Thoracic musculature Flashcards
Pectoralis major prox/distal attachments
Prox: medial 1/2 of clavicle, sternum, and the costal cartilage of costal heads of ribs 6-7
Distal: lateral lip of intertubercular crest and the bicipital groove of the humerus
Pectoralis major innervation and blood supply
Innervation: lateral pectoral nerve (C5-T1) and the medial pectoral nerve (C8,T1)
BS: pectoral branch of thoracoacromial trunk
Pectoralis major actions
Flx vs. Ext, Internal rotation/adduction of glenohumeral joint
Pectoralis minor prox/distal attachments
Prox: ribs 3-5
Distal: coracoid process of the scapula
Pectoralis minor innervation and blood supply
Innervation: medial pectoral nerve (C8,T1)
BS: pectoral branch of thoracoacromial trunk
Pectoralis minor actions
Depression and anterior tilt of scapula
Serratus anterior prox/distal attachments
Prox: Ribs 1-9
Distal: anterior medial border of the scapula
Serratus anterior innervation and blood supply
Innervation: long thoracic nerve (C5-C7) SALT57
Blood supply: lateral thoracic and thoracodorsal arteries
Serratus anterior actions
elevation of ribs, scapular protraction and upward rotation
Subclavius prox/distal attachments
Prox: costal cartilage of rib 1
Distal: surface under the distal clavicle
Subclavius innervation and blood supply
Innervation: nerve to subclavius (C5-C6)
Blood supply: pectoral branch of thoracoacromial trunk
Subclavius action
Depression of the clavicle
Diaphragm prox/distal attachments
Prox: costal margin, inferior border of ribs 11/12, L3 (right crus) and L2 (left crus)
Distal: central tendon
Diaphragm innervation and blood supply
Innervation: phrenic nerve (C3-C5)
Blood supply: musculophrenic and inferior phrenic arteries
Diaphragm actions
normal breathing; 70-80% breathing at rest
