Muscles of the Neck

					Muscles of the Neck
             By:
       Ashlyn Hooper
       Shelby Talbot
       Nick D’Accardi
       Olivia Reeves
        Suprahyoid Muscles
Muscles that help form floor of oral cavity,
 anchor tongue, elevate hyoid, and move
 larynx periosurly during swallowing; lie
 superior to hyoid bone
                  Digastric
• Description: consists   • Origin: lower margin
  of two bellies united     of mandible and
  by an intermediate        mastoid process of
  tendon, forming a V       the temporal bone.
  shape under the chin    • Insertion: by a
                            connective tissue loop
                            to a hyoid bone
                 Stylohyoid
• Description: slender   • Origin: styloid process
  muscle below angle       of the temporal bone
  jaw; parallels         • Insertion: hyoid bone
  posterior belly of
  diagstric muscle
                  Mylohyoid
• Description: flat,        • Origin: medial surface
  triangular muscle just      of mandiable
  deep to diagstric         • Insertion: hyoid bone
  muscle; this muscle         and median raphe
  pair forms a sling that
  forms the floor of the
  anterior mouth
                Geniohyoid
• Description: narrow      • Origin: inner surface
  muscle in contact with     of mandibular
  its partner medially;      symphysis
  runs from chin to        • Insertion: hyoid bone
  hyoid bone
         Infrahyoid Muscles
Straplike muscles that depress the hyoid
  bone and larnyx during swallowing and
  speaking
                Sternohyoid
• Description: most        • Origin: manubrium
  medial muscle of the       and medial end of
  neck; superficial          clavicle
  except the inferiorly,   • Insertion: lower
  where covered by           margin of hyoid bone
  strenocleidomastoid
               Sternothyroid
• Description: lateral   • Origin: posterior
  and deep to              surface of manubrium
  sternohyoid              of sternum
                         • Insertion: thyroid
                           cartilage
                  Omohyoid
• Description: straplike   • Origin: superior
  muscle with the two        surface of scapula
  bellies united by an     • Insertion: hyoid bone,
  intermediate tendon;       lower border
  lateral to sternohyoid
                Thyrohyoid
• Description: appears    • Origin: thyroid
  as a superior             cartilage
  continuation of         • Insertion: hyoid bone
  sternothryroid muscle
Pharyngeal constrictor muscles
• Description:             • Origin: attached
  composite of three         anteriorly to mandible
  paired muscles             and medial pterygoid
  whose fibers run           plate (superior), and
  circularly in pharynx      laryngeal cartilages
  wall; superior muscle      (inferior)
  is innermost and         • Insertion: posterior
  inferior one is            median raphe of
  outermost; substantial     pharynx
  overlap
Anterolateral Neck Muscles
           Sternocleidomastoid
• Description: two-headed       • Origin: manubriumn
  muscle located deep to          of sternum and
  platysma on anterolateral
                                  medial portion of
  surface of the neck;
  fleshy parts on either side     clavicle
  of neck delineate limits of   • Insertion: mastoid
  anteriorand posterior           process of temporal
  triangles; key muscular         bone and superiod
  landmark in neck;
  spasms of one of these
                                  nuchal line of occipital
  muscles may cause               bone
  torticollis
                Scalenes
• Description: located   • Origin: transverse
  more laterally than      processes of cervical
  anteriorly on neck;      vertebrae.
  deep to platysma and   • Insertion:
  sternocleidomastoid      anterolaterally on first
                           two ribs

				
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posted:3/8/2011
language:English
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