. Anatomy of the cat. Cats; Mammals. THll CliNTRAL NERl^OUS SYSTEM. 337 Goll. The lateral and thicker is the fasciculus cuneatus (^) or column of Burdach. T/w membranes of the spinal cord : The dura mater is a tough fibrous membrane directly con- tinuous with the dura mater of the brain. It differs from the dura mater of the brain in two particulars: 1. At the foramen magnum it splits into two layers, one of which lines the bony vertebral canal and forms its periosteum, while the other covers the cord. 2. It is separated from the cord by a con- siderable space. The dura mater is contin- uous w
. Anatomy of the cat. Cats; Mammals. THll CliNTRAL NERl^OUS SYSTEM. 337 Goll. The lateral and thicker is the fasciculus cuneatus (^) or column of Burdach. T/w membranes of the spinal cord : The dura mater is a tough fibrous membrane directly con- tinuous with the dura mater of the brain. It differs from the dura mater of the brain in two particulars: 1. At the foramen magnum it splits into two layers, one of which lines the bony vertebral canal and forms its periosteum, while the other covers the cord. 2. It is separated from the cord by a con- siderable space. The dura mater is contin- uous with the fibrous sheaths of the spinal nerves at their points of exit. Along the 5' po^te'-ior median ^ ^ sulcus; l>, posterior sides of the cord it is connected to the pia lateral sulcus; r, an- matcr by a delicate strand of connective tissue '"'"'' '""'""" '""^'"•'"^. Fig. 134. SI5CTION - Cross- OF THE. Si'iNAL Cord in THE Cervical Re- gion. (/. fasciculus gracilis; i\ fasciculus cuneatus; y, while matter; g, gray matter; //, cen- tral canal. probably equivalent to the " ligamentum denticulatum '' of man. The arachnoid is a delicate cellular mem- brane lying beneath the dura mater, between it and the pia mater. It forms a continuous investment for the cord, is not vascular, and is said not to dip into the fissures of the cord. The pia mater invests the cord closely and contains some blood-vessels. It is a delicate membrane which dips into the fissures and sulci of the cord and is con- nected to it by numerous strands of con- nective tissue that pass from it into the Fig. 155. —Section of substance of the cord. The nerves pierce SriNALCoRo. showing; THE Origin of a Pair OF Spinal Nerves. It. Spinal Nerves.—From the spinal cord a, dorsal root; /'. spinal arise the spiual nerves. Of these there ganglion; c, dorsal rannis; , . d, ventral ramus; e, ven- are about thirty-eight pairs in the cat. ^''^^ '?°°'- Eight
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