Which of the following is Ture for the rest posture of the hand? A: dorsal extension 10°-15° B: dorsal extension 20°-25° C: ventral flexion 10°-15° D: ventral flexion 20°-25° E: none of the above

Which of the following is Ture for the function posture of the hand? A: dorsal extension 10°-15° B: dorsal extension 20°-25° C: ventral flexion 10°-15° D: ventral flexion 20°-25° E: none of the above

In the center of the spinal cord is a butterfly-shaped area of . A: white matter B: dorsal root C: gray matter D: ventral root

plays an important role in the formation of long-term memory, particularly of places, and is thus required for learning. A: white matter B: hippocampus 海马体 C: amygdala 杏仁核 D: ventral root