. Regional anesthesia : its technic and clinical application . e side of the neck theypass beneath the clavicle and enter the axilla through its apex. Thebrachial plexus is, therefore, divided into two portions: a cervical orsupraclavicular, and an axillary or infraclavicular portion. The supra- I»2 REGIONAL ANESTHESIA clavicular portion of the plexus has the shape of a triangle, having itsbase attached to the cervical vertebral column and its apex at theclavicle. It lies first above and then on the outer side of the subclavianartery and vein, and is frequently threaded by the transverse cervi
. Regional anesthesia : its technic and clinical application . e side of the neck theypass beneath the clavicle and enter the axilla through its apex. Thebrachial plexus is, therefore, divided into two portions: a cervical orsupraclavicular, and an axillary or infraclavicular portion. The supra- I»2 REGIONAL ANESTHESIA clavicular portion of the plexus has the shape of a triangle, having itsbase attached to the cervical vertebral column and its apex at theclavicle. It lies first above and then on the outer side of the subclavianartery and vein, and is frequently threaded by the transverse cervicalor posterior scapular artery. In the axilla the component parts of theplexus form a close fasces around the axillary artery, although lying BrancKes to -ph-cenLC n. Tlerve to an§. 5cap. RhoraboLd u- Cutaneous br. -. BcaricK toteres mtno brITluscuLo-cutaneous TiTTlusculospLral orradLal tl.——TnedLan n- Ulnar n. —Internal outaneousLesser cutaneous nFig. 149.—Diagrammatic illustration of tlie brach PKrentc n,.. Ant thoraotcrisrves , showing the supraclavicular id infraclavicular branches of the plexus. The posterior d are colored pale. on the outer side of it. Before dividing into its terminal branches itlies enclosed between the pectoralis minor and subscapularis fifth and sixth cervical nerves unite to form the outer or uppertrunk; the eighth cervical and first thoracic unite to form the inner orlower trunk; the seventh cervical remains alone as the middle emerging from the scaleni muscles, each of these trunks separateinto an anterior and a posterior division. The six divisions, three BLOCKING OF SPINAL NERVES 183 anterior and three posterior, unite differently to form tliree cords, fromwhich branches are given off which can be divided into two groups, viz.:supraclavicular and infraclavicular. Scalenus anticubialenu. niedius
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