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
Arterial Supply to Breast
Internal thoracic a. (aka. Internal mammary) (Subclavian)
Pectoral branch of thoracoacromial trunk (axillary)
Lateral thoracic a. (axillary)
Lymphatics of the Breast
CLASP
C= central L= Lateral A= Apical S= Subscapular P= Pectoral
Highest Frequency of Breast Cancer Occurs Where?
Superior-lateral quadrant of the breast, which drains to the axillary nodes
