Exam 3 Flashcards
(103 cards)
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