Bony Thorax PDF

TH-L-01-Bony-thorax Bony Thorax Dr Ayida Al Wahaibi AY-24-25  Objectives 1. Describe the skeletal components of the thoracic cage and the joints that exist between these components. 2. Describe the boundaries of the thorax, its inlet. 3. List the structures passing the tho...

TH-L-01-Bony-thorax Bony Thorax Dr Ayida Al Wahaibi AY-24-25  Objectives 1. Describe the skeletal components of the thoracic cage and the joints that exist between these components. 2. Describe the boundaries of the thorax, its inlet. 3. List the structures passing the thoracic inlet. 4. Identify anatomical landmarks of the thoracic region. 2  Osteology of the Thoracic Cage Thoracic skeleton is strong, and its joints allow rib position changes. Sternum Manubrium Body Xiphoid process Ribs Thoracic vertebral column Scapula 3  Osteology of the Thoracic Cage Anterior view Posterior view Lateral view https://www.visiblebody.com/blog/3d-skeletal-system-bones-of-the-thoracic-cage 4 Osteology of the Thoracic Cage Anterior view Posterior view Source: Human Anatomy Atlas 5  Sternum Manubrium Body of sternum forms a junction with the manubrium called the Sternal angle. Xiphoid Process Located at the level of the T9 thoracic vertebra https://pressbooks- and the T7 dermatome. dev.oer.hawaii.edu/anatomyandphys iology/chapter/the-thoracic-cage/ 6 Sternum https://pressbooks- dev.oer.hawaii.edu/anatomyandphys iology/chapter/the-thoracic-cage/ 7  Ribs A rib = cartilage + bone + joint facets. Humans have 24 ribs (12 pairs). Costal cartilages of ribs 1 to 7 attach to sternum (most are synovial joints). Ribs 8, 9 & 10 attach to cartilage above. Ribs 11 & 12 have no attachment. https://pressbooks- dev.oer.hawaii.edu/anatomyandphys iology/chapter/the-thoracic-cage/ 8  Ribs Attached to the sternum through the “True Ribs“ Ribs 1 -7 costal cartilage Sharing a common “False Ribs“ cartilaginous Ribs 8, 9 & 10 connection to the sternum Ribs “Floating Ribs” Ribs 11 & 12 Attached to the 9 vertebrae only Ribs Chest Radiograph 10 Source: Radiology Masterclass Ribs In Chest Radiograph T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 11 Typical Ribs http://web.donga.ac.kr/ksyoo/department/education/ 12 grossanatomy/doc/html/rib-t.html  Atypical Ribs The atypical ribs are the 1 , 10 , 11 and 12. st th th th Why these ribs are called atypical? List important structures making impression on the superior surface of the first rib. 13  Thoracic Vertebral Column What are the characteristics and components of the thoracic vertebra? 14 Source: Human Anatomy Atlas  Scapula: Borders & Fossae Source: Human Anatomy Atlas Glenoid fossa lined by glenoid labrum, which deepens the cavity. 15  Scapula: Fossae The Subscapular Fossa Subscapularis. The Supraspinous fossa Supraspinatus. The infraspinous fossa Infraspinatus https://commons.wikimedia.org/wiki/File:Cunn ingham%E2%80%99s_Text- 16 book_of_Anatomy_%281914%29_- _Fig_190.png  Costal Joints Costosternal joint 1. Sterno-costal joints Rib 1: Synchondrosis Ribs 2-10: Synovial joints Radiate sterno-costal ligaments connect the costal cartilages of ribs Costochondral joint https://quizlet.com/17515278 1/anatomy-final-flash-cards/ 17  Costal Joints 2. Sternal angle (Angle of Louis ): A synchondrosis joint. It cartilage usually does not become ossified until old age. The sternal angle marks the level of the 2 costal nd cartilage. https://quizlet.com/17515278 1/anatomy-final-flash-cards/ 18  Costal Joints 3. Sterno-clavicular Joint: A gliding synovial joint with a wider than normal range of motion. https://quizlet.com/17515278 1/anatomy-final-flash-cards/ 19  Costal Joints 4. Xiphisternal joint: A synchondrosis Marks the inferior extent of the thoracic cavity. The cartilage within this joint usually becomes https://quizlet.com/17515278 ossified in old age. 1/anatomy-final-flash-cards/ 20  Costal Joints 5. Costovertebral joint 6. Costotransverse joint Body of the T6 corresponding vertebra Rib7 Body of the vertebra T7 above Intervertebral disc between T8 them. Reinforced by intra-articular https://quizlet.com/51211903 ligament. 6/costovertebral-joints- diagram/ 21  Costal Joints Costovertebral joint Costotransverse joint https://www.flickr.com/photos/internetarchi vebookimages/14578078458 22  Thoracic Inlet Also known as the superior thoracic aperture. Boundaries: Posterioly: T1 vertebra. Laterally: the first pair of ribs Anteriorly: the costal cartilage of the first rib and the superior border of the manubrium. 23  Structures Passing Through The Thoracic Inlet Also the thoracic duct https://www.researchgate.net/figure/Anatomy-of-the-thoracic- 24 inlet-The-trachea-is-commonly-located-anterior-and-right- lateral_fig1_337751428  Landmarks 1. Jugular notch corresponds with The 2 thoracic vertebra in male and nd The 3 thoracic vertebra in female rd http://www.wikiradiograp 25 hy.net/page/Thorax  Landmarks 2. Sternal angle Corresponds with; The lower border of 4 thoracic vertebra th The bifurcation of trachea in the adult. The beginning and end of aortic arch. http://www.wikiradiography.net/page /Thorax 26  Reading Anatomy for Dental Students, 4thedition. Section 2: Chapter 9, the surface anatomy of the thorax, pp. 66-68. Chapter 10, The thoracic wall & diaphragm, pp. 70 – 73. 28