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Skull muscles

Muscles of the skull and neck

QuestionAnswer
Orbicularis oculi ORIGIN - surrounds palpebral fissure (eyelid) ACTION - close palpebral fissue (eyelid)
Platysma ORIGIN - dorsal tendinous raphe of neck and skin INSERTION - commissure of lips ACTION - draw commissure of lips caudally (for panting) FORM - strap POSITION - superficial
Buccinator ORIGIN - dorsal maxilla, ventral mandible INSERTION - raphe of commissure of lips ACTION - return food from vestibule to teeth FORM - flat wide
Temporalis ORIGIN - temporal fossa INSERTION - coronoid process of mandible ACTION - raise mandible/close mouth POSITION - largest m. of head
Masseter ORIGIN - zygomatic arch ACTION - raise mandible/close mouth POSITION - lateral surface ramus of mandible, ventral to zygomatic arch Strongest muscle of mastication
Pterygoid ORIGIN - sphenoid bone INSERTION - medial surface condyle of mandible ACTION - raise mandible/close mouth POSITION - deep to zygomatic arch
Digastricus ORIGIN - paracondylar process of occipital bone INSERTION - ventral border of mandible ACTION - open the mouth
Styloglossus - extrinsic muscle tongue ORIGIN - stylohyoid bone INSERTION - base of tongue ACTION - draw tongue caudally
Hyoglossus - extrinsic muscle tongue ORIGIN - ventrolateral basihyoid INSERTION - root and caudal tongue ACTION - retract and depress tongue
Genioglossus - extrinsic muscle tongue ORIGIN - medial surface mandible INSERTION - apex of tongue ACTION - depress tongue, draw tongue rostral
Mylohyoideus ORIGIN - medial side of mandible INSERTION - median fibrous raphe ACTION - raise floor of mouth, draw hyoid rostral POSITION - most ventral in intermandibular space
Geniohyoideus ORIGIN - intermandiublar articulation INSERTION - rostral border of hyoid ACTION - draw hyoid rostral
Sternohyoideus ORIGIN - dorsal manubrium sterni and 1st costal cartilage INSERTION - hyoid bone ACTION - draw hyoid caudally FORM - strap POSITION - superficial m.
Sternothyroideus ORIGIN - 1st costal cartilage INSERTION - lateral thyroid lamina INSERTION - draw hyoid caudally
Longus capitus ORIGIN - transverse process C2-6 INSERTION - tubercles of occipital ACTION - flexion of atlano-occipital joint, draw neck ventral
Longus colli ORIGIN - transverse process (ventral side) of T6 (and all cranial to this) INSERTION - ventral surface of preceding vert, terminates at atlas ACTION - flex neck POSITION - lies on ventral surface of first 6 thoracic and all cervical vert
Created by: tazza261
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