Ch. 5: Bones and Joints of Shoulder Girldle Flashcards
Bones of shoulder girdle
Clavicle, scap, humerus (not part of the shoulder girdle proper but depends on the girdle for full motion)
The only skeletal attachment of the shoulder girdle to the thorax is the _____
Sternoclavicular joint (SC joint)
upward tip of scap is also known as _____
anterior tilt
the superior transverse scap ligament does not pass a ______
joint
which joint is not a true joint
scapulothoracic joint (ST)
there is no posterior connection of the upper extremity to the thorax, instead it relies primarily on _____ _____
muscular stability
what’re the articulating surfaces of the glenohumeral joint
glenoid fossa of scap and head of humerus
whats the classification of the glenohumeral joint
multi axial, synovial, ball and socket
what’re the mvts of the glenohumeral joint in the sagittal plane. axis?
flexion/extension
medial-lateral axis
what’re the mvts of the GH joint in the transverse plane. axis?
horizontal abduction/adduction
vert. axis
what mvts of GH JT occur in the frontal plane. axis?
adduction and abduction
ANT/POST axis
INT/EXT ROT’N of GH JT occurs in what plane and axis
no plane, mechanical axis of humerus
the 5 ligs. in GH JT
capsule, GH lig., coracohumeral lig., transverse humeral lig., and the coracoacromial lig.
3 bursae and labrum of GH JT
GH labrum, subdeltoid bursa, subacromial bursa, subscapular bursa
the GH capsule attaches where on the humerus and scap
anatomical neck of humerus and circumference of the glenoid fossa
when is the axillary recess of the GH JT capsule taut and loose
taut: arm if full abduction
loose: arm if full adduction
where is the axillary recess
inferior aspect of the GH JT capsule
the tendons of the supraspinatus, infraspinatus, teres minor, and subscapularis ______ with the GH JT capsule
blend
location and func. of the glenoid labrum
forms a lip around the glenoid fossa to deepen it. Increases congruency b/w opposing bones
3 feats. of GH lig.
partially capsular, on the ANT surface of JT, Z-shaped with 3 bands, limits EXT ROT’N and horizontal abduction
3 feats. of the coracohumeral lig.
extracapsular, 2 bands (SUP and INF), supports dependent arm against gravity
3 bands of the GH lig
SUP, middle, and INF
2 feats. of the transverse humeral lig.
extracapsular, achors the long head of biceps tendon within intertubercular sulcus
2 feats of the coracoacromial lig
extracapsular, forms portion of the roof of the subacromial arch and therefore limits elevation of the humerus
where is the subdeltoid bursa
sits b/w acromion, PROX humerus, and deltoid
where is the subacromial bursa
b/w acromion and supraspinatus tendon
where is the subscapular bursa
b/w glenohumeral lig./anterior JT capsule and subscapularis tendon
articulating surfaces of AC JT
acromial facet of clavicle and clavicular facet of acromion (medial acromion)
structural and functional classifications of AC JT
S: non-axial, plane, synovial
F: diarthrodial
mvts of AC JT permitted in frontal plane
SUP/INF scap ROT’N,
scap. elevation and depression
mvts of AC JT permitted in sagittal plane
upward tip of scap. (ANT tilt)
occurs in flexion of humerus
mvts of AC JT in transverse plane (roughly)
scap. protraction and retraction
Ligs. of the AC JT
capsule, acromioclavicular lig, coracoclavicular ligs (conoid and trapezoid), SUP transverse scapular lig
how many bursae involved in AC jt
none
feats of the AC jt capsule
relatively weak, disc within (usually gone by 40 yrs)
feats of the superior transverse scapular lig
extracapsular, doesn’t cross a jt, spans suprascapular notch
feats of the acromioclavicular lig
extracapsular, INF and SUP bands, limits one bone over riding another
feats of coracoclavicular ligs
conoid lig attaches to the clav. more medially, trapezoid lig attaches to clav more laterally, extracapsular, helps disperse force in FOOSH
Whats a FOOSH
Fall Onto an OutStretched Hand
articulating surfaces of the sternoclavicular JT
(SC JT)
sternal facet of clavicle,
clavicular facet of manubrium (superolateral manubrium), costal cartilage of rib 1
classification of SC JT
S: biaxial, saddle, synovial
F: Diarthroidal
mvts. permitted of SC Jt
clav. elevation/depression (frontal/AP axis),
clav. PROTR/RET (transverse/vert. axis),
clav. ROT’N (no plane/mech. axis of clav.)
ligaments of SC JT
Capsule, sternoclavicular lig, costoclavicular lig, interclavicular lig
feats of interclavicular lig
extracapsular, spans sternal notch, limits SUP/INF clavicular displacement
feats of costoclavicular lig
extracapsular, goes from costal cartilage of rib 1 to INF clavicle (impression for costoclavicular lig), limits clav. motion over 90 degrees GH abduction, clav. elevation, RET, and PROTR
feats of sternoclavicular lig
extracapsular, ANT/POST bands, limits ANT/POST clavicular mvt.
SC capsule features
intracapsular disc (attached superiorly to clav. and inferiorly to costal cartilage), disc divides the JT space into 2 (MED/LAT JT spaces), func. of disc —–> shock absorption
feat of the scapular thoracic joint
not a true joint
which end of clav. is more bulbous and circular
sternal end
what mm is the INF groove on the clav. for
subclavius
