origins,insertions,actions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| temporalis | lateral surface of temporal bone | mandible (coronoid process and ramus) | closes jaw and retracts jaw
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| masseter | zygomatic arch | mandible (lateral surface of ramus) | closes jaw and assists protraction-Unilaterally: lateral jaw motion to same side
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| orbicularis oris | maxilla, mandible, lips, buccinator | mucous membranes, muscles inserting into lip | lip closure
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| buccinator | maxilla, mandible | lips | maintains cheeks tension near teeth (thereby food in position for chewing)
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| medial pterygoid | pterygoid plate (medial surface) | mandible (medial surface of ramus) | closes jaw and assists protraction - Unilaterally: lateral jaw motion to opposite side
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| lateral pterygoid | pterygoid plate (lateral surface) | mandible, temporomandibular joint capsule | protracts jaw
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| mylohyoids-suprahyoid | (blank) | (blank) | raises hyoid bone in swallowing (when mandible is stable or opens the jaw (when hyoid bone is stable)
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| digastrics (anterior and posterior bellies)-suprahyoid | (blank) | (blank) | raises hyoid bone in swallowing (when mandible is stable) or opens the jaw (when hyoid bone is stable)
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| geniohyoids-suprahyoid | (blank) | (blank) | raises hyoid bone in swallowing (when mandible is stable) or opens the jaw (when hyoid bone is stable)
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| thyrohyoid - infrahyoid | (blank) | (blank) | stabilizes hyoid bone in swallowing by pulling it downward
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| sternothyroid-infrahyoid | (blank) | (blank) | stabilizes hyoid bone in swallowing by pulling it downward
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| sternohyoid-infrahyoid | (blank) | (blank) | stabilizes hyoid bone in swallowing by pulling it downward
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| omohyoid-infrahyoids | (blank) | (blank) | stabilizes hyoid bone in swallowing by pulling it downward
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| sternocleidomastoid | sternal head-manibruium of sternum: clavicular head-medial clavicle | mastoid process of temporal bone | bilaterally - flexion of neck: unilaterally-lateral flexion of neck to same side, rotation of head to opposite side
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| scalenus anterior | transverse processes of cervical vertebrae C3-6 | to 1st rib | bilaterally-raise first 2 ribs during forced inspiration or assist neck flexion: Unilaterally-assists in lateral flexion of head to same side
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| scalenus medius | transverse processes of cervical vertebrae C2-7 | to 1st rib | bilaterally-raise first 2 ribs during forced inspiration or assist neck flexion: Unilaterally-assists in lateral flexion of head to same side
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| scalenus posterior | transverse processes of cervical vertebrae C4-6 | to 2nd rib | bilaterally-raise first 2 ribs during forced inspiration or assist neck flexion: Unilaterally-assists in lateral flexion fo hed to same side
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| splenius capitis | ligamentum nucha; spinous processes of C7, T1-3 | mastoid process of temporal bone; occipital bone | bilaterally- extension of neck; Unilaterally-lateral flexion and rotation of head to same side
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| splenius cervicis | upper thoracic vertebrae T3-6 | upper cervical vertebrae (transverse processes of C1,2,3 | bilaterally- extension of neck; Unilaterally-lateral flexion and rotation of head to same side
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