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Deltoideus (acromiodeltoid, spinodeltoid)
- origin: spine/acromion of scapula
- insertion: deltoid tuberosity of humerus
- action: flexes shoulder
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Infraspinatus
- origin: infraspinous fossa of scapula
- insertion: lateral side of greater tuberosity of humerus
- action: flexes shoulder/abducts limb at the shoulder
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Supraspinatus
- origin: supraspinous fossa of scapula
- insertion: greater tuberosity of humerus
- action: extends shoulder
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Subscapularis
- origin: subscapular fossa of scapula
- insertion: lesser tuberosity of humerus
- action: adducts limb/rotates forearm medially
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Teres major
- origin: caudal border of scapula
- insertion: teres major tuberosity of humerus
- action: flexes shoulder
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Triceps brachii (3 heads: long, medial, lateral)
- origin: long head:caudal border of scapula/ medial&lateral: proximal border of humerus
- insertion: olecranon of ulna
- action: extends elbow/ flexes shoulder
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Biceps brachii
- origin: supragelnoid tubercle of scapula
- insertion: ulna and radial tuberosities
- action: flexes elbow/ extends shoulder
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Brachialis
- origin: caudolateral aspect of proximal humerus
- insertion: ulnar and radial tuberosities
- action: flexes elbow
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lateral muscles of the scapula and shoulder
- deltoids (acromiodeltoid, spinodeltoid)
- infraspinatus muscle
- supraspinatus muscle
-
medial muscles of the shoulder
- subscapularis muscle
- teres major muscle
-
cranial muscles of the arm
- biceps brachii muscle
- brachialis muscle
-
caudal muscle of the arm
triceps brachii muscle
-
muscles that flex the shoulder
- latissimus dorsi
- deltoids (acromiodeltoid, spinodeltoid)
- infraspinatus
- teres major
- triceps brachii
-
muscles that extend the shoulder
- supraspinatus
- biceps brachii
- brachiocephalicus
-
muscles that flex the elbow
-
muscles that extend the elbow
triceps brachii
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