176 THE POCKET ANATOMY 



3. Ganglia of union with cranial nerves viz., ophthal- 

 mic, spheno-palatine, otic, and submaxillary. These 

 have been described with the 5th nerve. 



THE GREAT GANGLIATED CORDS, 



two in number, extend the whole length of the vertebral 

 column. They consist of ganglia, united by intervening 

 cords, and are placed partly in front and partly by the side 

 of the vertebras. Above they are connected with two plexuses 

 entering the cranium, and below they join together in a loop 

 over the coccyx. The parts of the cords are named accord- 

 ing to the region they occupy viz., cervical, dorsal, lumbar, 

 and sacral. The cervical portion has three ganglia, whilst in 

 the rest of its extent each cord contains ganglia equal in 

 number to the vertebrae. 



Each ganglion is connected with the anterior primary division 

 of the corresponding spinal nerve by an afferent (white) 

 filament, and an efferent (grey) connecting branch. The 

 interganglionic cords are composed of white and grey fibres, 

 the former being continuous with the filaments from the 

 spinal nerves. 



The CERVICAL PART of the gangliated cord lies behind the 

 carotid sheath, just in front of the prevertebral muscles, and 

 contains three ganglia. 



i. The SUPERIOR CERVICAL GANGLION lies on the rectus 

 capitis anticus major behind carotid sheath, opposite the and 

 and 3rd cervical vertebras. 



Branches : 



Connecting : with the anterior primary divisions of ist, 2nd, 

 3rd, and 4th cervical nerves : with the ganglion of trunk and 

 the ganglion of the root of the pneumogastric, with the hypo- 

 glossal, with the petrous ganglion of the glosso-pharyngeal. 



Pharyngeal nerves and plexus : the pharyngeal nerves are 

 given off from the front of the superior cervical ganglion, and 

 pass forwards and downwards. They join with branches 

 from the pneumogastric and glosso-pharyngeal nerves forming 

 the pharyngeal plexus, which lies on the middle constrictor 

 muscle. Branches from the plexus supply the constrictors, 

 levator palati, palato-glossus, palato-pharyngeus, andazygos 

 uvulae muscles : the motor fibres are derived from the 

 bulbar part of spinal accessory, and reach plexus through 

 pharyngeal branch of vagus. 



The upper cardiac nerves : the right upper cardiac nerve 

 comes off by two roots from the upper cervical ganglion. It 

 passes downwards behind the carotid sheath, but in front of 

 the inferior thyroid artery and recurrent laryngeal nerve. It 



