File:Kirkes' handbook of physiology (1907) (14766649401).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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evessels and give to the organ its condition of tension and firmness. Thesame general condition of vessels exists in the corpus spongiosum urethra?, VASCULAR NERVES FOR THE TRUNK AND LIMBS 225 but the fibrous tissue around the urethra is much weaker than around thebody of the penis, while around the glans there is none. The venous bloodis returned from the plexuses by comparatively small veins; all of whichare liable to the pressure of muscles when they leave the penis. The mus-cles chiefly concerned in this action are the erector penis and acceleratorurinae. Erection results from the distention of the venous plexuses by asudden influx of blood resulting from the action of the nervous vascular re-flexes. It is facilitated by the special muscular mechanism which preventsthe outflow of blood. The Vascular Nerves for the Trunk and Limbs. The skin andmuscles of the trunk receive their cutaneous and motor nerves by a seg-mental arrangement in which the innervation is by bands corresponding
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Fig. 210.—Plan of Distribution of Vaso-constrictor Nerves for the Fore Limbs. An. vi,Annulus of Vieussens. (Modified from Moret.) with the segments of the cord and the spinal nerves. It is much the samewith the vascular nerves; they are distributed to the skin and walls of thetrunk in the same segment in which they arise. Langley says that the suc-cessive bands overlap somewhat. In the fore legs or arms the vascular nerves arise from the first to thefifth dorsal spinal nerves, run to the stellate ganglia, then by the gray rami15 226 THE CIRCULATION OF THE BLOOD back through the ramus vertebralis to join those cervical nerves that enterinto the brachial plexus, figure 210. The nerves for the blood-vessels of the lower limbs arise from the tenthdorsal to the second lumbar nerves. These pass to the ganglionic chain,and gray rami are given off which join the lumbar plexus and run with thedivisions of that nerve complex to their distribution in the skin and muscles.Vaso-constrictors and

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