Scapular and Pectoral Region Flashcards by Megi Hysi

Prime mover of scapular elevation

Trapezius

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Prime mover of scapular depression

Gravity

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Prime mover of scapular inferior rotation

Latissimus Dorsi

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Prime mover of scapular superior rotation

Trapezius and serratus anterior

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Prime mover of scapular protraction

Serratus anterior

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Prime mover of scapular retraction

Trapezius

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Origin of trapezius

Occipital one, spinous process of C7-T12

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Insertion of trapezius

Lateral 1/3 of clavicle, scapular spine, acromion process

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Action of trapezius

Depends on fibers activated
Elevation (descending), depression (ascending), retraction (middle), superior rotation (ascending and descending)

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Innervation for trapezius

Accessory nerve (CN XI)

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Origin of latissimus dorsi

Spinous process T7-12

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Insertion of latissimus dorsi

Intertubercular sulcus of humerus

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Action of latissimus dorsi

Adduction, extension, and medial rotation of humerus (toilet paper muscle)

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Innervation of latissimus dorsi

Thoracodorsal nerve

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Origin of levator scapulae

Transverse processes of C1-4

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Insertion of levator scapulae

Superior angle of scapula

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Action of levator scapulae

Elevation and inferior rotation

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Innervation of levator scapulae

Dorsal scapular nerve

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Origin of rhomboid minor

Spinous processes of C7-T1

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Insertion of rhomboid minor

Medial border of scapula at scapular spine

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Action of rhomboid minor

Elevates and retracts scapula

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Innervation of rhomboid minor

Dorsal scapular nerve

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Origin of rhomboid major

Spinous processes of T2-5

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Insertion of rhomboid major

Medial border of scapula inferior to scapular spine

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Action of rhomboid major

Elevation and retractions

Innervation of rhomboid major

Dorsal scapular nerve

Origin of pectoralis major (clavicular head)

Medial 1/3 of clavicle

Insertion of pectoralis major

Lateral lip of intertubercular sulcus

Origin of pectoralis major (sternocostal head)

Sternum and costal cartilages 1-6

Origin of pectoralis major (abdominal head)

Aponeurosis of external oblique

Innervation of pectoralis major

Medial and lateral pectoral nerve

Action of clavicular head of pectoralis major

Arm flexion

Action of sternocostal head of pectoralis major

Extend arm from flexed position

Action of the entire pectoralis major muscle

Adduct and medially rotate arm

Origin of pectoralis minor

Ribs 3-5

Insertion of pectoralis minor

Coracoid process

Action of pectoralis minor

Protract scapular and elevate ribs

Innervation of pectoralis minor muscle

Medial pectoral nerve

Origin of subclavius

Rib 1

Insertion of subclavius

Inferior clavicle

Action of subclavius

Depress clavicle

Innervation of subclavius

Subclavius nerve

Origin of serratus anterior

Ribs 1-9

Insertion of serratus anterior

Anterior surface of medial border of scapula

Actions of serratus anterior

Protraction and superior rotation of scapula

Innervation of serratus anterior

Long thoracic nerve

Origin of posterior/spinal head of deltoid

Scapular spine

Origin of middle/acromial head of deltoid

Acromion process

Origin of anterior/clavicular head of deltoid

Lateral third of clavicle

Insertion of deltoid

Deltoid tuberosity

Action of anterior head of deltoid

Flex and medially rotate humerus

Action of middle head of deltoid

Abduct humerus

Action of posterior head of deltoid

Extend and laterally rotate humerus

Innervation of deltoid

Axillary nerve

Origin of teres major

Inferior angle of scapula

Insertion of teres major

Medial lip of intertubercular sulcus

Action of teres major

Adduct and medially rotate humerus

Innervation of teres major

Lower subscapular nerve

Muscles of the rotator cuff

Supraspinatus, infraspinatus, teres minor, subscapularis

Origin of supraspinatus

Supraspinous fossa

Insertion of supraspinatus

Greater tubercle

Action of supraspinatus

Initiates abduction

Innervation of supraspinatus

Suprascapular nerve

Origin of infraspinatus

Infraspinous fossa

Insertion of infraspinatus

Greater tubercle

Action of infraspinatus

Lateral rotation

Innervation of infraspinatus

Suprascapular nerve

Origin of teres minor

Lateral border of scapula

Insertion of teres minor

Greater tubercle

Innervation of teres minor

Axillary nerve

Origin of subscapularis

Subscapular fossa

Insertion of subscapularis

Lesser tubercle

Action of subscapularis

Medial rotation

Innervation of subscapularis

Upper and lower subscapular nerve

Blood supply to pectoral muscles

Pectoral branches of the thoracoacromial trunk

Blood supply to anterior deltoid

Deltoid branches of the thoracoacromial trunk

Blood supply to serratus anterior

Lateral thoracic artery from the axillary artery

Blood supply to supra and infraspinatus

Suprascapular and circumflex scapular artery

Blood supply to teres major

Circumflex scapular and thoracodorsal

Blood supply to posterior deltoid

Posterior circumflex humeral