. The anatomy of the domestic animals. Veterinary anatomy. EESPIRATOEY SYSTEM OF THE PIG—THE NASAL CAVITY 545 with the chest-wall and apical lobe of the left lung as far back as the thirti rib. Its right face is largely molded on the great vessels in front of the heart. The cervical part forms the l)ulk of the gland; it consists of right and left lobes which extend along the trachea anrl oesophagus from the thoracic inlet to the thyroid gland. The two lobes are large at the root of the neck, where they are in apposition. FiQ. 485.—Thy-mub of Young Calf. a, Thymus (cervical part): 6, trachea; c
. The anatomy of the domestic animals. Veterinary anatomy. EESPIRATOEY SYSTEM OF THE PIG—THE NASAL CAVITY 545 with the chest-wall and apical lobe of the left lung as far back as the thirti rib. Its right face is largely molded on the great vessels in front of the heart. The cervical part forms the l)ulk of the gland; it consists of right and left lobes which extend along the trachea anrl oesophagus from the thoracic inlet to the thyroid gland. The two lobes are large at the root of the neck, where they are in apposition. FiQ. 485.—Thy-mub of Young Calf. a, Thymus (cervical part): 6, trachea; c, isthmus of thyroid gland; d, laryngeal prominence; ?, apical lobe of right lung; ;2, heart (left ventricle); 5, pulmonary artery; 4i aorta; J, i', oesophagus: '>', m. iongus colli; 7, diaphragm. and cover the trachea, oesophagus, carotid arter}', and vago-sympathetic trunk. Further forward they gradually diminish in size and diverge to the sides of the trachea. They are related superficially to the sterno-cephalicus, sterno-thyro- hyoideus, and external jugular vein. It undergoes atrophy slowly and remnants of the thoracic part often remain even in advanced age. RESPIRATORY SYSTEM OF THE PIG THE NASAL CAVITY The nostrils are small, and are situated on the flat anterior surface of the rostrum or snout (Rostrum suis). The latter is a short cylindrical projection, with which the upper lip is fused, and is circumscribed by a prominent circular margin. The skin on the snout is thin and highly sensitive; it presents small pores, and scattered over it are fine short hairs. In the snout between the nostrils is the OS rostri, which is to be regarded as a special development of the extremity of the septum nasi in adaptation to the habit of burrowing or rooting. A plate of cartilage, representing the lamina of the alar cartilage of the horse, curves ventro- laterally from the dorsal part of the os rostri, and a pointed bar of cartilage curves upward from the lower part of the bon
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialondon
