Shoulder Joint and ligaments Flashcards
shoulder has high degree of what, but is very what?
Shoulder has high degree of mobility, but is very unstable.
The coracohumeral ligament spans what bone of shoulder jt?
bicipital grove of humerus
coracohumeral ligament provides
anteroinferior stability of GH jt
GH ligament (ant, midd, and anteroinf bands) reinforces
anterior capsule and provides stability to shoulder jt in most planes of movement
coracohumeral ligament is located where?
coracohumeral ligament is located superior to GH jt
coracohumeral ligament protects what?
muscles, tendons, nerves and blood supply of this region and prevents superior dislocation of humeral head
Acromioclavicular ligament is major ligament that provides
stability to the AC jt
What ligament prevents superior dislocation of AC jt?
coracoclavicular ligament
What ligament helps strengthen the capsule of the sternoclav jt?
sternoclav ligament
The costoclavicular ligament connects what
first rib and clavicle
interclav ligament connects
2 clavicles and manubrium
location of subacromial bursa
lies betwqeen supraspinatus, deltoid tendons, acromion, allows gliding and cushioning of these structures specill yduring should abd
4 jts of shoulder
acromioclav, sternoclav, GH, scapulothoriacic jt
GH is what kind of jt?
bALL AND SOCKET
GH consists of what?
spherical head of humerus w/ small, shallow, and somewhat pear-shaped glenoid fossa of scapula.
Glenoid labrum is what?
of scapula that deepens the fossa and cushions against impact of humeral head during forceful movements
AC Jt is what?
a plane syn jt of the articulation of the acromion and the distal end of clavicle
AC jt moves in how many planes with what?
3 planes of motion with scapulothoracic motion
What articulation is the sternoclav jt?
Articulation of proximal clavicle w/ sternum and cartilage of first rib
SC jt is what kind of synovial jt?
saddle jt
The SC Jt moves how?
SC jt moves in sync w/ other 3 jts
SC jt provides ….
only bony connection between humerus and axial skeleton
SCPT JT is not a true
jt, but a functional (physiologcal) jt
SCPT JT is formed by the
articulation of scapula w/ thoracic cage.
Any movement of SCPT jt results in movement of
AC, GH, SC jt
What does SCPT jt provide?
mobility and stability for the orientation of glenoid fossa and humeral head for arm movements in all planes
Where is center of ROT of GH jt?
humeral head w/in glenoid fossa
describe scapulohumeral rhythm
full abd of arm requires simultaneus movement of GH and scapulothoraic jts (dual movement0
Scapulohumeral rhythm allows what?
Scapulohumeral rhythm allows a greater abd ROM, maintains optimal length-tension relationsjips of GH muscles, and prevents impingement btween greater tubercle of humerus and acromion.
Scapulohumeral rhythm makes arm elevation overhead possible how?
after 100 - 120 abd, upward rot of scapula frontal plane causes glenoid fossa of scapula to face upward = aqrm above head
