-
supraspinatus - attachments, action, nerve
- supraspinous fossa --> greater tubercle
- abduction
- suprascapuar n. (C4-C6)
-
infraspinatus - attch, act, nerve
- infraspinous fossa --> greater tubercle
- ER
- suprascapular n (C4-C6)
-
teres minor - attch, act, nerve
- lateral border of scapula (btwn teres major & triceps longhead) --> greater tubercle
- ER, weak adduction
- axillary n (C5, C6)
-
subscapularis - attch, act, nerve
- subscapular fossa --> lesser tuberosity
- IR
- subscapular nerve (C5, C6)
-
deltoid - attch, act, nerve
- lat third of clavicle
- acromion
- scapular spine
- -->
- deltoid tub on humerus
- ant portion: flex, IR, add
- med portion: abd
- lat portion: ext, ER, add
-
teres major attch, act, nerve
- inf angle of scap -->lesser tuberosity of humerus (teres minor goes to greater tub)
- add, IR, ext (same as latissimus dorsi)
- lower subscapular n (C5-C7)
-
thoracohumeral muscles as a group do waht?
- extension
- IR
- horiz adduction
- flexion
- (of humerus)
-
muscles of the thoracohumeral area
- latissimus dorsi
- pec major
-
latissimus dorsi attachments
- SP T7-T12
- inf angle of scapula
- 9-12th ribs
- posterior iliac crest
- --> floor of intertubercular groove of humerus
-
nerve and action of latissimus dorsi
- thoracodorsal n (C6-C8)
- handcuffs... IR, add, ext
-
pec major attachments
- medial half of clavical
- sternum & cotal carilages 1-6
- --> crest of greater tuberosity
-
pec major actions and nerve
- med and lat pectoral nerves (C5-T1)
- add, IR, flexion
(elsewhere there's more detail on clavicular vs sternocostal parts?)
-
four places that can send referred pain to the shoulder region
- cervical spine
- thoracic spine
- viscera
- myocardium
-
first line of defense if a shoulder is hypermobile?
taping!
-
FOOSH injury
fall on outstretched hand injury --- can cause a heap of damage, including a labrum tear. and mind you, the labrum is cartilaginous
-
how to tell the anatomical neck form the surgical neck?
- anatomical: more proximal - it's right under the head of humerus
- surgical: it's between the upper portion of the humerus and the shaft
(alphabetical!)
-
rel of glenoid fossa to head of humerus
glenoid is 1/2 as long and 1/3 as wide
little more than 1/3 of humerus contacts cavity at any time, so the stability is due to muscles, tendons, and capsule
-
head of humerus -- covered with what? faces which ways? name for this type of surface?
- hyaline cartilage
- sup, med, post
- convex obiod surface that approximates a spherical shape
-
glenoid cavity is covered in what? faces which way?
- hyaline cartilage (then the labrum?)
- lat, ant, slighly sup
- has a teardrop shape, narrower at the top, with a bit of the divot at the sup post side
-
goal of glenoid labrum
it's a fibrocartilaginous rim attached to margins of glenoid cavity to widen and deepen the cavity
-
glenohumeral ligaments
- sup, mid, inf -- they all run from ant scap by the fossa to the lesser (more anterior) tubercle, tho the inf band runs to the lower part of the anatomical neck, at obvious heights
- the sup one limits full adduction
- the middle one limits ER
- the inf one limits abd and ER (tho its posterior band limits IR)
but do think, if it limits this motion in the humerus, it limits a diff kind of motion in the humeral head...
-
coracohumeral ligament
from coracoid process, then down and lat to front of greater tubercle, blending w tendon of supraspinatus, helping hold the long head of the biceps within the joint
-
transverse humeral ligament
attaches greater and lesser tubercles, creating a tunnel through which the biceps long head tendon passes
-
axillary recess
inferior pouching (redundant fold) of the joint capsule btwn the teres minor and subscapularis
-
number of degrees of freedom of GH joint?
what are they?
-
how much flex and ext is possible at the GH joint
-
how much abd add is possible at hte GH joint
- abd 120
- add return to neutral
-
how uch ER and IR is possible at the GH joint
-
capsular pattern of GH joint
ER>abd>IR
-
resting pos of GH joint
- 55 degrees abd
- 30 degrees horizontal add
-
close-packed pos for GH joint
max abd and ER
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