Chest Flashcards
O: Pectoralis major
clavicle and costal cartilages of upper ribs
I: Pectoralis major
proximal end of the humerus
F: Pectoralis major (3)
1) medial rotation of arm
2) adduction of arm (from abducted position)
3) inhalation by expanding chest (accessory respiratory muscle)
N: Pectoralis major
brachial plexus
O: Pectoralis minor
ribs 3-5
I: Pectoralis minor
coracoid process of scapula
F: Pectoralis minor
anteroinferior tip of shoulder
N: Pectoralis minor
brachial plexus
Where is the serratus anterior?
between scapula and ribs
O: Serratus anterior
ribs 1-9
I: Serratus anterior
medial border of scapula
F: Serratus anterior
prime mover of protraction of scapula, stabilizes scapula to chest wall so that the scapula can be the attachment site for other muscles)
N: Serratus anterior
brachial plexus (long thoracic nerve)
What are the three layers of the intercostal muscles? (3)
1) external intercostal
2) internal intercostal
3) innermost intercostal
O: External intercostal
inferior border of rib above
I: External intercostal
superior border of rib below
F: External intercostal
elevation of rib below
N: External intercostal
intercostal nerves
O: Internal intercostal
superior border of rib below
I: Internal intercostal
inferior border of rib above
F: Internal intercostal
depression of rib above
N: Internal intercostal
intercostal nerves
O: Diaphragm (3)
1) xiphoid process
2) lower ribs
3) lumbar vertebrae
I: Diaphragm
dense connective tissue called central tendon towards the middle of the diaphragm
F: Diaphragm
1) breathing
2) going to washroom
3) reflexes such as coughing
N: Diaphragm
phrenic nerve from cervical plexus
What are the openings in the diaphragm for?
1) inferior vena cava
2) esophagus
2) aorta
Which bones does the diaphragm insert into?
Does not connect to any bones
What happens when the diaphragm contracts?
increases volume and decreases chest pressure but decreases abdominal cavity pressure
Prime mover for protraction of scapula
Serratus anterior
