Anatomy Notes - Thorax - Anatomy Thorax Thoracic cavity...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Anatomy – Thorax Thoracic cavity surrounded by thoracic wall contains the thymus, heart, lungs, distal part of trachea, most of esophagus. Skeleton of thoracic wall forms osteocartilaginous thoracic cage. Contains 12 thoracic vertebrae and intervertebral discs, 12 pairs of ribs, and sternum. Thoracic vertebrae have costal facets on bodies for articulation with heads of ribs [joint of head of rib, along with adjacent intervertebral disc] facets on transverse processes for articulation with tubercles of ribs (except inf. 2) [costotransverse joint] superior demifacet art. w/ head of own rib; inferior demifacet art. w/ head of inf. rib Ribs – 12 pairs (1-7 = true, 8-10 = false, 11-12 = floating; unattached ant., end b/w muscles) Costochondral joints Head = 2 articular facets + crest Tubercle art. w/ transverse process Shaft – costal groove on inf. surface, lodges intercostal vessels and nerves Atypical ribs (1, 2, 10, 11 &12) 1 st has one art. facet, is broadest, shortest, most curved scalene tubercle (anterior scalene m.), groove of subclavian a. (ant.) and vein. (post.) 2 nd has has tuberosity for serratus ant. 10 th has single art. facet 11 th and 12 th have single art. facet, no neck or tubercle Sternum Manubrium (T3-T4)– jugular notch, 2 clavicular notches (sternoclavicular joints) manubriosternal joint (symphysis) – forms sternal angle [of Louis] Body (T5-T9) – costal notches 2-7, xiphisternal joint (synchondrosis); cartilagenous, ossified by age 40. Xiphoid process (T10) – ossified by age 40 Ligaments Radiate lig. - head of rib to body of vertebrae sup. and inf. Radiate sternocostal ligaments – costal cartilage to sternum Intraartciular lig. - manubrium to body Lateral costotransverse lig. - tubercle to tip of transverse process Superior costotransverse lig. - neck to transverse process superior to it Sternocostal joints (1-7) 1 st – cartilagenous (synchondrosis) 2-7 – synovial Thoracic cage superior aperture = inlet (bounded by T1, first pair of ribs, sup. border of manubrium) trachea, esophagus, V,A&N. inferior aperture = outlet (bound by T12, costal cartilages ribs 7-12, xiphisternal joint) closed by diaphragm, which allows structures to pass through. Inspiration – increase vertical, transverse, anteroposterior diameters, and intrathoracic volume. Anteroposterior diameter - costovertebral joints cause ribs 2-6 to rise like pump handles Pectoralis major and scalene muscles are accessory respiratory muscles. Intercostal nerves = ant. rami of T1-T12 (upper = T1-T6, lower = T7-T12) 11 pairs + 12 th subcostal nn. Dorsal rami of these nerves supply muscles, bones, joints, and skin of back 1
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Intercostal nn. Course: Run b/w parietal pleura, b/w internal and innermost intercostal muscles, through intercostal groove.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern