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ch4
shoulder girdle Exam 2
13
Medical
Undergraduate 3
10/18/2015

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Term
entire upper extremity depends upon what to serve as a base from which to function
Definition
shoulder girdle
Term
scapula & clavicle
Definition
move as a unit
clavicle's articulation w/ sternum is only bony link to axial skeleton
Term
scapulothoracic
Definition
-not a true synovial joint
– does not have regular synovial features
– movement depends on SC & AC joints
which allows the scapula to move
– supported dynamically by its muscles
– no ligamentous support
Term
Sternoclavicular(SC)
Definition
-multiaxial synovial joint (saddle)
-mvmts: in relation to manubrium, clavicle moves
-ligamentous support: sternoclavicular ligament, costoclavicular and interclavicular ligaments provide stabilty against superior displacement.
Term
acromioclavicular(AC)
Definition
-synovial joint-gliding
-20- to 30-degree total gliding & rotational
motion accompanying other shoulder girdle & shoulder joint motions
-supported by: coracoclavicular ligaments(conoid and trapezoid), acromioclavicular ligament
-often injured
Term
abduction (protraction)*
Definition
scapula moves laterally away from spinal column
Term
adduction (retraction)
Definition
Scapula moves medially toward spinal column
Term
downward rotation:
Definition
returning inferior angle
inferomedially toward
spinal column & glenoid
fossa to normal position
Term
upward rotation:
Definition
– turning glenoid fossa
upward & moving
inferior angle
superolaterally away
from spinal column to
assist in raising arm
Term
Depression:
Definition
– downward or inferior
movement of
scapula, as in
returning to normal position
Term
elevation
Definition
– upward or superior
movement of
scapula, as in
shrugging shoulders
Term
lateral tilt (outward tilt)
Definition
during abduction
scapula rotates about its vertical axis resulting in posterior mvmt of medial border and anterior mvmt of lateral border
Term
medial tilt (return from lateral tilt, inward tilt/
Definition
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