. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Skeleton 541 The floor of the basket, which in man is larger than the top area, is bounded behind by the last thoracic vertebra together with the short twelfth pair of floating ribs attached thereto. On the sides and in front the margins of the floor are determined by the tips of the tenth and eleventh pairs of ribs and by the cartilages of other posterior ribs that attach the latter to the breastbone, as well as by the lower end of the breastbone itse
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Skeleton 541 The floor of the basket, which in man is larger than the top area, is bounded behind by the last thoracic vertebra together with the short twelfth pair of floating ribs attached thereto. On the sides and in front the margins of the floor are determined by the tips of the tenth and eleventh pairs of ribs and by the cartilages of other posterior ribs that attach the latter to the breastbone, as well as by the lower end of the breastbone itself. The floor is also closed crosswise by the vaulted diaphragm which separates the cavities containing the lungs and heart above from the abdominal cavity below. This partition, or floor, of the thoracic basket tends to slope backward from the sternum towards the backbone, while the slant of the margin around the space marking the smaller top of the basket slopes upward from the sternum towards the backbone, since the sternal length is shorter than the vertebral length. â Sternum ,^ Clavicle â ^h'S--'âTrachea JjjjQ Jugular Vein ^Ef^^T"Common Carotid Artery ^g^Jll"""Vagus Nerve jSKfrtrFirst Rib / "Esophagus C_/^ """"Vertebral Centrum """^"Scapula Fig. 449. Diagram of the anterior opening of the thoracic basket as seen from above. (After Witkowski.) In general, therefore, the contour of the whole basket is somewhat cone-shaped with the smaller, upper end towards the head. The space within the thoracic basket is partially divided into right and left spaces bulging dorsally like bay windows from the general cavity, since the upright column formed by the centra of the vertebrae, stacked one upon the other, stands out into the cavity, thus serving to a certain degree as a longitudinal partition. Within these lateral enlargements are packed the lungs. The heart lies midway between the lungs instead of far over on the
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
