MSK Flashcards
C2
sleep area
occipital protuberance
C3
lateral/posterior neck
C4
shoulder pads
C5
acromioclavicular joint
C6
thumb sucker
C7
index finger
C8
little finger
T1
medial antecubital fossa
T2
lateral sternal line
T4
titties!
T10
umbilicus
L1
mid upper thigh
L2
mid anterior thigh
L3
mid medial thigh
L4
medial calf
L5
1st, 2nd, 3rd toes
S1
lateral 5th digit
S2
popliteal fosss
S3
ischial tuberosity
S4/S5
perineal area
brachial plexus: C5
abduct arm
brachial plexus: C6
flex forearm
brachial plexus: C7
extend forearm
brachial plexus: C8
flex fingers
brachial plexus: T1
spread fingers, hand muscles
what n is associated w. winged scapula
long thoracic
can be damage in axillary node dissections/abscess drainage

root of the long thoracic n
C5-C7
what is the SIT tubercle
greater tubercle of proximal humerus
impingement of the suprascapular n in the suprascapular notch can cause
paralysis of the supraspinatus and infraspinatus m

what muscles insert on the SIT tubercle
supraspinatus
infraspinatus
teres minor
the rotator cuff includes __
plus __
SIT muscles
subscapularis
C5 actions and associated muscles
abduction of humerus
external rotation of humerus
supraspinatus m
infraspinatus m
nerve roots and action of teres minor m
C5, C6 → axillary n
external rotation of humerus
nerve roots and action of subscapularis m
C5, C6
internal rotation of humerus
where does the subscapularis insert
lesser tubercle
the deltoid and teres minor are innervated by
axillary n
major abductor of the arm
deltoid
major flexor of the forearm
brachialis
what m is used to bench press, abduct, and bend over lateral raise
deltoid
impingement of the nerve in the suprascapular notch can cause paralysis of the (2)
supraspinatus m
infraspinatus m
rotator cuff tear can involve the __ tendon
supraspinatus
chronic rotator cuff tear can cause a space between the __
and the __
2/2 to __
head of the humerus
acromion
full thickness tear of supraspinatus tendon
what accounts for 50% of the area of the shoulder socket joint
glenoid labrum
what do you think when you hear: click with deep pain in a shoulder injury
glenoid labrum tear
summary if injuries associated w. rotator cuff muscles
impingement syndrome
chronic tear
glenoid labrum tear
most shoulder dislocations are __
and involve the __
anteroinferior
inferior glenohumeral ligament
most important stabilizing structure of the shoulder
inferior glenohumeral ligament

recurrent shoulder dislocations are 2/2 to __
glenohumeral instability
MOA for anterior shoulder dislocation
arm abducted and externally rotated
5 injuries that occur w. anterior shoulder dislocations
bankhart lesions
hill-sachs fracture
capsular tears
damage to inferior glenohumeral ligament
damage to axillary n
anterior glenoid labral injury and fx of the anterioinferior glenoid
bankhart lesion
fracture of the posterior superior humeral head
hill sachs fracture
carpal tunnel syndrome involves the __ n
median
3 sx of carpal tunnel syndrome
loss of thenar m fxn and mass
positive Tinel’s
tingling/burning in thumb, index, middle finger
what is tinel’s sign
tapping a finger on wrist elicits tingling/pain
flexor and supinator m of the forearm
biceps brachii
not the most powerful flexor tho
biceps brachii is innervated by the __ n
musculocutaneous
biceps brachii:
short head origin:
long head origin:
insertion:
short head origin: coracoid process of scapula
long head origin: supraglenoid tubercle of scapula
insertion: radial tuberosity
insertion of triceps m
olecranon process
triceps origin
olecranon process of ulna
triceps origin:
long head:
medial head:
lateral head:
long head: infraglenoid tubercle of scapula
medial head: posterior humerus
lateral head: posterior humerus
action of triceps
elbow extension
4 sites of humerus fx
surgical neck
midshaft
supracondylar
medial epicondyle
proximal humerus/surgical neck fx damages what structures
axillary n
posterior circumflex humeral a
mid-shaft humeral fx damages what nerve and artery
radial n
deep brachial a
distal humerus supracondylar fx involves what n and artery
median n
brachial a
medial epicondyle fx involves what n
ulnar
the sciatic n gives rise to the __ nerves (2)
common fibular/peroneal
tibial
the common fibular/peroneal n divides into the (2)
deep fibular/peroneal n
superficial fibular/peroneal n
the tibial n goes to the __ leg (2)
and is associated with __ action
posterior, medial
plantar flexion, inversion
if only the deep peroneal n is affected, __ will be lost,
but __ will be spared
dorsiflexion
eversion
fibular neck fx involves __ n damage
and results in __,
which is mediated by __ m
deep peroneal
foot drop
tibialis anterior
posterior nerves of the lower extremity __
the foot and __ the toes
plantar flex
flex
medial nerves of the lower extremity __ the foot
invert
fxn of the superficial peroneal n
foot eversion
fxn of the deep peroneal n
foot dorsiflexion
toe extension
4 types of injuries associated w. the brachial plexus
obstetric
trauma
lesions
fx of surgical neck (midshaft) of humerus
obstetric injury associated w. brachial plexus
Erb’s Palsy
Klumpke’s Palsy
MOI for Erb’s Palsy
traumatic vaginal delivery → baby’s anterior shoulder gets caught on mom’s pubic bone → shoulder dystocia → stretches upper brachial plexus trunks
MOI for Klumpke’s Palsy
traction injury during delivery → damage to C8-T1 → claw hand
Erb’s Palsy involves damage to __ nerve roots
Klumpke’s Palsy involves damage to __ nerve roots
Erb’s: C5/C6 (E for upper)
Klumpke’s: C8/T1 (K for lower)
5 lesions associated w. the brachial plexus
winged scapula
erb’s palsy
total claw hand
saturday night palsy
flattened deltoid
winged scapula involves damage to
C5, C6, C7 -> wings to heaven
Erb’s palsy involves damage to
C5, C6
total claw hand involves damage to
C8, T1
saturday night palsy (wrist drop) involves damage to
radial n → C5-C7
flattened deltoid involves damage to
C5, C6 → axillary n
fracture of the midshaft of the humerus damages the __ n
radial
n that mediates extension of hand, wrist, thumb, digits
radial
finger spread n
intrinsic m of hand
ulnar n
what is the law in ABOF the LAW
all muscles of the hand are supplied by the ulnar n EXCEPT ABOF the LAW muscles
what n are the ABOF the LAW muscles innervated by
median
what are the ABOF the LAW muscles
ABductor pollicis brevis
Opponens pollicis
Flexor pollicis longus/brevis
LAteral 2 lumbricals (index and middle finger)
3 PE tests for the hand
tata sign
froments sign
thumb to finger approximation
what is the tata sign
ability to flex MCP joints at the same time as extending IP joints
the tata sign involves the __ muscles
3rd and 4th lateral lumbricals
ability to spread fingers against resistance
froments sign
froments sign involves the __ m
adductor pollicis
thumb to finger approximation tests the __ muscles (2)
and __ n
flexor carpi ulnaris
flexor digitorum profundus
ulnar n
wrist drop is associated w. the __ n
radial
what bone does the hand articulate w. primarily
radius
the long flexors of the hand can also
adduct
which structures are commonly injured in knee injuries
menisci
MCL/LCL
ACL/PCL
capsule/synovial joint
rotational knee injuries involve the
menisci
pop and effusion knee injuries usually involve the
ACL
what is the terrible triad of knee injuries
ACL
MCL
MM
__ injury is mc than the terrible triad
LM
roots of the femoral n
L2-L4
5 muscles associated w. the femoral n
quadriceps femoris
patellar ligament
sartorius
iliopsoas
pectineus
the muscles innervated by the femoral n are associated w. the __ compartment,
except for the __, which is in the medial compartment
anterior
pectineus
fxn of the femoral n
knee extensors
hip flexors
roots of the obturator n
L2-L4
3 muscles of the obturator n
adductor longus, brevis, magnus
obturator externus
gracilis
the obturator n is associated w. the __ compartment
medial
fxn of the obturator n
adductors of femur
roots of the sciatic n
L4-S3
4 muscles associated w. the sciatic n
hamstrings:
biceps femoris
semitendinosis
semimembranosis
the sciatic n is associated w. the __ compartment
posterior
fxn of the sciatic n
hip extension
the femoral, obturator, and sciatic n all insert on the __
at the __
medial proximal tibia
pes anserinus (goosefoot)
foot drop is associated w. damage to __ nerves (3)
L5
sciatic
peroneal (fibular)
motor findings of L5 damage occur __ to the lesion and can involve weakness to
__ muscles (3)
ipsilateral
tibialis anterior
fibularis longus
extensor hallicus longus
aseptic necrosis of the talus can occur w. damage to the
posterior tibial a

what muscles surround the piriformis (3)
superior/inf gemelli
quadratus femoris
obturator internus/externus
gluteus muscles
piriformis syndrome involves compression of the __ n, which is located
__ to the piriformis m
sciatic
posterior
where is pain from piriformis syndrome felt
lower back
buttocks
parts of leg and foot
pain travels up and down the nerve
pain in piriformis syndrome can be accompanied by
numbness
weakness
clinical findings in the knee associated w. RA
panus formation → erosion of bone AND cartilage → hyperplastic synovial membrane, increased synovial fluid
major flexor of the forearm
brachialis