Marchetti C, Piacentini C
Institut d'Histologie et d'Embryologie Générale, l'Université de Pavie, Italie.
Bull Group Int Rech Sci Stomatol Odontol. 1990 Apr;33(1):19-23.
The existence and the morphological characteristics of the lymphatic capillaries of the dental pulp have been and are yet discussed. In this study the morphological properties of the lymphatic capillaries of the healthy human dental pulp have been described at light and electron microscopy. For the investigation human enclosed incisive and canine teeth surgically extracted and permanent premolars extracted for orthodontic reasons were used. On semithin sections the lymph capillaries are detectable as vessels of 15-50 microns in diameter with a very irregular shape and a subtle wall. No pericytes or muscular cells surround the endothelial lining. At ultrastructural level the lymph capillaries show a very thin and indented wall with protrusions towards the vessels lumen or the interstitium. The connections between adjacent endothelial cells are different and variously shaped: end to end contacts, overlapping between cellular protrusions and complex interdigitations among multiple protrusions of the endothelial cells. Sometimes the overlappings between endothelial cells determine intraparietal channels in communications with the interstitium and the vessel lumen. A discontinuous basal lamina and a network of filaments and fibrils surround the endothelial wall. Between the cytoplasmic organelles micropinocytotic vesicles, multivesicular bodies and the Weibel-Palade bodies are present.
牙髓淋巴管的存在及其形态特征一直是并仍在被讨论。在本研究中,已在光学显微镜和电子显微镜下描述了健康人牙髓淋巴管的形态学特性。为进行研究,使用了因正畸原因拔除的人离体切牙和尖牙以及恒前磨牙。在半薄切片上,淋巴毛细管可检测为直径15 - 50微米的血管,形状非常不规则,壁很薄。内皮衬里周围没有周细胞或肌细胞。在超微结构水平上,淋巴毛细管显示出非常薄且有凹陷的壁,向血管腔或间质突出。相邻内皮细胞之间的连接不同且形状各异:端对端接触、细胞突起之间的重叠以及内皮细胞多个突起之间的复杂交叉。有时内皮细胞之间的重叠会形成与间质和血管腔相通的壁内通道。不连续的基膜以及细丝和纤维网络围绕着内皮壁。在细胞质细胞器之间存在微吞饮小泡、多泡体和魏尔-帕拉德小体。