Scapular and Pectoral Muscles Flashcards
Deltoid origin
Lateral one third of the clavicle, acromion, and spine of scapula
Deltoid insertion
Deltoid tuberosity
Deltoid actions
Abducts arm, anterior fibers flex and medially rotate arm, posterior fibers extend and laterally rotate arm
Deltoid innervation
Axillary nerve
Deltoid blood supply
Posterior circumflex humeral artery
Supraspinatus origin
Surpaspinous fossa
Supraspinatus insertion
Greater tubercle of the humerus
Supraspinatus actions
Abducts arm
Supraspinatous innervation
Suprascapular nerve
Supraspinatous blood supply
Suprascapular artery
Infraspinatous origin
Infraspinous fossa
Infraspinatous insertion
Greater tubercle of the humerus
Infraspinatous actions
Laterally rotates arm
Infraspinatous innervation
Suprascapular nerve
Infraspinatous blood supply
Suprascapular artery
Teres minor origin
Axillary border of the scapula
Teres minor insertion
Greater tubercle of the humerus
Teres minor actions
Laterally rotates arm
Teres minor innervation
Axillary nerve
Teres minor blood supply
Circumflex scapular artery
Teres major origin
Axillary border of the scapula
Teres major insertion
Lesser tubercle of the humerus
Teres major actions
Extends, adducts, and medially rotates arm
Teres major innervation
Lower subscapular nerve
Teres major blood supply
Circumflex scapular artery and thoracodorsal artery
Subscapularis origin
Subscapular fossa
Subscapularis insertion
Lesser tubercle of the humerus
Subscapularis actions
Medially rotates the arm
Subscapularis innervation
Upper and lower subscapular nerve
Subscapularis blood supply
Subscapular artery
Pectoralis major origin
Sternum, costal cartilages 2-6, clavicle
Pectoralis major insertion
Lateral lip of intertubercular groove
Pectoralis major actions
Adducts, medially rotates, flexes arm; extends flexed arm; depresses and protracts pectoral girdle
Pectoralis major innervation
Medial and lateral pectoral nerve
Pectoralis major blood supply
Thoracoacromial and lateral thoracic artery
Pectoralis minor origin
Ribs 2-5
Pectoralis minor insertion
Coracoid process of scapula
Pectoralis minor actions
Depressed and protracts pectoral girdle
Pectoralis minor innervation
Medial pectoral nerve
Pectoralis minor blood supply
Thoracoacromial and lateral thoracic artery
Subclavius origin
1st costal cartilage
Subclavius insertion
Inferior surface of clavicle
Subclavius actions
Depresses clavicle; resists lateral dislocation
Subclavius innervation
Nerve to subclavius
Subclavius blood supply
Thoracoacromial artery
Serratus anterior origin
Ribs 1-9
Serratus anterior insertion
Ventral surface of medial border of scapula
Serratus anterior actions
Protracts and superiorly rotates scapula
Serratus anterior innervation
Long thoracic nerve
Serratus anterior blood supply
Lateral thoracic and sub scapular artery