Myology related to complete denture
Assis.Prof.Dr.Radhwan Himmadi Hasan2017
11/6/2017
Assis.Prof.Dr.Radhwan H. Hasan
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Muscles of facial expression.
Muscles of mastication.Muscles of soft palate.
Muscles of tongue.
11/6/2017
Assis.Prof.Dr.Radhwan H. Hasan
2
Muscles of Facial Expression
Small muscles that insert into the dermis.Innervated by facial nerve (CN VII).
Paralysis causes face to sag.
Found in scalp, forehead, around the eyes, nose and mouth, and in the neck.
10-3
11/6/2017
Assis.Prof.Dr.Radhwan H. Hasan
Muscles of Facial Expression
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Assis.Prof.Dr.Radhwan H. Hasan4
Muscles of Facial Expression
11/6/2017Assis.Prof.Dr.Radhwan H. Hasan
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Muscles of Facial Expression
11/6/2017Assis.Prof.Dr.Radhwan H. Hasan
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Muscles around the Mouth
Orbicularis oris encircles mouth & other m. blend into it.
Levator & depressor of labii (lip) & anguli (angle of mouth).
Risorius & zygomaticus curl corner of mouth up in smile.
Buccinator keeps food on top of teeth, blowing & sucking.
Orbicularis oris
RisoriusDepressor labii inferioris
Buccinator
Zygomaticus major
Depressor anguli oris
Levator labii superioris
11/6/2017Assis.Prof.Dr.Radhwan H. Hasan
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Muscles of Facial Expression
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Assis.Prof.Dr.Radhwan H. Hasan
Muscles of Facial Expression and Mastication
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Assis.Prof.Dr.Radhwan H. Hasan9
Muscles of Mastication
Temporalis
Masseter
Lateral pterygoid
Medial pterygoid
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Assis.Prof.Dr.Radhwan H. Hasan10
Muscles acting on the Temporomandibular Joint
Movements of the temporomandibular joint are chiefly from the action of the muscles of mastication.
The temporalis, masseter, and medial pterygoid muscles produce biting movements.
The lateral pterygoid muscles protrude the mandible with the help from the medial pterygoid muscles and retruded largely by the posterior fibres of the temporalis muscle.
Gravity is sufficient to depress the mandible, but if there is resistance, the lateral pterygoid, suprahyoid and infrahyoid, mylohyoid and anterior digastric muscles are activated.
11/6/2017
Assis.Prof.Dr.Radhwan H. Hasan
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Musculature of the Tongue
Intrinsic muscles = vertical, transverse and longitudinalExtrinsic muscles connect tongue to hyoid, styloid process, palate and inside of chin
Tongue shifts food onto teeth and pushes it into pharynx
10-12
Intrinsic tongue muscles
Extrinsic tongue muscles
11/6/2017
Assis.Prof.Dr.Radhwan H. Hasan• Muscles of the Tongue:
• Intrinsic muscles: These comprise four paired groups, designated superior longitudinal, inferior longitudinal, transverse, and vertical. They all originate and insert in the tongue. The actions of these muscles are complex, but their effect is to change the shape of the tongue.
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Assis.Prof.Dr.Radhwan H. Hasan13
Extrinsic muscles: These four paired muscles control the position of the tongue.
Genioglossus-Hyoglossus-
Styloglossus-
Palatoglossus-
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Assis.Prof.Dr.Radhwan H. Hasan14
Muscles of soft palate
Palatopharyngeal m.
Palato glossus m.Azygos uvulae m.
Tensor palati m.
Levator palati m.
Palatopharyngeal m.
Palato glossus m.Azygos uvulae m.
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Assis.Prof.Dr.Radhwan H. Hasan
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Assis.Prof.Dr.Radhwan H. Hasan16