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Muscles of the Thorax and Back

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imissyou419's version from 2016-12-13 22:42

Section 1

Question Answer
True ribsribs 1-7, attach to their own costal cartilage and then to sternum
False ribsribs 8-10, piggyback onto costal cartilage of 7 and then to sternum
Floating ribs11-12, no articulate
tubercles articulate withtransverse process of vertebrae of the same number, head of rib articulate with the facets of the same number + the number above it
compare thoracic joint with skull jointthoracic joint is movable - tough joint capsule, joint cavities is sac, ligament attach head to disc), skull joint is immovable
costotransverse ligament, lateral costotransverse ligament, superior costotransverse ligamentrun from neck of rib to transverse process, run from rib to transverse process, run from rib to transverse process of rib above; these all hold ribs in place
what are the 3 parts of the sternum and how do they develop?manubrium, body of sternum, xiphoid process; develop from different centres of ossification, fuse together
sternal anglebetween manubrium and body of sternum
External intercostals origin, insertion, and actionorigin: inferior border of rib above, insertion: superior border of rib below, muscles run inferiorly and anteriorly "hands in vest"; elevates rib cage (respiration)
what is external intercostal membrane?aponeurosis of external intercostal muscle as it approach sternum
Internal & innermost intercostal origin, insertion, and actionorigin: superior border of rib below, insertion: inferior border of rib above, muscles run inferiorly and posteriorly; depresses rib cage (expiration)
what are the structures run in costal groove?VAN - nerve, artery, vein that provide blood and innervation to ribs
internal intercostals and external intercostals are at ___ angles with each otherright; support eachother
Lungs are stuck inside the rib cage because layers of pleura and lungs, whenever rib cage expands, lungs expand
internal intercostal membraneinterntal intercostal becomes aponeurotic as it appoaches vertebral column
diaphgrammuscular sheet that forms division between thoracic cavity and abdominal cavity, is the most important muscle for respiration
diaphgram contraction & relaxationfibers from costal margin insert into central tendon of diaphgram, adds strength; when contracted, diaphgram fibers pull to form contracted muscular sheath which increase dimensions of thoracic cage; when diagram relaxes, forms dome
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Section 2

Question Answer
intrinisic musclesattach to bones of axial skeleton and move the back
splenius cervicus origin & insertionorigin: nuchal ligament of cervical spinous process, insertion: transverse process of C1; move neck region
splenius capitis origin & insertionorigin:nuchal ligament of spinous process, insertion: mastoid process; moves head
splenius unilateral and bilateral actionsunilateral: lateral flex and rotate head to side of active muscle, bilateral: extend head and neck
sternocleidomastoid muscleorigin: cleido, sterno (sternum); insertion: mastoid process
sternocleidomastoid muscle unilateral and bilateral actionsunilateral: rotate head toward opposite shoulder, lateral flex head to same side; bilateral action: flexes neck
spinalis, longissimus, iliocostalis functionbilateral: extension of vertebral column, unilateral - bend to same side
intertransversariusunilateral - lateral flexion towards that side; bilaterally: extends vertebral column and head
rotatoresunilateral: turns to opposite side, bilateral: extends vertebral column and head
multifidusunilateral: turns to opposite side, bilateral: extends vertebral column and head
interspinalesextends vertebral column and head (there is only 1 set that run from spinous process to spinous process)
semispinalis origin and insertion and actionorigin: transverse process of C7-T12; insertion: occipital bone and spinous process of T1-T4; bilateral: extends v.c and head, unilateral: rotate to opposite side
intrinisic muscles of the back are innervated bydorsal rami
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