CHAPTER 2 – ANATOMY OF RESPIRATION
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57. The serratus posterior superior muscles (elevate/depress) ____________________ the rib cage.
58. The ____________________ muscle elevates the sternum and clavicle, and also rotates the head.
59. The ____________________ muscle is actually a muscle of the arm, and elevates the rib cage by means of sternal and
clavicular muscular components.
60. The ____________________ muscle is a massive muscle of inspiration making up the superficial upper back and
neck; it originates along the spinous processes of C2 to T12 by means of fascial connection.
61. The _________________________ muscles are posterior thoracic muscles of inspiration that elevate the rib cage.
Each portion originates on a transverse process of a vertebra (from C7 through T11), for a total of 12 muscles. Fibers
course obliquely down and out to insert into the tubercle of the rib below.
62. The _________________________ muscle originates on the spinous processes of C7 and T1 through T3. Fibers from
these muscles course down and laterally to insert just beyond the angles of ribs 2 through 5. This group of muscles
elevates the rib cage during inspiration.
serratus posterior superior
63. The ____________________ muscle is found on the inner surface of the rib cage, originating on the margin of the
sternum, with fibers coursing to the inner chondral surface of ribs 2 through 6. Contraction of this muscle resists elevation
of the rib cage and decreases the volume of the thoracic cavity.
64. The _________________________ muscles originate on the spinous processes of the T11, T12, and L1 through L3
vertebrae and course up and laterally to insert into the lower margin of the lower five ribs. Contraction of these muscles
pulls the rib cage down for expiration.
serratus posterior inferior
65. The ____________________ hiatus is the opening of the diaphragm that permits connection of the pharyngeal region
with the stomach.
66. What are the three major structures of respiration?
The three major structures of respiration are:
1. Bony thorax, which contains the vertebrae, vertebral column, ribs, pectoral girdle, sternum, and pelvic
girdle.
2. Visceral thorax, which contains the respiratory passageway, lungs, and the mediastinum.
3. Muscles of respiration, which contain the diaphragm, accessory muscles of inspiration, accessory
muscles of expiration, and muscles of postural control.
67. What are the three classes of ribs?