Scapulohumeral Muscles Flashcards
Deltoid - Origin
Lateral third of clavicle
Acromion and spine of scapulae
Deltoid - Insertion
Deltoid tuberosity of humerus
Deltoid - Innervation
Axillary nerve (C5, C6)
Deltoid - Action(s)
Clavicular (anterior) part – flexes and medially rotates shoulder joint
Acromial (middle) part – abducts shoulder joint
Spinal (posterior) part – extends and laterally rotates shoulder joint
Supraspinatus - Origin
Supraspinous fossa of scapula
Supraspinatus - Insertion
Superior facet of greater tubercle of humerus
Supraspinatus - Innervation
Suprascapular nerve (C4, C5, C6)
Supraspinatus - Action(s)
Initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles
Infraspinatus - Origin
Infraspinous fossa of scapula
Infraspinatus - Insertion
Middle facet of greater tubercle of hunerus
Infraspinatus - Innervation
Suprascapular nerve (C5, C6)
Infraspinatus - Action(s)
Laterally rotate shoulder joint
Help hold humeral head in glenoid cavity
Teres Minor - Origin
Middle part of lateral border of scapula
Teres Minor - Insertion
Inferior facet of greater tubercle of humerus
Teres Minor - Innervation
Axillary nerve (C5, C6)
Teres Minor - Action(s)
Laterally rotate shoulder joint
Help hold humeral head in glenoid cavity
Teres Major - Origin
Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula
Teres Major - Insertion
Medial lip of intertubercular sulcus of humerus
Teres Major - Innervation
Lower subscapular nerve (C5, C6)
Teres Major - Action(s)
Adducts medially rotates shoulder joint
Subscapularis - Origin
Subscapular fossa of scapula
Subscapularis - Insertion
Lesser tubercle oh humerus
Subscapularis - Innervation
Upper and lower subscapular nerves (C5, C6, C7)
Subscapularis - Action(s)
Medially rotates and adducts shoulder joint
Helps hold head of humeral head in glenoid cavity
