24: UE Myology: Trunk Flashcards
Pec major O and I
O: medial clavicle, anterior sternum, costal cartilages 1-6
I: intertubercular groove of humerus
Pect major A
Adduct, medially rotates, flexes and extends humerus, protracts and depresses scapula
Pec major and minor N
Pec major: lateral and medial pectoral N
Pec minor: medial pectoral N
Which muscle is pierced by the medial pectoral N
Pec minor
Pec minor O and I
O: medial aspect ribs 3-5
I: coracoid process of scapula
Pec minor A
Stabilizes scapula by protracting + depressing against thoracic wall
Subclavius O and I
O: upper border 1st rib, 1st costal cartilage
I: inferior clavicle
Subclavius A
Positions and depresses clavicle
Subclavius N
N to subclavius
Serratus anterior O and I
O: lateral external ribs 1-8
I: medial border of scapula
Serratus anterior A
Protracts scapula, stabilizes against thoracic wall, rotates glenoid cavity superiorly
Serratus anterior N and blood supply
N: long thoracic N
BS: lateral thoracic A
What does injury to long thoracic nerve cause?
Winging of the scapula away from thoracic wall -> abduction of upper limb becomes difficult
Deltoid O and I
O: lateral clavicle, scapular spine, acromion
I: deltoid tuberosity of humerus
Deltoid A: three parts
Anterior portion: flex, medially rotate
Middle: abduct humerus
Posterior: extend, laterally rotate humerus
Deltoid N
Axillary N
Subscapularis O and I
O: medial aspect of subscapular fossa
I: lesser tubercle of humerus
Subscapularis A
Medially rotate and adduct humerus
Subscapularis N
Upper subscapular N, lower subscapular N
Four rotator cuff muscles and their action
Subscapularis, supraspinatus, infraspinatus, teres minor: hold humeral head in glenoid cavity
Supraspinatus O and I
O: supraspinatus fossa of scapula
I: greater tubercle of humerus
Supraspinatus A
Abducts humerus
Supraspinatus and infraspinatus N
Suprascapular N
Infraspinatus O and I
O: infraspinous fossa
I: greater tubercle of humerus
Infraspinatus A
Laterally rotate humerus
Teres minor O and I
O: middle lateral border of scapula
I: greater tubercle of humerus
Teres minor A
Laterally rotate humerus
Teres minor N
Axillary N
Most commonly injured rotator cuff muscle
Supraspinatus
Teres major O and I
O: posterior aspect of inferior angle of scapula
I: medial edge of intertubercular groove of humerus
Teres major A
Adduct, medially rotate humerus
Teres major N
Lower subscapular N
