1026 



r lHE NERVE KVtiTKM 



obliquely across the outer surface of the Trape/ius and the acromion, and supply 

 the integument of the upper and hack part of the shoulder. 



The Deep Branches of the Cervical Plexus (Fig. 755). Internal Series. The 

 Communicating Branches consist of several filaments which pass from the loop 

 between the first and second cervical nerves to the vagus, hypoglossal, and sympa- 

 Jhetic. The branch to the hypoglossal ultimately leaves that nerve as a series 



ANTERIOR PRIMARY 



DIVISION OF, 



FOURTH CERVICAL 



BRACHIAL 

 PLEXUS 



INFERIOR 

 LARYNGEAU 



ROOT OF 

 LUNG 



PERICARDIA!. 

 BRANCH 



PHRENIC 



INFERIOR 

 CERVICAL 

 GANGLION 



INFERIOR 



LARYNGEAL 



NERVE TO 



SUBCLAVIUS 

 MUSCLE 



COMMUNICATING 

 BRANCH FROM 

 BRACHIAL PLEXUS 



THORACIC CARDIAC 

 BRANCH OF 

 VAGUS 

 INFERIOR 

 LARYNGEAL 

 ANTERIOR 

 PULMONARY 



ANTERIOR 



PULMONARY 



PLEXUS 



RAMIFICATIONS 

 OF PHRENIC 



FIG. 756. The phrenic nerve and its relations with the vagus nerve. (Toldt.) 



of branches viz., the descendens hypoglossi, the nerve to the Thyrohyoid, and 

 the nerve to the Geniohyoid (see p. 1014). Branches from all four cervical 

 nerves pass to the superior cervical ganglion of the sympathetic, while another 

 communicating branch passes from the fourth to the fifth cervical. 



Muscular branches supply the Anterior recti and Hectus lateralis muscles; they 

 proceed from the first cervical nerve, and from the loop formed between it and 

 the second. 



The Communicantes Hypoglossi (Fig. 755) consist usually of two filaments, 

 one being derived from the second and the other from the third cervical. These 



