Ghazi S R, Gholami S
Department of Anatomical Sciences, School of Veterinary Medicine, Shiraz University, Iran.
Anat Histol Embryol. 1997 Sep;26(3):211-5. doi: 10.1111/j.1439-0264.1997.tb00128.x.
This study reports the angulation of spinal nerves, the length of dorsal roots, the length of spinal nerves and the transverse and vertical diameters of the spinal cord during pre- and postnatal life in sheep of the Mehraban breed in Iran. The spinal cord of these animals was divided into 4 regions with respect to the angulation of spinal nerves. The first region was from the first to fifth cervical and the second was from the sixth cervical to the eighth thoracic in fetuses and from the six cervical to fourth thoracic in adults. The third region was from the ninth thoracic to second lumbar in fetuses and from the fifth thoracic to second lumbar in adults, and the fourth region was from third lumbar to fourth sacral in the animals of all age groups. The length of dorsal roots from their point of emergence from the spinal cord to the dorsal root ganglia showed a direct correlation with the length of the spinal nerves. While angulation of the spinal nerves showed a converse correlation with the length of either spinal nerves or dorsal roots. The transverse diameters of the spinal cord were always longer than the vertical diameters. The greatest diameters (vertical-7.00 mm; transverse-10.00 mm) are recorded at C1, T1 and L6 in adult sheep.
本研究报告了伊朗梅拉班品种绵羊在出生前和出生后脊髓神经的角度、背根长度、脊髓神经长度以及脊髓的横径和纵径。根据脊髓神经的角度，这些动物的脊髓被分为4个区域。第一个区域从第一至第五颈椎，第二个区域在胎儿期从第六颈椎至第八胸椎，在成年期从第六颈椎至第四胸椎。第三个区域在胎儿期从第九胸椎至第二腰椎，在成年期从第五胸椎至第二腰椎，第四个区域在所有年龄组的动物中从第三腰椎至第四骶椎。背根从脊髓发出点到背根神经节的长度与脊髓神经的长度呈正相关。而脊髓神经的角度与脊髓神经或背根的长度呈负相关。脊髓的横径总是长于纵径。成年绵羊在C1、T1和L6处记录到最大直径（纵径-7.00毫米；横径-10.00毫米）。
