| phrenic plexus | Plexus phrenicus, an autonomic plexus surrounding the inferior phrenic artery. (05 Mar 2000) |
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| accessory phrenic nerves | Accessory nerve strands that arise from the fifth cervical nerve, often as branches of the nerve to the subclavius, passing downward to join the phrenic nerve. Synonym: nervi phrenici accessorii. (05 Mar 2000) |
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| pericardial branch of phrenic nerve | <anatomy, nerve> One of the branches of phrenic nerve distributed to the pericardium and adjacent mediastial parietal pleura. Synonym: ramus pericardiacus nervi phrenici. (05 Mar 2000) |
| phrenic | <anatomy> Of or pertaining to the diaphragm; diaphragmatic; as, the phrenic nerve. Origin: Gr, the midriff, or diaphragm, the heart, the mind: cf. F. Phrenique. Source: Websters Dictionary (01 Mar 1998) |
| phrenic ampulla | A physiologic localised dilatation of the distal oesophagus, commonly demonstrated by oesophagography. (05 Mar 2000) |
| phrenic ganglia | Several small autonomic ganglia contained in the plexuses accompanying the inferior phrenic arteries. Synonym: ganglia phrenica. (05 Mar 2000) |
| phrenic nerve | <anatomy, nerve> The motor nerve of the diaphragm. The phrenic nerve fibres originate in the cervical spinal column (mostly c4) and travel through the cervical plexus to the diaphragm. (12 Dec 1998) |
| phrenic nucleus | A nucleus comprised of motor neurons located in medial areas of the ventral horn of the spinal cord from about C3 to C6; axons of neurons in this nucleus innervate the diaphragm. (05 Mar 2000) |
| phrenicoabdominal branch of phrenic nerve | <anatomy, nerve> Terminal branches of phrenic nerve providing motor innervation of diaphragm and sensory innervation to the diaphragm and the diaphragmatic pleura and peritoneum. Synonym: rami phrenicoabdominales nervi phrenici. (05 Mar 2000) |
| phrenic pleura | The layer of parietal pleura covering the upper surface of the diaphragm, except along its costal attachments and where it is covered with the pericardium. Synonym: pleura diaphragmatica, phrenic pleura, pleura phrenica. (05 Mar 2000) |
| phrenic pressure test | Pressure is made on the phrenic nerve on each side, above the clavicles where the nerve passes over the scalenus anticus muscle; if pain is felt and the patient inclines his head to the painful side, the problem is in the pleural space; if his head does not incline to one side, the problem is in the abdominal cavity. (05 Mar 2000) |
| phrenic veins | See: inferior phrenic vein, superior phrenic veins. (05 Mar 2000) |
| crossed phrenic phenomenon | Hemisection of the cord above the exit of the phrenic nerve paralyzes the ipsilateral half of the diaphragm; if the contralateral phrenic nerve is then sectioned or blocked, contractions on the ipsilateral side are resumed. (05 Mar 2000) |
| superior phrenic artery | <anatomy, artery> One of a pair of small arteries given off from the thoracic aorta just superior to the diaphragm; distribution, diaphragm; anastomoses, musculophrenic, pericardiacophrenic, and inferior phrenic. Synonym: arteria phrenica superior. (05 Mar 2000) |
| superior phrenic lymph nodes | Three groups of small nodes, anterior, middle, and posterior, on the upper surface of the diaphragm; they receive afferents from the liver, diaphragm, and intercostal spaces and send efferents to parasternal and posterior mediastinal nodes. Synonym: nodi lymphatici phrenici superiores, diaphragmatic nodes. (05 Mar 2000) |
| superior phrenic veins | Small veins that drain the upper surface of the diaphragm; they are tributaries of the azygos and hemiazygos veins. Synonym: venae phrenicae superiores. (05 Mar 2000) |