Labs I and II Flashcards
pectoralis major origin, insertion, action
origin: medial half of clavicle, sternum, ribs 1-6
insertion: intertubercular groove of the humerus, anterior, lateral aspect
action: AD, flexion, medial rotation of the arm, at glenohumeral joint
blood supply and innervation of pectoralis major
blood supply: pectoral branch of the thoracoacromial artery (2nd part of axillary a)
innervation: medial and lateral pectoral nerves
Deltoid origin, insertion, action
origin: lateral 1/2 of clavicle, acromion, scapular spine
insertion: deltoid tuberosity of humerus
Action: all except ab/ad 0-15 degrees
looks like a triangle
deltoid innervation and blood supply
innervation: axillary
blood supply: deltoid branch of the thoracoacromial artery
coracobrachialis (O,I,A)
O: coracoid process
I: medial side of humerus shaft
A: flexion, AD of arm
Coracobrachialis (N &B)
N: musculocutaneous, pieces thradial rough
B: brachial artery
Subscapularis (OIA)
O: subscapular fossa crosses glenohumeral joint
I: lesser tubercle of humerus
A: medial rotation, AD, secure humerus head in socket
*rotator cuff muscle
Subscapularis (NB)
N: upper and lower subscapular
B: subscapular, suprascapular, and circumflex scapular arteries
Pectoralis Minor (OIA)
O: ribs 3-5
I: coracoid process of the scapula
A: medial rotation, protraction, scapular stabilization on scapular
anterior, landmark for 2nd part of axillary artery, deeper than pec major
Pectoralis Minor (NB)
N: medial pectoral *Medial does More
B: pectoral branch of the thoracoacromial artery
Serratus Anterior (OIA)
O: lateral surface of ribs 1-8
I: anterior medial border of scapula
A: stabilizes scapula, protraction, lat rotation for AB beyond 90 degrees
*looks a little saw-like
Serratus Anterior (NB)
N: long thoracic (C5,C6,C7 raise your arms to heaven)
B: lateral thoracic artery, the superior thoracic artery, and the thoracodorsal artery
- damage to nerves would result in scapular winging
Teres Major (OIA)
O: inferior angle of scapula (bottom of scapula)
I: interubercular groove of humerus (medial lip)
A: medial rotation, AD of arm
Teres Major (NB)
N: lower subscapular
B: scapular and circumflex arteries (3rd part axillary a)
*posterior, round or smooth shoulder muscle
Teres Minor (OIA)
O: lateral border of scapula
I: greater tubercle of humerus
A: lateral rotation of arm, AD, secure head of humerus
*more superior than major, under infraspinatus
Teres Major (NB)
N: axillary nerve
B: Subscapular and circumflex scapular arteries
Supraspinatus (OIA)
O: supraspinous fossa
I: greater tubercle of humerus
A: AB 0-90 degrees, ESSENTIAL for 0-15, secure humerus head
Supraspinatus (NB)
N: suprascapular nerve
B: Suprascapular artery
Infraspinatus (OIA)
O: infraspinous fossa
I: greater tubercle of humerus
A: lateral rotation of arm and AD of arm
Infraspinatus (NB)
N: suprascapular nerve
B: suprascapular and circumflex scapular arteries