01:377:213 Study Guide - Midterm Guide: Thoracic Cavity, Pectoralis Major Muscle, Accessory Muscle
3 Aug 2018
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Ribs (anything with the word cost- pertains to the ribs. ) a. Tietze"s disease: inflammation of the sternochondral and costochondral joints. Pectoralis major: consists of three heads: clavicular, sternal, abdominal. Pectoralis minor: accessory muscle of respiration a. b. Serratus anterior: consists of three heads (clavicular, sternal, and abdominal) only need to identify. a. b. External intercostals: outermost layers of muscle between the ribs. a. b. Elevates ribs used for forceful inspiration of the ribs (accessory muscle of respiration). Internal intercostals: middle layer of muscles between the ribs. a. b. c. Depresses ribs helps with forced expiration (accessory muscle of respiration). Innermost intercostal: run laterally from superior to inferior; separated from the internal intercostal by the intercostal vasculature a. *fibers change directions between external and internal intercostal. The far posterior view of the thoracic cavity (back of ribcage) i. Transversus thoracis: located underneath the ribcage looks like a christmas tree". a.
