Download PPT#3.muscles of the head and neck

Muscles of the Head and Neck
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Origin: stationary point of attachment
Insertion: movable point of attachment
Action: Anatomical movement that results from
the contraction of the muscle
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Most muscles originate on the surface of the skull
and insert into the dermis
Create facial movements and
expressions
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Action: raises eyebrow, wrinkles forehead
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Action: tenses and retracts the scalp
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Action: closes mandible
 Ex: closes mouth during chewing
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Action: elevates mandible
 Ex: clenching your jaw, crushing food
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Action: closes eye
 Ex: blinking, squinting
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Action: compresses nostril
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Action: draws corner of mouth upward
 Ex: smiling
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Action: compresses cheeks
 Ex: playing a trumpet, whistling
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Action: compresses, purses lips
 Ex: kissing
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Action: depresses corner
of mouth
 Ex: frowning
frontalis
temporalis
Orbicularis oculi
zygomaticus
Orbicularis oris
masseter
buccinator
Depressor anguli
platysma
sternocleidomastoid
Epicranial aponeurosis
frontalis
occipitalis
temporalis
Orbicularis oculi
nasalis
zygomaticus
masseter
sternoclediomastoid
buccinator
Orbicularis oris
platysma
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Involved in
 Swallowing and chewing
 Moving your head and neck
 Supporting your head
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Anterior neck muscles work on the hyoid bone
 Suprahyoid muscles (above the hyoid) pull hyoid up
 Infrahyoid muscles (below the hyoid) pull hyoid down
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Extends from the clavicles and the sternum to the
mastoid region of the skull
Actions: flexion of head, lateral flexion, rotation of
head side to side
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Action: tenses skin of neck, depresses
mandible (opens mouth)
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Action: elevates hyoid bone when swallowing;
depresses the mandible (opening mouth)
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Broad/flat muscle provides muscular floor to
the mouth and helps press tongue to top of
mouth
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Connects the hyoid bone to the sternum
Action: depresses hyoid bone and larynx
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Anchors the larynx to the sternum
Action: depresses hyoid bone and larynx
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Connects the hyoid bone to the styloid
process of the skull
Action: elevates hyoid
digastric
mylohyoid
stylohyoid
thyrohyoid
omohyoid
sternohyoid
sternothyroid
Sternomastoid
Cleidomastoid
Sternohyoid
Mylohyoid
Digastric
Masseter
TOO DEEP TO DISSECT
Stylohyoid
Sternothyroid
Thyrohyoid
Digastric
Mylohyoid
Masseter
Sternohyoid
sternomastoid
cleidomastoid
Frontalis
Buccinator and
orbicularis oris
Orbicularis oculi
Platysma
Orbicularis oris
Depressor Anguli Oris