Upper extremity- Serratus anterior- Pectoralis minor

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Deltoid origin

1. anterior portion: lateral portion of the clavicle 2. middle portion: acromion process 3. posterior portion: scapular spine

subclavius innervation

nerve to subclavius

pectoralis minor action

1. depresses the scapula 2. downwardly rotates the scapula

pectoralis major origin

1. medial portion of clavicle 2. sternum and upper 6 costal cartilage

Deltoid action

1. anterior portion: flexes and internally (medially) rotates the arm 2. middle portion: abducts the arm (all) 3. posterior portion: extends and externally (laterally) rotates the arm

teres minor action

1. externally rotates the arm 2. functionally helps produce inferior translation and compression into glenoid during arm elevation (along with the other rotator cuff muscles)

Teres minor insertion

1. lowest of three facets of the greater tubercle of the humerus 2. capsule of the shoulder joint

Infraspinatus insertion

1. middle facet of the greater tubercle of the humerus 2. capsule of the shoulder joint

Serratus anterior action

1. protracts the scapula 2. assists to upwardly rotate the scapula 3. Functionally prevents winging

Supraspinatus insertion

1. uppermost of three facets of the greater tubercle of the humerus 2. capsule of the shoulder joint

Teres minor origin

middle half of the scapula's lateral border

pectoralis major innervation

1. Clavicular portion: lateral pectoral nerve 2. Sternal portion: lateral and medial pectoral nerves

subscapularis insertion

1. Lesser tubercle of the humerus 2. Capsule of the shoulder joint

Supraspinatus action

1. abducts the arm (almost solely for first 20 degrees) 2. functionally helps guide humeral head into central glenoid with elevation of shoulder

pectoralis major action

1. adducts teh arm 2. internally rotates the arm 3. horizontal adduction of arm 4. flexes the shoulder (from extended position)

subclavius insertion

inferior surface of clavicle

pectoralis minor origin

outer and anterior surface of ribs 3-5 near cartilage

subscapularis origin

subscapular fossa

Supraspinatus innervation

suprascapular nerve

infraspinatus innervation

suprascapular nerve

Supraspinatus origin

supraspinous fossa

subscapularis innervation

upper and lower subscapular nerves

infraspinatus action

1. externally rotates the arm 2. functionally helps produce inferior translation and compression into glenoid during arm elevation (along with the other rotator cuff muscles

teres major action

1. internally rotates the arm 2. extends the arm (from a flexed position) 3. adducts the arm

Serratus anterior origin

Anterolateral surface of the upper 8 or 9 ribs

Serratus anterior insertion

Costal aspect of the medial border of the scapula

Deltoid innervation

axillary nerve

teres minor innervation

axillary nerve

pectoralis minor insertion

coracoid process

Deltoid insertion

deltoid tuberosity

subclavius action

depresses and stabilizes clavicle

subclavius origin

first rib

Infraspinatus origin

infraspinous fossa

subscapularis action

internally rotates the arm

pectoralis major insertion

lateral lip of the biciptital groove

Serratus anterior innervation

long thoracic nerve

teres major origin

lower 1/3 of lateral border of scapula

teres major innervation

lower subscapular nerve

teres major insertion

medial lip of bicipital groove of humerus

pectoralis minor innervation

medial pectoral nerve


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