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Pectoral & Shoulder Regions
Muscle insertions, origins, insertions, innervations and blood supplies
49
Anatomy
Post-Graduate
06/18/2010

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Term
Pectoral Girdle
Definition
the bony ring formed by the scapula and clavicle
Term
Brachial plexus
Definition
a nerve network formed by ventral rami of spinal nerves c5, 6, 7, 8, and t1

runs through the axilla
Term
teres major origin
Definition
posterior side of scaupula near inf angle
Term
teres major insertion
Definition
medfial lip of intertubercular groove, near insert of lat dorsi
Term
teres major innervation
Definition
lower subscapular n
Term
teres major actions
Definition
extension,a dduction and medial rotation of humerus
Term
teres major blood supply
Definition
subscapular artery
Term
Deltoid origin
Definition
lateral thrid of clavicle, acromion, apine of scapula (same as trapezius)
Term
Deltoid insertion
Definition
deltoid tuberosity of humerus
Term
Deltoid innervation
Definition
axillary n (courses around post side of surg neck of humerus)
Term
Deltoid blood supply
Definition
posterior circumflex artery
Term
quadrangular space borders
Definition
"gang symbol"
teres minor, major, long head of triceps brachii, and surgical neck of humerus
Term
Deltoid actions
Definition
on humerus:
flexes
medially rotates
laterally abducts
extends laterally rotates
Term
synovial bursa
Definition
flat sac of synovial membrane enclosing a film of slippery synovial fluid
functions to lubricate motion
between greater tubercle of humerus and deltoid and acromion
Term
Subscapularis origin
Definition
subscapular fossa of the scapula
Term
Subscapularis insertion
Definition
lesser tubercle of the humerus
Term
Subscapularis innervation
Definition
upper and loer subscapular nn
Term
Subscapularis blood supply
Definition
subscapular a
Term
Subscapularis action
Definition
medially rotates the humerus
Term
Supraspinatus origin
Definition
Supraspinous fossa of the scapula
Term
Supraspinatus innervation
Definition
Suprascapular n (courses though the suprascapular notch and under the transverse scauplar ligament
Term
Supraspinatus blood supply
Definition
suprascapular a (courses over the transverse scapular ligament)
Term
Supraspinatus action
Definition
laterally roates the humerus
Term
teres minor origin
Definition
posterior side of scapula, near the lateral border, lateral to the origin of teres major
Term
teres minor insertion
Definition
post. side of greater tubercle of humerus
Term
teres minor innervation
Definition
acillary n
Term
teres minor blood supply
Definition
circumflex scapular branch of subscaular a
Term
teres minor action
Definition
laterally rotates the humerus
Term
pectoralis major origin
Definition
clavicular head: medial third of the clavicle
sternocostal head: sternum and costal cartilages
Term
pectoralis major insertion
Definition
lateral lip of the intertubercular groove
Term
pectoralis major innercation
Definition
lateral and medial pectoral nn
Term
pectoralis major blood supply
Definition
branches of the internal thoracic, lateral thoracic, and thoraco-acromial arteries
Term
pectoralis major actions
Both heads:
Clavicular head:
Sternocostal Head:
Definition
Both heads: adduct and medially rotate the humerus

Clavicular head: flexes humerus

Sternocostal Head: flexes the entended humerus, but extends the flexed humerus, also depresses and protracts the shoulder girdle by pulling the humerus
Term
Pectoralis Minor origin
Definition
ribs 3, 4, 5 near the constochondral junctions
Term
Pectoralis Minor insertion
Definition
corqcoid process of the scapula
Term
Pectoralis Minor innervation
Definition
medial pectoral n
Term
Pectoralis Minor blood supply
Definition
branches of axillary arter:

lateral thoracic and thoracocacromial aa
Term
Pectoralis Minor actions
Definition
depresses and protracts the shoulder girdle

helps with inferior rotaion of scapula
Term
Subclavius origin
Definition
first costal cartilage
Term
Subclavius insertion
Definition
inferior side of clavicle
Term
Subclavius innercation
Definition
nerve to subclavius (branch of brachial plexus)
Term
Subclavius action
Definition
depresses clavicle and resists lateral dislocation of clavicle
Term
Serratus anterior origin
Definition
first 8 ribs, laterally
Term
Serratus anterior insertion
Definition
anterior (deep) side of scapula alonf its ENTIRE medial border
Term
Serratus anterior blood supply
Definition
subscapular and lateral thoracic aa
Term
Serratus anterior innervation
Definition
long thoracic n
Term
Serratus anterior actions
Definition
protracts shoulder girdle (pulls scaula anteriorly)

holds the scapula to rib cage

rotates scpula superiorly during abduction of arm by pulling its inferior angle forward
Term
what does denervation of the serratus anterior m result in?
Definition
winging of the scapula
Term
Arteries anastomosing on the dorsum of the scapula
Definition
suprascapular a
dorsal scapular a
subscapular a
circumflex a
posterior circumflex humeral a
subscapular a
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