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Movements of the Glenohumeral Joint (Movements of the Glenohumeral Joint…
Movements of the Glenohumeral Joint
Movements of the Glenohumeral Joint
Extension
: Prime movers;
Deltoid
Assisted by,
Teres major, latissimus dorsi; long head of triceps brachii
Abduction
: Prime Movers;
Deltoid
(as a whole, but especially acromial part
Assisted by:
Supraspinatus
Supraspinatus
is particularly important in initiating movement' also, upward rotation of scapula occurs throughout movement , making a significant contribution
Flexion
: Main movers! Pectoralis Major; Deltoid;
Assisted by:
Coracobrachialis
From fully extended position to its own (coronal) plane, Sternocostal head of pectoralis major is a major force
Adduction
Prime movers:
Pectoralis major; Latissimus Dorsi
Assisted by:
Teres Major; long head of triceps brachii
In upright position and in absence of resistance, gravity is prime mover.
Medial Rotation
Subcapularis
Assisted by:
Pectoralis Majorl deltoid
; (the clavicular part);
latissimus dorsi; teres major
With arm elevated. "
synergists
" become more important than prime movers
Lateral Rotation
Infraspinatus
Assisted by:
Teres Minor; deltoid (spinal part)
With arm elevated. "
synergists
" become more important than prime movers
Tensors of articular capsule: Subscapularis: Infraspinatus
(
Simultaneously
)
Assisted by/
synergists
Supraspinatus;Teres minor
Rotator Cuff (SITS) muscles acting together; when "
resting
" their tonus adequately maintains integrity of joint
Resisting downward dislocation
(
shunt muscles
)
Primary movers from dependent positoin:
Deltoid (as a whole)
Synergists: Long head of triceps brachiil coracobrachialis; short head of biceps brachii