Anterior Muscles of the Trunk and Neck

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Author:
msviolet_26
ID:
92290
Filename:
Anterior Muscles of the Trunk and Neck
Updated:
2011-06-30 14:36:35
Tags:
muscles trunk neck
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Description:
origin, insertion, nerve supply, action
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  1. Scalenus anterior
    • O: transverse processes of C3-C6
    • I: inner border of 1st rib
    • N: ventral rami C4,5,6
    • A: elevates 1st rib, flexes neck laterally; acting unilaterally, felse and rotates cervical spine to the opposite side.
  2. Scalenus Medius
    • O: transverse processes of C2-C7
    • I: superior surface of 1st rib
    • N: ventral rami C3,4,5,6,7,8
    • A: elevates 1st rib, flexes neck laterally
  3. Scalenus Posterior
    • O: transverse processes of C4-C6
    • I: superior surface of 2nd rib
    • N: ventral rami C6,7,8
    • A: elevates 2nd rib
  4. Sternocleidomastoid
    • O: sternal head - manubrium of sternum; clavicular head - medial end of clavicle
    • I: mastoid process
    • N: spinal accessory & C2, C3
    • A: bilateral: flexes neckunilateral: tilts head laterally, rotates face to opposite side
  5. Rectus Abdominis
    • O: pubic symphisis & pubic crest
    • I: xiphoid process, 5th to 7thcostal cartilage
    • N: ventral rami of inferior 6thoracic nerves
    • A: flexes trunk,compresses abdominal viscera
  6. External abdominal oblique
    • O: external surface inferiorborders of 5th to 12th ribs
    • I: anterior ½ iliac crest,linea alba,pubic tubercle
    • N: inferior 6 thoracic nerves& subcostal nerve
    • A: flexes and rotates trunk,compresses abdominal viscera
  7. Internal abdominal oblique
    • O: iliac crest,thoracolumbar fascia,inguinal ligament
    • I: inferior borders of ribs 10-12,linea alba,pubic bone
    • N: ventral rami of inferior sixthoracic & first lumbar nn.
    • A: flexes and rotates trunk,compresses abdominal viscera
  8. Transversus Abdominus
    • O: internal surfaces of 7th to12th costal cartilages,thoracolumbar fascia,iliac crest,inguinal ligament
    • I: linea alba,pubic crest
    • N: ventral rami of inferior sixthoracic & first lumbar nn.
    • A: compresses abdominal viscera

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