Licence: Public Domain Mark
Credit: The anatomy of the thymus gland / by Sir Astley Cooper. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![sternum, and posteriorly to the origins of the sterno hyoidei and thyroidei muscles. It reaches more than half way down the sternum at birth, viz. to the fourth rib, and extends from thence into the neck near to the thyroid gland. It is connected to the sternum and oriijins of the sterno hyoidei and thyroidei muscles by cellular tissue, it adheres strongly by a coarse cellular membrane to the ])ericardium, anteriorly, and laterally the internal mammary arteries and yeins take their course. The reflection of the pleura descending from the carti- lages of the ribs on each side, and continued to the fore part of the pericardium forming the anterior mediastinum, makes its lateral boundaries, and separates it from the lungs; posteriorly it rests upon the yena innominata, and upon the fascia of the thorax which descends from the sternum and first rib to the curvature of the aorta, and to the three large vessels Avhich spring from it, viz. the arteria innominata the left carotid and left subclavian arteries : such then is the relative situation of the gland in the chest (see hereafter.) In the dissection of the cervical portion of the Thynms, the platysma myoides and external juguhu- vein are first turned aside, and the origins of the sterno mastoidci nuiscles are raised; when this has been accomplished, the sterno](https://iiif.wellcomecollection.org/image/b21300367_0034.jp2/full/800%2C/0/default.jpg)
