The muscles that promote facial expression lie just deep to the
skin.
Slide 4
Muscles of Facial Expression The muscles that promote facial
expression lie just deep to the skin. They are thin and variable
shape and are fused to other muscles.
Slide 5
Muscles of Facial Expression The muscles that promote facial
expression lie just deep to the skin. They are thin and variable
shape and are fused to other muscles. They are unusual in that they
insert on the skin and not the bone.
Slide 6
Muscles of Facial Expression These muscles are responsible for:
Lifting the eye brows Flaring of the nostrils Opening and closing
the mouth How important are these muscles for our nonverbal
communication? Muscles of Facial Expression
Slide 7
Examine the masked face of a person with Parkinsons Disease
where the facial muscles are no longer functioning.
Slide 8
Muscles of Facial Expression All the muscles described below
are innervated by the Facial Nerve (cranial Nerve VII)
Slide 9
Muscles of Facial Expression Epicranius consists of the frontal
and occipital bellies connected by the galena aponeurosis. The
frontal belly raises the eye brows wile the occipital belly pulls
the scalp posteriorly.
Slide 10
Muscles of Facial Expression
Slide 11
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 12
Muscles of Facial Expression Corrugator supercilii draws the
eyebrows together and inferiorly, better known as the frown.
Slide 13
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 14
Muscles of Facial Expression Obicularis oculi is a sphincter
muscle of the eyelid and is responsible for closing the eye,
squinting and blinking.
Slide 15
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 16
Muscles of Facial Expression Zygomaticus (major and minor) run
from the zygomatic bone to the skin and muscles at the corner of
the mouth. They are your smiling muscles.
Slide 17
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 18
Muscles of Facial Expression Risorius lies just below the
Zygomaticus and inserts on the skin at the angle of the mouth and
originates in the fascia along the Masseter muscle. It tenses your
lips.
Slide 19
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 20
Muscles of Facial Expression Levator labii superioris
originates on the zygomatic bone and margin of the maxilla and
inserts on the skin of the upper lip. It raises and furrows the
upper lip.
Slide 21
Muscles of Facial Expression Levator labii superioris
originates on the zygomatic bone and margin of the maxilla and
inserts on the skin of the upper lip. It raises and furrows the
upper lip. Depressor labii inferioris originates on the mandible
and inserts on the muscles and skin of the lower lip. It draws the
lip down (pouting)
Slide 22
Muscles of Facial Expression
Slide 23
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 24
Muscles of Facial Expression Orbicularis oris is primarily a
circular muscle and has a complicated origin in the fascia around
the mandible and maxilla. It inserts on the angles of the mouth. It
protrudes the lips as in whistling.
Slide 25
Muscles of Facial Expression
Slide 26
Mentalis is a V shaped muscle at the base of the chin. It helps
in protruding the lower lip.
Slide 27
Muscles of Facial Expression Mentalis is a V shaped muscle at
the base of the chin. It helps in protruding the lower lip.
Buccinator is a thin horizontal muscle and is the primary muscle of
the cheek. It inserts on the Obicularis oris and originates on the
maxilla and mandible. It compresses the cheek muscles.
Slide 28
Muscles of Facial Expression
Slide 29
Copyright 2010 Pearson Education, Inc. Figure 10.6 Lateral view
of muscles of the scalp, face, and neck. Corrugator supercilii
Orbicularis oculi Levator labii superioris Zygomaticus minor and
major Buccinator Risorius Orbicularis oris Mentalis Depressor labii
inferioris Depressor anguli oris Platysma Galea aponeurotica
Frontal belly Occipital belly Temporalis Masseter
Sternocleidomastoid Trapezius Splenius capitis Epicranius
Slide 30
Muscles of Facial Expression Platysma is a thin sheet like neck
muscle that tenses the skin of the neck. It originates on the
fascia of the chest and inserts on the lower margin of mandible and
skin.
Slide 31
Muscles of Facial Expression
Slide 32
Slide 33
Muscles of Mastication & Tongue Movement Four pairs of
muscles are involved in mastication. All are innervated by the
cranial nerve V.
Slide 34
Muscles of Mastication & Tongue Movement Four pairs of
muscles are involved in mastication. All are innervated by the
cranial nerve V. The Masseter and Temporalis muscles are prime
movers for clenching the jaw. The Pterygoid muscles provide the
grinding action.
Slide 35
Muscles of Mastication & Tongue Movement Four pairs of
muscles are involved in mastication. All are innervated by the
cranial nerve V. The Masseter and Temporalis muscles are prime
movers for clenching the jaw. The Pterygoid muscles provide the
grinding action. The Tongue composed of intrinsic muscles which
provide its range of motion. Extrinsic muscles all innervated by
the hypoglossal (cranial nerve XII), move and anchor the
tongue.
Slide 36
Muscles of Mastication & Tongue Movement The Masseter
covers the lateral part of the mandibular ramus. It originates on
the zygomatic bone and inserts on the angle of the ramus of the
mandible. It elevates the jaw.
Slide 37
Muscles of Mastication & Tongue Movement The Masseter
covers the lateral part of the mandibular ramus. It originates on
the zygomatic bone and inserts on the angle of the ramus of the
mandible. It closes the jaw. The Temporalis is a large fan shaped
muscle that covers the temporal and parietal lobes. It inserts on
the coronoid process of the mandible. It closes the jaw.
Muscles of Mastication & Tongue Movement The Medial
Pterygoid muscles originate on the pterygoid process of the
sphenoid bone and insert on the medial surface mandible. It
promotes side to side movement of the jaw. The Lateral Pterygoid
muscles originate on the pterygoid process of the sphenoid bone and
insert on the condyle of the mandible. It promotes side to side
movement of the jaw.
Muscles of Mastication & Tongue Movement The Genioglossus
is an extrinsic muscle of the tongue and forms the bulk of the
inferior part of the tongue. Its origin is on the internal surface
of the mandible and it inserts on the inferior part of the tongue
and hyoid bone.
Slide 43
Muscles of Mastication & Tongue Movement The Genioglossus
is an extrinsic muscle of the tongue and forms the bulk of the
inferior part of the tongue. Its origin is on the internal surface
of the mandible and it inserts on the inferior part of the tongue
and hyoid bone. It protracts (stick out) the tongue.
Slide 44
Muscles of Mastication & Tongue Movement
Slide 45
Tongue Styloid process Styloglossus Hyoglossus Stylohyoid Hyoid
bone Thyrohyoid Genioglossus Mandibular symphysis Geniohyoid
Thyroid cartilage (c) Figure 10.7c Muscles promoting mastication
and tongue movements.
Slide 46
Muscles of Mastication & Tongue Movement The Hyoglossus is
an extrinsic muscle of the tongue. Its origin is on the hyoid bone
and it inserts on the inferior lateral part of the tongue. It
depresses the tongue.
Slide 47
Muscles of Mastication & Tongue Movement The Hyoglossus is
an extrinsic muscle of the tongue. Its origin is on the hyoid bone
and it inserts on the inferior lateral part of the tongue. It
depresses the tongue. The Styloglossus is an extrinsic muscle that
runs superiorly and at a right angle to the Hyoglossus. It retracts
(pulls in) the tongue. (Opposite of what muscle?)
Slide 48
Tongue Styloid process Styloglossus Hyoglossus Stylohyoid Hyoid
bone Thyrohyoid Genioglossus Mandibular symphysis Geniohyoid
Thyroid cartilage (c) Figure 10.7c Muscles promoting mastication
and tongue movements.