Exam 3 Flashcards
this joint attaches the upper appendicular skeleton to the axial skeleton
sternoclavicular joint
this increases the range of motion of the shoulder joint
scapulothoracic movement
joint responsible for the most movement of the scapula against the rib cage.
diarthodial with 3 degrees of freedom
sternoclavicular joint
gliding diarthodial joint that connects acromion and clavicle
acromioclavicular joint
what happens during scapular abduction
the medial border rotates posteriorly and the lateral border rotates anteriorly (this is knows as internal rotation)
what happens during scapular adduction
medial border rotates anteriorly and the lateral border rotates posteriorly (external rotation)
Upward rotation of the scapula
bottom rotates up laterally
downward rotation of the scapula
bottom rotates down medially
elevation of scapula
scapula up
depression of scapula
scapula down
during shoulder extension what happens to the scapula
anterior tilting
during shoulder flexion what happens to the scapula
posterior tilting
what nerves innervate the muscles of the shoulder girddle
cervical plexus and brachial plexus
what muscles produce actions on the scapula
trapezius
levator scapulae
rhomboids
serratus anterior
pectoralis minor
subclavius
Trapezius
Major Actions
Upper fibers
Middle fibers
Lower fibers
Upper fibers- elevation, upward rotation of scapula
Middle fibers - elevation, upward rotation and adduction of the scapula
Lower Fibers - depression, adduction and upward rotation of scapula
Levator scapulae
Major action
Assists with
Major action - Elevation of scapula
Assists with - downward rotation and adduction
Rhomboids
Major actions
Elevation, adduction and downward rotation of the scapula
Serratus Anterior
major actions
abduction and upward rotation of scapula
Pectoralis minor
major actions
minor actions
Major - abduction and depression of scapula
Minor - downard rotation
Subclavius
Major actions
Stabilize SC joint
Depression
Abduction of scapula
diarthrodial ball and socket joint that permits movement in all 3 planes
glenohumeral joint
what stabilizes the gh joint statically
ligaments that surround the joint capsule
what stabilizes the GH joint dynamically
skeletal muscles that cross the joint
restricts the end ROM for external rotaion, extension, abduction and horizontal abduction of the GH joint
Medial Glenohumeral Ligament
Anterior aspect:Restricts end ROM for external rotation, extension, abduction and horizontal abduciton of GH joint
Posterior aspect: resticts end ROM for internal rotation, flexion, adduction and horizontal adduction of the GH joint
Inferior glenohumeral ligament
what are the main dynamic stabilizers of the GH joint
rotator cuff muscles
sagittal plane movement of GH joint with ROM
Flexion (90 degrees without help from scapula and 180 with help) and extension (60 degrees)
frontal plane movement of GH joint with ROM
abduction (90 without scapula and 180 with scapula) and adduction (0 without scapula and 75 with scapula)
Transverse plane movement of GH joint with ROM
Internal rotation (90 degrees) and external rotation (90 degrees)
special frontal plane movement of GH joint with ROM
Horizontal abduction and horizontal adduction
180 total from having arm straight out (0-130 adduction and 45 for abduction)
what plexus innervates the gh joint
brachial plexus
Deltoid Anterior fibers
Major actions
Abduction, flexion. horizontal adduction, internal rotation
Deltoid middle fibers
major actions
abduction
Deltoid posterior fibers
major actions
abduction
extension
horizontal abduction
external rotation
Pectoralis major upper fibers
major action
internal rotaion
horizontal adduction
Pectoralis major lower fibers
major actions
internal rotaion
horizontal adduction
adduction
Latissimus dorsi
major actions
adduction
extension
internal rotation
horizontal abduction
Teres major
major actions
internal rotation
adduction
extension
Coracobrachialis
major actions
flexion
adduction
horizontal adduction
Rotator cuff muscles
subscapulairs
infrapinatus
teres minor
supraspinatus
subscapularis
major action
internal rotaion
Stabilize GH joint