ANAT20006 Lecture Notes - Lecture 22: Anterior Ramus Of Spinal Nerve, Intercostal Arteries, Intercostal Nerves
15 Aug 2018
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Document Summary
* the thoracic walls protect the internal organs within the thoracic cavity. * the thoracic walls are a mechanical basis for breathing because the thoracic walls move in and out, it contributes to our breathing. * the thoracic walls include the thoracic cage, muscles and coverings (skin, superficial fascia, subcutaneous structures, breasts) * sternum (made of three components) manubrium. Body of sternum (majority of the sternum) * 12 pairs of ribs and costal cartilage. * the costal cartilage of ribs 1-7 directly articulate with the sternum (manubrium or body of sternum) and ribs 8-10 articulate with the sternum using the costal cartilage from the rib above. * ribs 11-12 have no costal cartilage associated with them and anteriorly these ribs do not articulate with any structure/do not articulate with the sternum and therefore are known as the floating ribs. * 12 thoracic vertebrae and their corresponding intervertebral discs. * costal margin the jointed costal cartilage of ribs 7-10.
