Human anatomy, including structure and development and practical considerations . h of the coniixjnent nerve-hundlfs in their several portions, division and iniion taking place at ditlerent levels in differentindividuals. The fifth cervical nerve may pass in fnjnt of ur through the scalenus anticus. Thesi.\th, tiiough not so fre(|uently as the fifth, may traverse the scalenus anticus. The seventhcervical nerve, as the middle trunk, may hreak up into three branches, one going to each ofthe three cords. The fibres of the posterior cord may arise from only the seventh and eighth,or the sixth, sev
Human anatomy, including structure and development and practical considerations . h of the coniixjnent nerve-hundlfs in their several portions, division and iniion taking place at ditlerent levels in differentindividuals. The fifth cervical nerve may pass in fnjnt of ur through the scalenus anticus. Thesi.\th, tiiough not so fre(|uently as the fifth, may traverse the scalenus anticus. The seventhcervical nerve, as the middle trunk, may hreak up into three branches, one going to each ofthe three cords. The fibres of the posterior cord may arise from only the seventh and eighth,or the sixth, seventii and eighUi cervical ner\es. IMexuses have been seen in which only twocords, a smaller and a larger, were present, the latter taking the place of either the inner andouter or the inner and posterior cords. Communications.—The five nerves comprising the source of the plexus areconnected to the sympathetic system by gray rami communicantes and there ispossibly a white ramus communicans passing from the first thoracic nerve to thefirst thoracic ganglion of the I. cervical ner\-eII. cervical ner\e III. cervical nerve IV. cervical ner\-e Vertebral artery V. cer\-ical iien-e Scalenus niedius muscle VI. cercal nerve VII. cer\Mcal ner\e VIII. cer\ical ner\-e I. thoracic ner\-e External anterior thoracic Suprascapular ner^eCpper subscapular ner\e Outer cord of plexusPosterior cord of pieCircumflex nerveDeltoid mtiscle Musculo-cutaneoub nerveMedian ner\-e Ilnar ner\-e Mu>culo-spiral ner\-Internal cutaneousLesser internal cutaneous nerve Internal anteriorthoracic ner\-eInsertion ofscalenus anticusPosteriorthoracic ner\-e I. rib n. ribInner cord of plexus Middle subscapular nerv-eLower suljscapular nen*e Deep dissection of neck, showing constitution of right brachial plexus. Practical Considerations.—Sensor>- disturbances are rather rare in thedistribution of the brachial plexus of nerves, but motor troubles are comparativelycommon, and are sometimes asso
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
