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muscles

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Terms in this set (33)

  • transversospinal group muscles

    semispinalis, multifidus, rotatores muscles

  • transversospinal group function

    extend head, neck, vertebral column

  • quadratus lumborum muscle

    helps extend and laterally flex vertebral column

  • diaphragm

    muscle that separates the thoracic and abdominopelvic body cavities

  • inspiration

    diaphragm contract and flattens and pulls thoracic cavity and lungs with it, increasing size and volume of lungs

  • passive expiration

    when diaphragm relaxes, volume of thoracic cavity decreases

  • external intercostal muscles

    raise and spread ribs to assist with inspiration

  • internal intercostal muscles

    depress rib cage causing forced expiration

  • forced inspiration

    sternocleidomastoid and scalenes also elevate the rib cage

  • rectus abdominis muscle

    superficial muscle of anterior abdomen, powerful flexor of trunk

  • rectus sheath

    encloses rectus abdomen muscle

  • linea alba

    central tendon along midline of rectus abdominis muscle

  • rectus abdominis muscle

    divided into sections by bands of dense regular colagenous connective tissue, six pack look

  • external and internal obliques

    rotate trunk and flex it laterally

  • transversus abdominis muscle

    compresses the abdominal cavity, which raises intra-abdominal pressure

  • rectus abdominis, external and internal obliques common function

    raise intra-abdominal pressure when contracted together, urination, defecation, childbirth, forced expiration(coughing)

  • pelvic floor or pelvic diaphragm

    broad, flat sheet that essentiall holds all organs inside pelvis

  • levator ani muscle parts

    pubococcygeus, iliococcygeus, ischiococcygeus muscles and anococcygeal ligament

  • pubococcygeus

    anterior of levator ani muscle

  • iliococcygeus

    middle of levator ani muscle

  • ischiococcygeus

    posterior of levator ani muscle

  • anococcygeal ligament

    extends from rectum to coccyx and is an insertion site for all three muscles

  • perineum

    inferior to pelvic diaphragm, diamond shaped lies between proximal thighs and contaoins external genitalia , openign of anus

  • urogenital diaphragm

    urethra passes through in male, urethra and vagina pass through in female

  • urogenital diaphragm parts

    external urethral sphincter, deep transverse perineal muscle

  • external urethral sphincter

    surrounds urethra, provides voluntary control of urination, surrounds vagina

  • deep transverse perineal muscle

    supports genitourinary organs

  • external anal sphincter

    surrounds terminal part of anal canal , attaches to perineal body, provides voluntary control of defection

  • superficial transverse perineal muscles

    stabilize perineal body

  • bulbospongiosus and ischiocavernosus muscles

    aid with erection of external genitalia , helps expel semen from urethra

  • serratus anterior muscle

    powerful protractor of scapula, "boxers muscle", needed to punch, rotates scapula superiorly

  • pectoralis minor muscle

    assists with scapular protraction, depresses scapula

  • origin and insertion of serratus anterior and pectoralis minor

    can switch , both can elevate rib cage to act as accessory muscles of inspiration