About the pectoralis major, which of the statement is wrong?___
A. It arises from the medial half of clavicle, sternum and upper six costal cartilages.
B. It is inserted into the crest of greater tubercle of humerus.
C. It can adduct, flex and medial rotate the arm.
D. When the arms are fixed, it draws the body downward.
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About the intercostal muscles, which of the statements is right? ___
A. Intercostales externi elevate the ribs and help to inspirate.
B. Intercostales externi elevate the ribs and help to expirate.
C. Intercostales interni elevate the ribs and help to inspirate.
D. Intercostales interni elevate the ribs and help to expirate.
Which of the following can drop the ribs? ___
A. Serratus anterior
B. Intercostales externi
C. Diaphragm
D. Intercostales interni
About the diaphragm, which of the statements is wrong? ___
A. It lies between the thoracic and abdominal cavities.
B. It consists of muscular fibers and central tendon.
C. The muscular fibers are divided into sternal and costal parts.
D. It is the principal muscle of inspiration.
The aortic aperture lies at the level of ___
A. 6th thoracic vertebra
B. 8th thoracic vertebra
C. 10th thoracic vertebra
D. 12th thoracic vertebra
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