Anatomy Notes

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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesNov 2411 The thoracic cage includes the vertebral column the ribs and the sternum Sternum Lies in the anterior midline of the thorax It is formed by the fusion of three bonesmanubrium body and xiphoid process The superior end of the manubrium is the jugular notch The clavicular notches of the manubrium articulate with the clavicles superolaterally The manubrium also articulates with ribs 1 and 2 It is attached to the body at the sternal angle The body articulates with costal cartilage of ribs 27 The body is attached to the xiphoid process at the xiphisternal joint The manubrium and rib 1 articulate to form the thoracic inlet The thoracic outlet is enclosed by the diaphragm When we inhale ribs move up and out Ribs get larger from 17 then get smaller from 712 17 true ribs have costal cartilage at point where they interact with sternum Ribs 812 are false ribs Ribs 810 dont have own attachment to sternum They attach to costal cartilage of rib 7 Ribs 11 and 12 are floating ribs because they dont attach to the sternum at all Structure of rib At the anterior end is the costal cartilage which is where it articulates with the sternum Then there is the shaft or body The costal groove is located on the inner face of the body and this is where intercostal nerves and vessels are located It then angles around Then at the posterior end are the tubercle neck and head The head has a superior facet and inferior facet and these articulate with the vertebral column The inferior facet articulates with the body of the thoracic vertebra of the same number and the superior facet articulates with the one above The tubercle articulates with the transverse process of the thoracic vertebra of the same number Ribs 1 1012 articulate with only one vertebral body Ribs 11 and 12 do not articulate with a vertebral transverse process The costaltransverse ligament is located near the tubercle and it anchors the neck with the transverse process The radiate ligament anchors th
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