pectoralis major and minor
pectoralis minor/origin
anterior surface of ribs 3,4,5 near the coastal cartilage
pectoralis minor insertion
coracoid process of scapula
subclavius action
depression of shoulder elevate the 1st rib Stabilizes clavicle during shoulder movements ****prevents extreme elevation and protraction of the clavicle
trigger points for pectoralis major and minor
mimics heart attack pain (anterior shoulder pain, breast pain ,and diffuse soreness) "cardiac arrhythmia "on the right side lateral to xiphoid process between fifth and six ribs
pectoralis major
nicknamed "poor posture "and *****the" heart attack muscle "most superficial muscle of the chest
pec major origin
clavicular head medial 1/2 of clavicle Sternal head sternum and first six costal cartilage surfaces
subclavius insertion
Inferior surface of middle third of clavicle
pec major on test
crosses 3 joints acrominal/ clavicular sternal /clavicular glenohumeral joint
pec major Insertion
lateral lip of the bicipital groove
pec major action
protraction of scapula adduction horizontal abduction flexion and medial rotation of the humerus
pectoralis minor action
protraction, depression, downward rotation of scapula raises ribs in forced inspiration
pec minor
can entrap the neurovascular structure in the upper chest wall facilitating numbness ,tingling ,and pain in the upper extremities
thoracic outlet syndrome** on test
condition in which the scalene muscles draw the upper rib Superior the pectoralis minor pulls the clavicle inferior narrowing the space between clavicle and ribs
Subclavius Origin
costal cartilage of rib 1
pectoralis minor
stabilizes the clavicle deep to the pectoralis major when you show your shoulders you stretch this muscle