BIO201 - Ch 10 - Muscular System Trunk & Pelvis - Marieb/Hoehn - Rio Salado - AZ
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 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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