shoulder Flashcards
The shoulder complex is made up of what 5 structures?
Sternum
Clavicle
Ribs
Scapula
Humerus
What is the shoulder trade-off?
Great ROM
Unstable joint (bc shape)
Ant surface of clavicle is convex ___ and concave ___
Medially
Laterally
How is the clavicle oriented anatomically?
Slightly above horizontal plane and ~20 degrees posterior to frontal plane
Angles of scapula (3)?
Superior, inferior, lateral
Borders of scapula (3)?
Superior, lateral, medial
What is the scapular plane?
Scapula angled superiorly ~4 degrees (horizontal plane) and anteriorly 35 degrees (frontal plane)
What is retroversion of head of humerus?
Rotated posteriorly ~30 degrees w/in horizontal plane
Do we normally have 65 degrees of humeral retroversion?
No, it de-rotates as age (~16-20 y.o.)
What musc attaches to lesser tubercle?
Subscapularis
What musc attaches to greater tubercle?
Upper facet: supraspinatus
Middle: infraspinatus
Lower: teres minor
What musc attaches to bicipital groove?
Long head tendon of biceps brachii (and latissimus dorsi at floor)
Which joint is a true joint?
SC (sternoclavicular) joint
What type of joint is the SC?
Saddle (concave and convex surfaces)
What musc add stability to the SC joint?
Ant: SCM
Post: sternohyoid and sternothyoid
Inf: subclavius
What tissues stabilize the SC joint?
Ant and post sternoclavicular lig
Interclavicular lig
Costoclavicular lig
Articular disc
T/F: the ligaments that stabilize the SC joint through all motions
F: except downward depression
Mvt of clavicle
Elev/dep
Prot/Ret
Ant/post rot
Elev/dep of SC occur in which plane?
Frontal (parallel) (ant, post axis of rot)
___ degrees of elev and ___ degrees of dep
35-45
10
Elevation of SC roll and glide
Roll sup
Glide inf
Depression of SC roll and glide
Roll inf
Glide sup
Pro/ret of SC occur in which plane?
Horiz (vertical axis of rot)
T/F: there is ~15-30 degrees of port/ret
T