松果体是间脑上后部突出的圆锥形松果样小体,居于胼胝体后缘与上丘之间,长度不及10mm,重约120～200mg。由于位居脑部中央,位置显目,早就为古代解剖学家所注目。高等脊椎动物松果体实质细胞属分泌型,有丰富的内质网,无光感受器功能,不过松果体发生上是与感光型细胞同源。从豚鼠松果体研究表明,背侧有两组受交感神经影响的活性细胞,其中一组细胞在暗黑环 The pineal gland is a conical pine cone-like body protruding from the posterior portion of the brain and lies between the posterior border of the corpus callosum and the superior colliculus. The length is less than 10 mm and weighs about 120-200 mg. Due to its central location in the brain, prominent position, long ago for the attention of ancient anatomists. Higher vertebrate pineal parenchyma cells are secreted, rich in endoplasmic reticulum, photoreceptor function, but the occurrence of pineal gland cells with photographic homology. From guinea pig pineal body studies have shown that there are two groups of dorsally activated by the sympathetic afferent cells, a group of cells in the dark ring