muscles Flashcards
what are the three abdominal muscles?
- rectus abdominis
- external oblique
- internal oblique
what are the three breathing muscles?
- diaphragm (not shown on cadaver)
- external intercostals
- internal intercostals (will be the cut)
what are the three erector spine muscles?
- iliocostalis
- longissimus
- spinalis
O.I.A. of rectus abdominis?
O. pubic symphysis
I. xiphoid process & costal cartilages
A. compresses abdomen and flexes vertebral column
O.I.A of external oblique?
O. outer surface of lower 8 ribs
I. linea alba
A. compresses the abdomen, flexes the vertebral column LATERALLY
O.I.A of internal oblique
O. iliac crest
I. linea alba
A. compresses the abdomen, flexes the vertebral column LATERALLY
O.I.A of diaphragm
O. bottom of rib cage, sternum, and lumbar vertebrae
I. central tendon
A. inspiration
O.I.A of external intercostals
O. inferior border of rib above
I. superior border of rib below
A. inspiration
O.I.A of internal intercostals
O. superior border of rib below
I. inferior border of rib above
A. forced expiration
O.I.A of iliocostalis
O. iliac crest
I. ribs
A. extend vertebral column
O.I.A of longissimus
O. transverse process of lumbar vertebrae
I. transverse process of thoracic vertebrae
A. extend vertebral column
O.I.A of spinalis
O. spinous processes of upper lumbar and lower thoracic vertebrae
I. spinous process of upper thoracic vertebrae
A. extend vertebral column
what groups of muscles action is all “extends the vertebral column?”
a. abdominal
b. breathing
c. erector spinae
c. erector spinae
hi, i originate from the bottom of the rib cage, sternum and lumbar vertebrae, insert of the central tendon, and my action is to inspirate… which muscle am i?
i am the diaphragm! fun fact: i cannot be shown on the cadaver so make sure to memorize my OIAs!
i am on the anterior side of the body and i insert on the pubic symphysis, insert on the xiphoid process and costal cartilages and i compress the abdomen and flex the vertebral column… who am i?
i am the rectus abdominis! body builder like to show me off with their 6-packs!
i originate on the inferior border of the rib above, insert on the superior border of the rib below and i aid in inspiration… who am i?
i am the external intercostals… please don’t confuse me with my twin the internal intercostals whose O and I’s are mine flipped
i am the most medial on the posterior side, and i can be seen on the spine, who am i?
i am the spinalis!
I am located on the posterior side but i am located most laterally, who am i?
i am the iliocostalis!
