. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 346 DISCOVERY REPORTS It may be observed also that there is an increasingly generous blood supply to the intercostal muscles proceeding forwards. The branches from the posterior thoracic are bi-seriate (Fig. 6), and tend to be of larger calibre rostrally than posteriorly. The posterior thoracic arteries and veins corre- spond to a much enlarged and accentuated superior intercostal system, such as is found in other mammals. By their contact with the rete mirabile the first two intercostal spaces
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 346 DISCOVERY REPORTS It may be observed also that there is an increasingly generous blood supply to the intercostal muscles proceeding forwards. The branches from the posterior thoracic are bi-seriate (Fig. 6), and tend to be of larger calibre rostrally than posteriorly. The posterior thoracic arteries and veins corre- spond to a much enlarged and accentuated superior intercostal system, such as is found in other mammals. By their contact with the rete mirabile the first two intercostal spaces are probably the most generously supplied with blood of the whole series. RELATION TO NERVES The pneumo-gastric nerve (Fig. 3 d2 and Fig. 7/) accompanies the carotid artery and the jugular vein, passing above the short subclavian vein and under the subclavian artery to its destination in the roots of the lungs and heart. The phrenic (Fig. 3 d> and Fig. 7/) is de- rived from the 4th cervical spinal nerve, and accompanies the pneumo-gastric as far as the great vessels, where it diverges and crosses the body of the lung to the diaphragm. The 5th, 6th, 7th and 8th cervical spinal and the 1st thoracic spinal nerves (Fig. 7 cr5-8, tr1) contribute to the cervico-brachial plexus, passing through a slit in the scalene muscle to reach it. The cervical sympathetic chord (Fig. yg) accompanies the pneumo-gastric as far as the 7th cervical vertebra, where it passes outwards and somewhat upwards into the. Fig. 7. Nervous relations of the thoracic rete. The rete is dotted. Part of the posterior thoracic vein has been omitted in order to show the nerves underneath. /, Pneumo-gastric nerve k, Retial ganglion g, Cervical sympathetic chord /, Phrenic nerve //, Thoracic sympathetic chord /', Middle cervical sympathetic ganglion j, Posterior cervical sympathetic ganglion a, Dorsal aorta b, Carotid artery c, Jugular vein d, Posterior thoracic vein e, Pulmonary artery cr3~B, Cervical spinal nerves
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