. Anatomy, descriptive and applied. Anatomy. THE LUMBOSACRAL PLEXUS 1045. The mode in which the plexus is arranged varies in different subjects.^ It differs from the brachial plexus in not forming an intricate interlacement, but the several nerves of distribution arise from one or more of the spinal nerves in the following manner: The first lumbar nerve receives a branch from the last tho- racic, gives off a larger, upper branch, which sub- divides into the iliohypo- gastric and ilioinguinal nerves; and a smaller lower branch which unites with a branch of the second lumbar, to form —--i-—:=S-^
. Anatomy, descriptive and applied. Anatomy. THE LUMBOSACRAL PLEXUS 1045. The mode in which the plexus is arranged varies in different subjects.^ It differs from the brachial plexus in not forming an intricate interlacement, but the several nerves of distribution arise from one or more of the spinal nerves in the following manner: The first lumbar nerve receives a branch from the last tho- racic, gives off a larger, upper branch, which sub- divides into the iliohypo- gastric and ilioinguinal nerves; and a smaller lower branch which unites with a branch of the second lumbar, to form —--i-—:=S-^/ / i-" the genitofemoral nerve. iuiohvpogasth The remainder of the ilio-inguin—^ ^^^ / •/ ^^ y. m second nerve and the third and fourth lumbar ... GENITOFEMOI,-^ - ^ , i_ / / ^ ^ 1 lu nerves divide mto anterior ^^^^ ^ ' /t^//^/ ^^ l iv and posterior divisions. cutaneous The anterior division of the second unites with the / /^ /^/ j// // ..-?- l v anterior division of the third nerve and a part of ^° '"^" the anterior division of femoral (antei the fourth nerve to form cruraO^^^ obturator^ the obturator nerve. The Fig. 775.—Diagram of the lumbar plexus. remainder of the anterior division of the fourth nerve passes down to communicate with the fifth lumbar nerve. The posterior divisions of the second and third nerves divide into two branches, a smaller branch from each uniting to form the external or lateral cutaneous nerve, and a larger branch from each, joining with the posterior division of the fourth lumbar nerve to form the femoral or anterior crural nerve. The accessory obturator, when it exists, is formed by the union of two small branches given off' from the third and fourth nerves. The branches of the lumbar plexus may therefore be arranged as follows: Iliohypogastric • ^ 1,L. Ilioinguinal 1,L. Genitofemoral 1,2, L. Dorsal Divisions. External (or lateral) cutaneous 2, .3, L. Femoral (or anterior crural) 2, 3, 4, L. Ventral Divisions.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
