Gross Anatomy

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Author:
Anonymous
ID:
87973
Filename:
Gross Anatomy
Updated:
2011-05-26 23:48:20
Tags:
Muscles
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Description:
Exam 1
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  1. trapezius
    • origin: superior nuchal line, external occipital
    • protuberance, ligamentum nuchae, spinous processes of C7 to T12
    • insertion: lateral one-third of clavicle, acromion,
    • spine of scapula
    • innervation: motor – accessory nerve XI; proprioception C3 and C4
    • function: assists in rotating the scapula during abduction of humerus above horizontal; upper fibers elevate, middle fibers adduct, and lower fibers depress scapula
  2. latissimus dorsi
    • origin: spinous processes of T7 to L5 and sacrum, iliac crest, ribs 10-12
    • insertion: floor of intertubercular sulcus of humerus
    • innervation: thoracodorsal nerve (C6 to C8)
    • function: extends, adducts, and medially rotates humerus
  3. levator scapulae
    • origin: transverse processes of C1 to C4
    • insertion: upper portion medial border of scapula
    • innervation: C3 to C4 and dorsal scapular nerve (C4, C5)
    • function: elevates scapula
  4. rhomboid major
    • origin: spinous processes of T2 to T5
    • insertion: medial border of scapula between spine and inferior angle
    • innervation: dorsal scapular nerve (C4, C5)
    • function: retracts (adducts) and elevates scapula
  5. rhomboid minor
    • origin: lower portion of ligamentum nuchae, spinous processes of C7 to T1
    • insertion: medial border of scapula at the spine of
    • scapula
    • innervation: dorsal scapular nerve (C4, C5)
    • function: retracts (adducts) and elevates scapula
  6. serratus posterior superior
    • origin: lower portion of ligamentum nuchae, spinous processes of C7 to T3 and supraspinous ligaments
    • insertion: upper border of ribs 2 to 5 just lateral to
    • their angles
    • innervation: anterior rami of upper thoracic nerves (T2 to T5)
    • function: elevates ribs 2 to 5
  7. serratus posterior inferior
    • origin: spinous processes of T11 to L3 and supraspinous ligaments
    • insertion: lower border of ribs 9 to 12 just lateral to
    • their angles
    • innervation: anterior rami of lower thoracic nerves (T9 to T12)
    • function: depresses ribs 9 to 12 and may prevent lower ribs from being elevated when the diaphragm contracts
  8. splenius capitis
    • origin: lower half of ligamentum nuchae, spinous processes of C7 to T4
    • insertion: mastoid process, skull below lateral
    • one-third of superior nuchal line
    • innervation: posterior rami middle cervical nerves
    • function: together – draw head backward, extending neck; individually – draw and rotate head to one side (turn face to same side)
  9. splenius cervicis
    • origin: spinous processes of T3 to T5
    • insertion: transverse processes of C1 to C3
    • innervation: posterior rami lower cervical nerves
    • function: together – extend neck; individually – draw and rotate head to one side (turn face to same side)
  10. rectus capitis posterior
    • origin: spinous process of axis (C2)
    • insertion: lateral portion of occipital bone below
    • inferior nuchal line
    • innervation: posterior ramus of C1
    • function: extension of head; rotation of face to same side as muscle
  11. rectus capitis posterior minor
    • origin: posterior tubercule of atlas
    • insertion: medial portion of occipital bone below inferior nuchal line
    • innervation: posterior ramus of C1
    • function: extension of head
  12. obliquus capitis superior
    • origin: transverse process of atlas (C1)
    • insertion: occipital bone between superior and inferior nuchal lines
    • innervation: posterior ramus of C1
    • function: extension of head and bends it to same side
  13. obliquus capitis inferior
    • origin: spinous process of axis (C2)
    • insertion: transverse process of atlas (C1)
    • innervation: posterior ramus of C1
    • function: rotation of face to same side
  14. iliocostalis
  15. spinalis
  16. longissimus
  17. semispinalis
  18. rotatores
  19. multifidius

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