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BIO201 - Ch 10 - Muscular System Trunk & Pelvis - Marieb/Hoehn - Rio Salado - AZ

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Question
Answer
Which muscles flex, rotate neck, & elevate first 2 ribs to aid in inspiration?   The scalenes - anterior/middle/posterior - N=Cranial spinal nerves.  
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Trunk extension is effected by which muscles?   Deep/intrinsic back muscles of bony vertebral column.  
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The largest of the deep back muscles group is?   The erector spinae - prime mover of back extension - 3 colums - iliocostalis,longissimus&spinalis.  
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Which back muscles go into painful spasms following injury to back structures?   Erector spinae  
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During vertebral movement, the __ of veretebra to next.   The rotatores, multifidus, interspinales, & intertransversarii  
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Primary function of deep thorax muscles is?   Promote movements necessary for breathing.  
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Thoracic muscles are very __, extending only from one rib to the next.   Short  
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The external intercostal muscles   Inspiratory muscles-more superficial-lift rib cage - 11 pairs, N=Intercostal Nerves  
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The internal intercostal muscles   Deeper-aid forced expiration by depressing rib cage-11 pairs, N=Intercostal Nerves  
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Name the most important muscle of inspiration.   Diaphragm - prime mover - N=Phrenic nerves  
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The external & internal intercostal layers run __.   Obliquely & at right angles to each other.  
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The anterior & lateral abdominal wall lack __.   Bony reinforcement  
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Which 4 muscles form lateral ab. walls?   External oblique, internal oblique, transverse abdominis, & rectus abdominis - all N=Intercostal Nerves  
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List ab. muscles from deep to superficial   Transversus abdominis, rectus abdominis, internal oblique, external oblique  
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Which 2 paired muscles form pelvic floor?   Levator ani ("raises anus") & coccygeus  
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External uretral spincter   Spincter muscle that surrounds uretra & allows voluntary control of urination.  
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Superficial space   Contains ischiocavernosus & bulbospongiosus that helps maintain erection of penis & clitoris  
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External anal sphincter   Encircles anus which allows voluntary control of defecation.  
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Forms muscular "sling" around male prostrate or vagina - supports pelvic viscera.   Levator ani ("raises anus"), N=Inferior rectal nerve.  
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Maintains erection of penis or clitoris   Ischiocavernous - N=Pudendal nerve  
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Raphe   Seam of fibrous tissue  
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Name the muscles of the anterior & thorax.   Pectoralis major, pectoralis minor, serratus anterior, & subclavius.  
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