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BIO201-Ch10-MusSys-3

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

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

 



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