Archive image from page 628 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Entering posterior nerve- root Fig. 528.—Diagram of the Spinal Origin of the Accessory Nerve (after Bruce). Emerging filum of accessory nerve Fibres of spinal origin of accessory Emerging anterior nerve- root Fig. 529.—Section through the Superior Part of the Cervical Eegion of the Spinal Medulla (Orang). Showing the origin of the spinal part of the accessory nerve. immediately behind the nerve-cells which give rise to the fibres of the ant
Archive image from page 628 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Entering posterior nerve- root Fig. 528.—Diagram of the Spinal Origin of the Accessory Nerve (after Bruce). Emerging filum of accessory nerve Fibres of spinal origin of accessory Emerging anterior nerve- root Fig. 529.—Section through the Superior Part of the Cervical Eegion of the Spinal Medulla (Orang). Showing the origin of the spinal part of the accessory nerve. immediately behind the nerve-cells which give rise to the fibres of the anterior roots of the upper five cervical nerves. The cells of the accessory nucleus are large, multipolar, and in every respect similar to the motor cells of the spinal nerves. The axons from these cells leave the dorsal aspect of the nucleus in converging groups to form the fila radicularia or root-bundles of the nerve. These, in the first place, proceed straight backwards in the anterior column of gray matter. Eeaching the bay between the two columns of gray matter, they turn sharply laterally into the white matter and traverse the lateral funiculus to gain their points of exit from the spinal medulla. At the decussation of the pyramids, fila, which join the accessory nerve, are seen to proceed from the detached head of the anterior column of gray matter. The cerebral part of the accessory nerve has its nucleus of origin in the medulla oblongata; and its fila, as they proceed laterally from this, can be distinguished by the fact that they pursue a course on the ventral side of the tractus spinalis of the trigeminal nerve, whereas the vagus roots, with which they are apt to be confused, pass through or lie on the dorsal aspect of the trigeminal root (Kolliker). The nucleus of origin of the cerebral part of the accessory nerve is formed by the same column of cells which constitutes the nucleus ambiguus, and which, at a higher level, gives motor fibres to the vagus and glossop
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