Which of the following describes the arthrokinematic motion that occurs at the humeroulnar joint when the elbow is flexing to bring your hand to your mouth?
a. Caudal/anterior/cephalic glide of ulna on trochlea; medial glide of ulna on trochlea
b. Cephalic/posterior/caudal glide of ulna on trochlea; medial glide of ulna on trochlea
c. Caudal/anterior/cephalic glide of ulna on trochlea; lateral glide of ulna on trochlea
d. Cephalic/posterior/caudal glide of ulna on trochlea; lateral glide of ulna on trochlea
ANS: C
The concave trochlear ridge of the ulna glides along the trochlear groove of the humerus until the coronoid process reaches the coronoid fossa. As the semicircular-shaped trochlear notch moves in a generally anterior direction, the motion is also noted to be cephalic at the bottom of the notch and caudal at the top of the notch. Because the trochlea is more inferior than the trochlear groove, there is also a lateral glide of the ulna on the trochlea.
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