Musculoskeletal Part Two Flashcards
supraspinatus AND infraspinatus
nerve roots
innervation
NR: C4-C6
I: suprascapular
glenohumeral ligament stabilizes what part of the joint
anterior glenohumeral capsule
sternocleidomastoid nerve roots AND innervation
C1-C4
cervical spinal accessory
the rotator cuff muscles all stabilize the shoulder. in what direction do all of them specifically stabilize it
supraspinatus: superiorly
infraspinatus/TMinor: posteriorly
subscapularis: anteriorly
what happens to the clavicle during the first 90 degrees of shoulder abduction
clavicle elevates 35-45 degrees at the sternoclavicular joint
what other two muscles have the same function as the lats
teres major
subscapularis
what happens to the ulna during elbow flexion
supinates slightly
anconeous action
elbow extension
what levels at the thoracic spine do the superior AND inferior angle of the scapula cover
superior: T2
inferior: T7
as a group, what do the rhomboids, middle trap, and lower trap cause for the scapula
scapular retraction
where is the transverse humeral ligament located
over the biccipital groove
the coracoclavicular ligament covers what muscle
supraspinatus
articulation of humeroradial joint
distal end of humerus (capitulum)
with concave oval facet of proximal radius
teres minor action
shoulder ER
the UCL provides resistance to _____ forces
valgus
where is the elbow bursa located
over the olecrenon process
what occurs at 75 degrees of shoulder elevation and why
ER
prevents compression of greater tubercle against acromion
what does the glenoid labrum attach to
capsule superior and inferior
long head of biceps tendon superior
lattisimus dorsi:
nerve roots
innervation
NR: C5-C8
I: thoracodorsal
ratio of movement during elevation between GH and scapulothoracic
2:1
GH:ST
deltoid:
myotome
nerve roots
innervation
M: C5
NR: C5-C6
innervation: axillary nerve
what two structures is the subacromial bursa between
deltoid
capsule
the RCL provides resistance to ____ forces
varus
annular ligament purpose
protect radial head
in order to palpate the subacromial/subdeltoid bursa, what motion should be done
extend the humerus
how can the axillary artery be injured
compressed against the humerus (crutches)
what ligament acts as a retinaculum for long biceps tendon
transverse humeral ligament
is there more mobility or stability in the GH joint
lots more mobility than stability
what may happen if static stability of the GH joint is compromised
rotator cuff muscles fire and can cause subacromial impingement
do the rotator cuff muscles insert into the joint capsule
yes
serratus anterior:
action
nerve roots
innervation
A: protraction, upward rotation
NR: C5-C7
innervation: long thoracic nerve
when is the annular ligament most taut
the extremes or pronation and supination
what happens to the position of the elbow in extension
the ulna pronates slightly in extension
upper trapezius myotome AND innervation
C4
spinal accessory
articulation of humeroulnar joint
distal end of humerus (trochlea)
with proximal end of ulna
during shoulder elevation, what direction does the head of the humerus move
inferiorly
for 180 degrees of elevation, where does the first 30-60 degrees come from
GH
where is the elbow capsule thin
anterior and posterior
what does the quadrate ligament do
reinforces inferior joint capsule
when is sternoclavicular joint injured
following injury to AC joint and clavicle
where can the axillary artery be palpated
lateral wall of the inerior part of the scapula
purpose of coracohumeral ligament
reinforce biceps tendon
reinforce superior capsule
prevent caudal (downward) dislocation of humerus
what type of cartilage is associated with the sternoclavicular joint
fibrocartilage
out of 180 degrees of elevation, where does 120 degrees of movement come from
GH
main contributor to stability of the elbow
articulation between trochlea (humerus) and trochlear fossa (ulna)
what is the elbow capsule continuous with
UCL medially
RCL laterally
pec major/pec minor nerve roots AND innervation
C5-T1
medial/lateral pectoral nerves
purpose of coracoclavicular ligament
stabilizes AC joint
prevents upward displacement of humeral head
coracobrachialis:
action
nerve roots
innervation
A: shoulder flexion & adduction
NR: C6-C7
I: Musculocutaneous
