Anatomy 231 Neck Muscles: Origin Insertion and action.

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mahp
ID:
286310
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Anatomy 231 Neck Muscles: Origin Insertion and action.
Updated:
2014-11-16 16:52:07
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Anatomy Neck Muscles
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Description:
Origin, insertion and action of neck muscles
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  1. Digastric
    • Origin= Lower margin of mandible and mastoid process of temporal bone
    • Insertion= By a connective tissue loop to hyoid bone.
    • Action= Open mouth and depresses mandible; digestric muscles elevate hyoid bone and steady it during swallowing and speech.
  2. Stylohyoid (skip)
    • origin= Styoloid process of temporal bone
    • Insertion= Hyoid bone.
    • Action= Elevates and retracts hyoid (elongates floor of mouth during swallowing.
  3. Sternohyoid
    • Origin= Manubrium and medial end of clavicle.
    • insertion= lower margin of hyoid bone
    • Action= Depresses larynx and hyoid bone if mandible is fixed.
  4. Thyrohyoid
    • Origin= Thyroid cartilage.
    • Insertion= hyoid bone.
    • Action= Depresses hyoid bone or elevates larynx if hyoid is fixed.
  5. Splenius capitis and cervicis. (skip)
    • Origin= ligamentun nuchae. Spinous process of vertebrae C7-T6.
    • Insertion= Mastoid process of temporal bone and occipital bone (capitis). Transverse processes of C2-C4 vertebrae (cervicis).
    • Action= Extend the head. When splenius are activated head is rotated and bent laterally toward same side.
  6. Spinalis thoracis and cervicis (skip)
    • Origin= Spines of upper lumbar and lower thoracic vertebraeĀ 
    • Insertion= Spines of upper thoracic and cervical vertebrae.
    • Action= Extends vertebral column.
  7. Semispinalis thoracis, cervicis and capitis
    • Origin= Transverse processes of C7- T12.
    • Insertion= Occipital bone (Capitis)
    • Insertion= Spinous processes of cervical (cervicis).
    • Insertion= Thoracic vertebra T1-T4 (thoracis).
    • Action= Extends vertebral column and head and rotates the opposite side; acts synergistically with sternocleidomastoid of opposite side.

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