suprascapular n

supra and infraspinatus

what m are innervated by n to subclavius

subclavius

what nerves come off the lateral cord

lateral pectoral C5-T1 musculocutaneous C5-7 branch to median C5-7

what are the nerve roots for the lateral cord

C5-7

what nerve is the bridge between lateral and medial cord

lat pectoral n

what m are innervated by lat pectoral n

pec major

what m are innervated by musculocutaneous

coracobrachialis C5-6 brachialis C5-6 lat antebrachial cutaneous n

what m receives innervation from both musculocutaneous (c5-6) and radial n (C7)

brachialis

what n gives the lat forearm cutaneous innervation and what cord does it stem from

lat antebrachial cutaneous n lat cord

what are the n roots for the medial cord

C8-T1

what nerves stem from the medial cord

medial pectoral n C5-T1 med brachial cutaneous med antebrachial cutaneous ulanr n branch to median

what m are innervated by medial pectoral n

pec major and pec minor

what is the cutaneous innervation for the ulnar n

dorsal and palmar side last 1.5 digits

what forearm m are innervated by the ulanr n

flexor carpi ulnaris 1/2 flexor digitorum profundus

what hand m are innervated by the ulnar n

palmaris brevis ulanr 2 lumbricals flexor pollicis brevis interossei adductor pollicis ABD digiti minimi flexor digiti minimi opponens digiti minimi

what forearm m are innervated by median n

pronator teres flexor carpi radialis palmaris longus flexor digitorum superficialis flexor pollicis longus 1/2 flexor digitorum profundus pronator quadratus

what hand m are innervated by median n

ABD pollicis brevis flexor pollicis brevis opponens pollicis radial 2 lumbricals

what is the cutaneous innervation for the median n

radial palmar side of first 3.5 digits dorsal DIP

what nerve roots are the posterior cord made of

C5-T1

what nerves stem from the posterior cord

upper subscapular C5-6 middle supscapular/thoracodorsal C6-8 lower subscapular C5-6 axillary C5-6 radial n C5-T1

what m are innervated by upper subscapular n

subscapularis

what m are innervated by middle subscapular/thoracodorsal

lat dorsi

what m are innervated by lower subscapular

subscapularis and teres major

what m are innervated by axillary n

deltoid teres minor

what cutaneous innervation does the axillary n give off

shoulder girdle along deltoid

what arm/elbow m are innervated by radial n

triceps brachioradialis anconeus supinator

what forearm m are innervated by radial n

ABD pollicis longus EXT pollicis brevis ECRL/B EXT pollicis longus EXT digitorum EXT indicis EXT digiti minimi EXT carpi ulnaris

what rami makes up the lumbar plexus and directly supplies which n

ventral T12-L4 iliohypogastric T12-L1 ilioinguinal L1 gentifemoral L1-2

what nerve roots make up the anterior and posterior divisions of the lumbar plexus

L2-4

what are the nerves that make up the anterior division of the lumabr plexus and its distribbution

obturator L2-4 lumbosacral trunk L4-5 medial thigh

what are the nerves that make up the posterior division of the lumbar plexus and its distribution

lat femoral cutaneous L2-3 femoral L2-4 lateral and anterior thigh

what m are innervated by obturator n

pectineus obturator externus adductors gracilis

what are the functions of the m innervated by the obturator n

hip ADD/IR or ER= pectineus and obturator externus knee FLX/IR= gracilis

what m are innervated by femoral n

iliopsoas sartorius pectineus quadriceps

what are the functions of the m innervated by the femoral n

hip FLX/ER knee EXT/IR

what n is given out to provide cutaneous innervation for the medial leg to foot arch

femoral n that gives off saphenous n

what n roots make up the sacral plexus

L4-S3

what nerves make up the anterior/ventral division of the sacral plexus

tibial L4-S3 pudendal S2-4 pelvis splanchnic S2-4

what nerves make up the posterior/dorsal division of the sacral plexus

common fibular L4-S2 sup gluteal L4-S1 inf gluteal L5-S2

what cutaneous innervation does the sacral plexus give out

post femoral cutaneous S1-3

what makes up the sciatic n

common fibular L4-S2 tibial L4-S3

what m are innervated by sup gluteal n

gluteus medius gluteus minimus tensor fasciae latae

what m are innervated by inf gluteal n

gluteus maximus

what thigh m are innervated by common fibular n

bicep femoris short head

what leg m are innervated by superficial common fibular n

fibularis longus/brevis

what leg m are innervated by deep common fibular n

tib anterior EXT digitorum longus EXT hallicus longus fibularis tertius

what are the functions of the m innervated by common fibular n

knee FLX/ER ankle/foot DF/INV/PF/EVE/toe ext

what is the cutaneous innervation given off by the common fibular n

superficial- lat leg/dorsum foot deep- dorsum foot between 1 and 2 toes

what m are innervated by tibial n

HS (except bicep femoris short head) gastroc soleus post tib all foot intrinsics

what are the functions of the m innervated by tibial n

hip EXT knee FLX/IR/ER ankle/foot PF/INV/ADD/toe flx

what is the cutaneous innervation of the tibial n

post leg to lat foot by sural n sole

what branches make up the sural n

both common fibular and tibial n branches

what is the difference between radiculopathy vs peripheral neuropathy

rad- segmental distribution with mutiple sp n, less common peri- localized region of a single sp n, very common

where does C1 spinal n run

between occiput and atlas