A．right atriumB．superior vena cavaC．inferior vena cavaD……

单项选择题The fossa ovalis is （）.

A．a foramen between the right atrium and the left one
B． existent during the fetus
C．located on the lower part of the right surface of the interatrial septum
D．the thickest part of the wall of the heart
E．a remnant of the fetal heart between the atrium and ventricle

单项选择题The narrowest part of the laryngeal cavity is （）.

A．the aperture of larynx
B．the rima vestibuli
C．the intermedial cavity of larynx
D．the fissure of glottis
E．the infraglottic cavity

单项选择题The maxillary sinuses open into （）.

A．the nasal vestibule
B．the sphenoethmoidal recess
C．the superior nasal meatus
D．the middle nasal meatus
E．the inferior nasal meatus

单项选择题Which nerve injured can lead to “claw hand”(爪形手) （）.

A．musculocutaneous nerve
B．median nerve
C．ulnar nerve
D．axillary nerve
E．radial nerve

单项选择题The apex of axilla is bounded by （）.

A．lateral 1/3 of clavicle
B．medial border of scapula
C．lateral border of first rib
D．head of humerus
E． pectoralis major