Session 1 Flashcards
How does contraction of pectoralis major assist in breathing?
The two pectoralis muscles form part of a ring of muscles which encircle the thoracic
cage; the other muscles forming the ring are the scapula muscles. When the ring contracts the thoracic pressure rises to assist exhalation. This only occurs in disease and during exercise; normal exhalation is a passive process.
Which bony structures lie subcutaneously in the anterior chest wall?
The clavicles and sternum (made up of the manubrium, body and xiphi-sternum). The ribs are deep to muscles so are not subcutaneous.
What are the articulations of the clavicle?
At the medial end to the manubrium of the sternum; the sternoclavicular joint and at the lateral end to the acromion of the scapula; the acromioclavicular joint.
What forms the anterior axillary fold?
The lower edge of the pectoralis major muscle.
What lies deep to pectoralis minor muscle?
The axilla.
The majority of breast tissue is in the upper outer quadrant of the breast. Where does
lymph from this part of the breast drain?
To the axillary lymph nodes.
Which costal cartilage connects to the sternum at the sternal angle (angle of Louis)?
The second costal cartilage.
