Shoulder/Breast/Pectoral Flashcards
Pectoralis major
Origin: Sternal half of clavicle, sternum to 7th rib, cartilages of true ribs, aponeurosis of external oblique muscle
Insertion: Lateral lip of intertubercular sulcus of humerus
Innervation: medial and lateral pectoral nerves
Main actions: Flexes and adducts arm, rotates arm medially
Blood supply: Pectoral branch of thoraco-acromial artery, perforating branches of internal thoracic artery
Pectoralis minor
Origin: outer surface of upper margin of ribs 3-5
Insertion: coracoid process of scapula
Innervation: medial pectoral nerve
Main actions: Lowers lateral angle of scapula and protracts scapula
Blood supply: Pectoral branch of thoraco-acromial and intercostal lateral thoracic arteries
Deltoid
Origin: Lateral third of anterior clavicle, lateral acromion, inferior edge of spine of scapula
Insertion: Deltoid tuberosity of humerus
Innervation: axillary nerve
Main actions: Clavicular part: flexes and medially rotates arm. Acromial part: abducts arm beyond initial 15 degrees done by supraspinatus. Spinal part: extends and laterally rotates arm
Blood supply: Posterior circumflex humeral artery, deltoid branch of thoraco-acromial artery
Infraspinatus
Origin: infraspinous fossa of scapula and deep fascia
Insertion: middle facet of greater tubercle of humerus
Innervation: suprascapular nerve
Main actions: lateral rotation of arm (with teres minor)
Blood supply: suprascapular artery
subscapularis
Origin: subscapular fossa
Insertion: lesser tubercle of humerus
Innervation: upper and lower subscapular nerves
Main actions: medially rotates arm at shoulder and adducts it, helps hold humeral head in glenoid cavity
Blood supply: subscapular artery, lateral thoracic artery
suprasinatus
Origin: supraspinous fossa of scapula and deep fascia
Insertion: superior facet of greater tubercle of humerus
Innervation: suprascapular nerve
Main actions: initiates arm abduction, acts with rotator cuff muscles
Blood supply: suprascapular artery
Teres major
Origin: posterior surface of inferior angle of scapula
Insertion: medial lip of intertubercular sulcus of humerus
Innervation: lower subscapular nerve
Main actions: adducts and medially rotates arm
Blood supply: circumflex scapular artery
Teres minor
Origin: upper 2/3 of posterior surface of lateral border of scapula
Insertion: inferior facet of greater tubercle of humerus
Innervation: axillary nerve
Main actions: lateral rotation of arm
Blood supply: suprascapular artery
Subclavian Artery Branches
VITamin C and sometimes D
V= Vertebral artery I = Internal Thoracic Artery T= Thyrocervical Trunk
C= Costocervical
D= Dorsal scapular artery
Axillary Artery Branches
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S= Superior Thoracic T= Thoraco-acromial (pectoral, deltoid, acromial, clavicular) L= Lateral Thoracic Artery S= subscapular artery (circumflex scapular & thoracodorsal) A= Anterior circumflex humeral P= Posterior circumflex humeral
Suprascapular Notch
Suprascapular a & n (army over navy (superior transverse scapular ligament)
Quadrangular Space
Teres minor (S), teres major (I), long head of triceps (M) & humerus (L); axillary n. & Posterior circumflex humeral a.
Triangular Space
Teres minor (S), teres major (I) & long head of triceps (L); Circumflex scapular a.
Triangular Interval
Teres major (S), long head of triceps (M) & lateral head of triceps (L); Profunda brachii a. & Radial n.
Mammary glands
modified and specialized type of sweat gland
