neck muscles.txt

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Author:
jtsterner
ID:
3010
Filename:
neck muscles.txt
Updated:
2009-12-15 18:59:39
Tags:
neck muscles
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Description:
Origin, Insertion, Innervation & Function
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  1. Stylohyoid
    O -Base of styloid process

    I -hyoid bone

    In -Facial nerve [VII]

    F -Elevates hyoid bone
  2. Digastric-Anterior belly
    O -Digastric fossa on lower inside of mandible

    I -Hyoid bone

    In - Mylohyoid nerve from inferior alveolar branch of mandibular nerve [V3]

    F -Elevates hyoid bone
  3. Digastric-Posterior belly
    O -Mastoid notch on medial side of mastoid process of temporal bone

    I -Hyoid bone

    In -Facial nerve [VII]

    F -Elevates hyoid bone
  4. Geniohyoid
    O -Inferior mental spine on inner surface of mandible

    I -Hyoid bone

    In -Branch from anterior ramus of C1 (carried along the hypoglossal nerve [XII])

    F -Elevates hyoid bone
  5. Mylohyoid
    O -Mylohyoid line on mandible

    I -Hyoid bone

    In -Mylohyoid nerve from inferior alveolar branch of mandibular nerve [V3]

    F - Elevates hyoid bone
  6. Sternohyoid
    O - Posterior aspect of sternoclavicular joint and adjacent manubrium of sternum

    I -Hyoid bone

    In -Anterior rami of C1 to C3 through the ansa cervicalis

    F -Depresses hyoid bone
  7. Omohyoid
    O -Superior border of scapula medial to suprascapular notch

    I -Hyoid bone

    In -Anterior rami of C1 to C3 through the ansa cervicalis

    F - Depresses hyoid bone
  8. Sternothyroid
    O - Posterior surface of manubrium of sternum

    I -Hyoid bone

    In -Anterior rami of C1 to C3 through the ansa cervicalis

    F -Depresses hyoid bone
  9. Thyrohyoid
    O -Oblique line on lamina of thyroid cartilage

    I -Hyoid bone

    In -Fibers from anterior ramus of C1 carried along hypoglossal nerve [XII]

    F -Depresses hyoid bone
  10. Sternocleidomastoid
    • Sternal head
    • O -Upper part of anterior surface of manubrium of sternum
    • I -Lateral one-half of superior nuchal line

    • Clavicular head
    • O -Superior surface of medial one-third of clavicle
    • I -Lateral surface of mastoid process

    • In -Accessory nerve [XI] & branches from anterior rami of C2-C4
    • F -Individually-will tilt head toward shoulder on same side rotating head to turn face to opposite side; acting together-draw head forward
  11. Suboccipital Region
    • Rectus capitis posterior major - extends head
    • Rectus capitis posterior minor - extends head
    • Obliquus capitis superior - extends head
    • Obliquus capitis inferior - rotates face to same side

    • In -posterior rami of C1
  12. Prevertebral (4 muscles)
    • Rectus capitis anterior
    • Rectus capitis lateralis
    • Longus colli
    • Longus capitis

    In -anterior rami of cervical nerves

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