PTFE NM Flashcards
in the cervical spine, nerves exit _ same number vertebrae
- above
in thoracic and lumbar spine, nerves exit _ same number vertebrae
- below
UE myotomes
- C1/C2: neck flexion, extension
- C3: neck lateral flexion
- C4: shoulder elevation
- C5: shoulder abduction
- C6: elbow flexion and wrist extension
- C7: elbow extension and wrist flexion
- C8: thumb extension
- T1: abduction/adduction of hand intrinsics
LE myotomes
- L1/L2: hip flexion
- L3: knee extension
- L4: ankle df
- L5: great toe extension
- S1: ankle PF and EV
- S2: knee flexion
- S3: anal wink
dermatomes
axillary nerve
- C5-6
- deltoid, teres minor
- sensory for proximal lateral arm
musculocutaneous nerve
- C5-7
- coracobrachialis, brachialis, biceps
- sensory for lateral forearm
long thoracic nerve
- C5-7
- serratus anterior
dorsal scapular nerve
- C5
- rhomboids, levator scapulae
suprascapular nerve
- C5-C6
- supraspinatus, infraspinatus
neuropraxia
- “it’s coming backsia”
- transient block from stretch/pressure
- pain, weakness, numbness, no muscle wasting
- recovery: minutes to days
axonotmesis
- nerve preserved but axons damaged
- Wallerian degeneration
- pain, complete sensory/motor/symp loss w/ muscle wasting
- recovery: 1 inch/month or 1 mm/day
neurotmesis
- total cut, scarred, severe/prolonged compression
- no pain w/ muscle wasting -> complete loss
- recovery: months, only with surgery
medial scapular winging due to
- serratus anterior weakness
- strengthen w/ push up plus
lateral scapular winging
- due to damage to traps or rhomboids
radial nerve
- C6-T1
- A: abductor policis longus
- B: brachioradialis
- E: extensors
- A: anconeus
- S: supinator
- T: triceps
- posterior interosseous nerve - muscular branch for ext, sup, APL
- sensory over dorsal arm and forarm, dorsal hand, 1st web space for thumb
damage to what nerve causes wrist drop
- radial nerve
crutch use can cause injury to what nerve
- radial n
midshaft humeral fx most likely to damage what nerve
- radial nerve
PIN syndrome
- purely motor loss of finger extension
median nerve
- C5-T1
- 1/2 L: lumbricals
- O: opponens pollicis
- A: abductor pollicis brevis
- F: flexors - radial side
- P/P: pronators - quadratus and teres
- sensory for lateral hand (1st 3 digits and half of 4th)
- anterior interosseous nerve - flexor pollcisi longus, tip to tip pinch grip
ape hand
- thenar wasting
- d/t median nerve damage
anterior interosseous nerve syndrome
- inability to make OK sign - median nerve
- tip to tip pinch grip w/ FPL and FDP
- compensate w/ adductor pollicis (ulnar n)
hand of benediction
- median nerve lesion
- attempting to make a fist, fingers 1-3 do not flex
- d/t weakness of flexor digitorum superficialis and flexor digitorum profundus on radial side - innervated by median n
- NOT to be confused w/ ulnar claw - similar presentation but stuck d/t ulnar nerve palsy
ulnar nerve
- C8-T1
- M: medial 2 lumbricals (3&4)
- A: adductor pollicis
- F: flexors - ulnar side
- I: interossei - dorsal
- A: abductor digiti minimi
- sensory for little finger and medial half of 4th digit
froment’s sign
- ulnar nerve
- testing adductor pollicis (ulnar n) ability to key grip
- froment’s (+) - compensating w/ FPL (median n)
ulnar lesion hand
- ulnar claw
- loss of lumbricals 3-4 that should flex MCP
- hand at rest in MCP hyperextension and DIP and PIP flexion
erb’s palsy
- upper brachial blexus injury (C5-6)
klumpke’s palsy
- lower brachial plexus injury
- C7-T1
humeral condylar fractures result in _ n damage
- lateral condylar - radial n
- medial condylar - median n
no tip to tip pinch of 1st-2nd fingers is
anterior interosseous syndrome (median nerve)
a disc herniation is L4-L5 creates what symptoms
- L5 symptoms
femoral nerve
- L2-4
- Qu: quads
- I: iliopsoas
- P: pectineus
- S: sartorius
- sensory to anterior and medial thigh, medial knee, proximal leg
- saphenous nerve - branch of femoral, sensory
obturator nerve
- L2-4
- “Hello obturator”
- medial compartment - adductor longus/brevis, gracilis, adductor magnus, obturator externus
- sensory to small area on medial thigh/groin