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Quiz 222-227
| Term | Definition |
|---|---|
| rectus abdominus | a major spine flexor; the name means "straight muscle of the abdomen" |
| pecturalis major | prime mover for shoulder flexion and adduction |
| deltoid | prime mover for should abduction |
| sternocleidomastoid | acting alone, each muscle of this pair turns the head toward the opposite shoulder |
| external obliques | forms the external lateral walls of the abdomen |
| seratus anterior | prime mover to protract and hold the scapula against the thorax wall; the boxers muscle |
| external and internal obliques; transverse and rectus abdominus | four muscle pairs that together form the abdominal girdle |
| linea alba | a seam ruing from the sternum to pubic symphysis; midline point of fusion |
| transverse abdominus | deepest muslce of the abdominal wall |
| external intercostal | deep muscles of the thorax that promote the inspiratory phase of breathing |
| diaphragm | acts in concert to accomplish inspiration (breathing in) |
| pecturalis minor | thoracic muscle deep to the major that acts to draw the scapula inferiorly or to elevate the rib cage |
| trapezius | muscle that enables you to shrug your shoulders or extend your head |
| latissmus dorsi | adducts the shoulder and causes extension of the shoulder joint |
| deltoid | the shoulder muscle that is the antagonist of latissmus dorsi |
| erector spinae | prime mover of back extension; composite muscle consisting of three columns |
| quadratus lumborum | fleshy muscle forming part of the posterior abdominal wall that helps to maintain upright posture |
| rhomboids | acting individually, small rectangular muscles that rotate the glenoid cavity of the scapulae inferiorly |
| teres major | synergist of latissimus dorsi in extension and adduction of the humerus |
| levator scapulae | synergist of the trapezius in scapular elevation; acts to flex the head to the same side |
| superspunatus | rotator cuff muscle; prevents downward dislocation of the humerus |
| infraspunatus | rotator cuff muscle; rotates the humerus laterally |
| teres minor | rotator cuff muscle; lies immediately inferior to the infraspinatus |
| serratus anterior | holds the scapula tightly against the thorax wall |
| trapezius | kite-shaped muscle pair that elevates, stabilizes, and depresses the scapulae |
| rhomboids | square the shoulders as they act together to retract the scapula |
| levator scapulae | elevates the scapulae |
| coccygeus and levator ani | two muscles forming the bulk of the pelvic diaphragm |
| deep transverse perineal muscle and external urethral sphincter | muslces that form the uroenital diphragm |
| bulbospongiosus, ischiocavernosus, and superficial transverse perineal muscle | muscles forming the superficial space |
| external urethral sphincter | muscle that constricts the urethra |
| bulbospongiosus | empies the urethra; assists in penile erection |
| levator ani | the most important muscle pair in supporting the pelvic viscera; forms sphincters at the anorectal junction |
| ischicavernosus | retards venous drainage and helps maintain penile erection |
| scalenes | elevates the first two ribs |
| erector spinae | prime mover of back extension; 3 muscle columns |
| quadratus lumborum | extends the lumbar spine and fixes the 12th rib |
| semispinalis | extends the vertebral column and head and rotates them to the opposite side |
| splenius | prime mover of head flexion; spasms of one causes torticolis |
| sternocleidomastoid | extends the head |
Created by:
stinsemi0043