Human anatomy, including structure and development and practical considerations . tlie nerve to the subclavius. A branch of comnumication with the external anteriorthoracic and a l)rant:h to the clavicular head of tin- sterno-cleido-mastoiil have been noted. 5. The communicating branch to the phrenic nerve (F\ir. 1090) arisesusually from the tifth ccrxical nerve, sometimes from the fifth and Originatiniq;at the outer margin of the scalenus anticus it passes inward and joins the phrenic. Ifthis ner\e is not present the nerve to the subclavius usually supplies the deficiency. II. The Inf
Human anatomy, including structure and development and practical considerations . tlie nerve to the subclavius. A branch of comnumication with the external anteriorthoracic and a l)rant:h to the clavicular head of tin- sterno-cleido-mastoiil have been noted. 5. The communicating branch to the phrenic nerve (F\ir. 1090) arisesusually from the tifth ccrxical nerve, sometimes from the fifth and Originatiniq;at the outer margin of the scalenus anticus it passes inward and joins the phrenic. Ifthis ner\e is not present the nerve to the subclavius usually supplies the deficiency. II. The Infraclavicular Branches.—These branches comprise those g^ivenoff by the three cords of the j)le.\us after the latter has j)assed beneath the cla\icleinto the axilla. 6. TlIK ANTERIOR THORACIC NeRVE. The anterior thoracic nerve (n. thoracalis anterior lateralis) (Fig. 1093)receives its fibres from the fifth, sixth and seventh cervical nerves. Leaving the outercord beneath the clavicle, it passes mesially over the axillary artery and, after giving Fig. Musculo-spiralnerveUlnar nerve Lesser internal cutaneousnerveInternal cutaneous ners-e Scalenusanticus muscle Subclavian arterv Subclavian vein Dissection of right axilla, showing relation of brachial plexus to subclavian and axillary vessels with arm abducted. off a filament which unites with a similar structure from the internal anterior thoracicnerve, divides into two branches which pierce the costo-coracoid membrane and enterthe deep surface of the pectoralis major. The upper branch supplies the clavicularportion of the muscle and the lower branch the upper part of the sternal portion. The loop between the anterior thoracic ner\es gives off a filament which piercesthe pectoralis minor and ends in the sternal part of the pectoralis luajor, to both ofwhich muscles it is distributed. Variations.—This nerve may supply fibres to the clavicular portion of the deltoid and to theacromio-clavicular articulat
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
