File:A treatise on anatomy, physiology and hygiene - designed for colleges, academies and families (1850) (14598279227).jpg

Identifier: treatiseonanatom00cutt (find matches)
Title: A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families
Year: 1850 (1850s)
Authors: Cutter, Calvin, 1807-1873?
Subjects: Physiology Anatomy Hygiene Anatomy Physiology Hygiene
Publisher: Boston : B.B. Mussey
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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d pair of nerves. 8, The pons varolii. 9, Tbe fourth pair ofnerves. 10, Tbe lower portion of the medulla oblongata. 11, II, The spinal cord.12, 12, Spinal nerves. 13, 13, The brachial plexus. 14, 14, The lumbar and sacralplexus. 7oS. How many pairs of nerves issue from the spinal cord ? Explain fig.123 Fig. 129. 29* 342 ANATOMY, PHYSIOLOGY, AND HYGIENE. roots ; ail anterior, or motor root, and a posterior, or sensitiveroot. Each nerve, wlien minutely examined, is found to con-sist of an aggregate of very delicate filaments, enclosed in acommon-cellular envelope. 759. The anterior roots arise from a narrow white lineupon the anterior columns of the spinal cord. The posteriorroots arise from a narrow gray band formed by the internalgray subst;ince of the cord. They are larger, and the fila-ments of origin more numerous than those of the anteriorroots. A ganglion is found upon each of the posterior rootsin the openings between the bones of the spinal column throughwhich the nerve passes.
Text Appearing After Image:
Fig. 130. A section of the spiniil coril, surnniiKleil by its sheath. B, A spinalnerve, formed by tiie iiiiioii of the motor root (C) and the sensitive root (D.) At D.the ganglion upon this root is seen 760. After the ibrmation of the ganglion, the two rootsunite, and constitute a spinal nerve, which passes through theopening between the vo.-tebraj on the sides of the spinalcolumn. The nerves divide and subdivide, until their minutefilaments ramify on the tissues of the. ditferent organs. 7o9. Give the origin of the anterior roots. Of the posterior roots. Inwhat rc.si)r.ct do the posterior roots differ from the anterior? 760. WTtcndo the two roots unite, and where do ihoy pass ? ANATOMY OF THE NERVOUS SYSTEM. 343 761 The spinal nerves are divided into — Cervical, , . 8 pairs, Dorsal, 12 Lumbar, 5 Sacral, 6 762. ■ The four lower cervical and upper dorsal pass intoeach other, and then separate to reunite. This is called thebrachi-al plexus. From this plexus six nerves proceed,which

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