Plexus

[pleks’-us) \_plectere, to knit]. A network, especially an aggregation of ve els or nerves forming an intricate network. P., Brachial, a plexus formed in the neck by the union of the anterior branches of the lower four cervical and the greater part of the first dorsal nerves. Its branches are the rhomboid, subclavian, supra scapular, external anterior thoracic, musculocutaneous, subscapular, median, musculospiral, posterior thoracic, internal anterior thoracic, internal cutaneous, le er internal cutaneous, and ulnar nerves. P., Cervical, a plexus in the neck formed by the anterior branches of the upper four cervical nerves. Its branches are the superficial, to skin of the head and neck; and the deep, the phrenic, com muni cans noni, two muscular, and two communicating branches. P., Choroid. See Choroid. P., Pam pin i form, the spermatic plexus, a plexus of veins collecting the blood from the testicle. 505