External intercostals o inhalation elevation of ribs

This preview shows page 4 - 6 out of 8 pages.

External intercostals o Inhalation; elevation of ribs o 75% of the respiratory movements is done by diaphragm; 25% by external intercostal muscles - Internal intercostals o Depression of the ribs, particularly during forced exhalation o Innervaterd by intercostal nerves - Diaphragm o Originates from xiphoid process, costal cartilage and lumbar vertebrae o Attach to the central tendon o Inhalation (active): contraction of diaphragm, dome depresses, volume of chest increases & pressure decreases o Exhalation (passive) relaxing of muscles o Foramen for inferior vena cava (T8) o Formamen for esophagus (T10)
Image of page 4

Subscribe to view the full document.

o (T12) ~ respiratory muscles - Main (increase chest volume) o Diaphragm o External intercostal - Accessory (further expand chest volume) o Sternocleidomastoid elevating the clavicle and sternum o Abdomen (for exhalation) (muscle of abdomen) - External oblique o Arises from lower rinse and inserts in pelvis & linea alba o Aponeurosis o Putting hands in pocket o Inguinal ligament border between the abdomen and lower limb o Contralateral rotation - Internal oblique o Arises from the iliac crest o Inserts into linea alba o Ipsilateral rotation - (right external oblique works with left internal oblique) o Flexion o Lateral flexion o Rotation o Increasing abdominal pressure (coughing, child delivery etc..) o Valsalva maneuver sandwiching the spine between two pressures; contraction of abdominal muscles and closing of the larynx) - Transversus absominis o Inserts into the linea alba in the midline - Rectus abdominis o From pubis to costal cartilages of 5,6,7 o Main flexor of trunk - Innervated by the lower anterior intercostal nerves (T7-T12 & L1) ~ linea alba - Rectus sheet made by aponeurosis of rectus abdominis, internal oblique, external oblique and transverse abdominis ~ inguinal canal canal on the sides of the midline with inguinal rings - Provide passageway to testicles during embryonic development (pelvic muscles) - pelvic wall muscles o internal obturator o piriformis - pelvic diaphragm bowl shaped diaphragm (innervated by sacral plexus)
Image of page 5
o levator ani elevate anus (to drain contents of anal canal) o coccygeus o gap for structures to leave pelvis urethra anal canal vagina - perinium below to pelvic diaphragm o perineal muscles (all innervated by pudendal nerves – S2,3,4) o divided by two triangles of an imaginary line urogenital triangle urinary system & reproductive system bulbospongiosus drainage of last drops of urine in males; sphincter for vaginal opening in females ischiocavernosus erection of the penis anal triangle digestive system external anal sphincter (upper limb muscles) Scapula Rotator cuff muscles (tendons of these muscles insert into the greater/lesser tubercle of humerus) - supraspinatus GT o abduction of shoulder o helps to pull the tendons in the cavity - infraspinatus GT o lateral rotation - teres minor GT o lateral rotation - subscapularis lesser tubercle o medial rotation - tendon of muscles pass the humeral head and hold it against glenoid cavity o supports the shoulder joint
Image of page 6
You've reached the end of this preview.
  • Winter '15
  • Median nerve, Medial pterygoid muscle

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern