Axio/calv/scap-humeral actions

lat dorsi

adduction, medial rotation, extension

pec major

adduction, medial rotation, flexion

deltoid

abduction

deltoid anterior

abduction, flexion, internal rotation

Deltoid middle

abduction (m)

Deltoid posterior

abduction, extension, external rotation

teres major

adduction, medial rotation, extension of GHJ

coracobranchailis

flexion, adduction

biceps

GHJ flexion, elbow flexion, forearm supination

triceps

extension of shoulder and elbow

asc-humeral

primary movers of GHJ
flexion/extension, abduction/adduction, medial/lateral rotation of GHJ

Rotator cuff action

rotate humerus

rotator cuff function

stabilises the GHJ with medial force

supraspinatus

external rotation (and abduction but doesnt initiate)

infraspinatus, teres minor

external rotation of humerus to stabilise GHJ

Subscapularis

internal rotation to stabilise GHJ