PCSD 313 Module IV Articulation and Resonance - Exam #3 Study
guide Questions with Correct Answers (Grade A+)
Question 1: 1. Muscles of the Tongue 2. Muscles of the Velopharyngeal Mechanism 3. Muscles of
Mastication 4. Muscles of Facial Expression
Answer: There are 4 groups of articulatory muscles:
Question 2: 1. Orbicularis Oris 2. Transverse Muscles: BR 3. Angular Muscles: ZLD 4. Vertical
Muscles: LDM 5. Other: FONP
Answer: Muscles of Facial Expression
Question 3: Primary muscle of the lips; will close mouth and pucker lips; a sphincter muscle.
Function - A. When active, it closes the mouth & puckers the lips. B. When activated with other
muscles, it will close the mouth in a straight line.
Answer: Orbicularis Oris OO
Question 4: primary muscle of the cheek, trumpeter muscle. deepest of the facial muscles. Origin: on
the pterygomandibular ligament (hamulus to the last molar). Course: horizontally & anteriorly.
Insert: its fibers decussate [cross] at the corners of the oral cavity to insert into OO. Function: Draws
the corners of the mouth laterally.
Answer: Transverse Muscle: Buccinator
Question 5: Origin: Fascia covering masseter Course: Horizontally & anteriorly. Parallel &
superficial to buccinator. Insert: Skin & mucosa at corners of oral cavity [OO] Function: Assists in
drawing corners of mouth laterally.
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, Answer: Transverse Muscle: Risorius
Question 6: Origin: Surface of Zygomatic bone Course: Inferiorly & medially Insert: OO and skin at
corner of oral cavity. Function: Draws corners of mouth superiorly & laterally to form a broad
smile.
Answer: Angular Muscle: Zygomatic Major
Question 7: Origin: Lower margin of the orbit of the eye. Course: Inferiorly Insert: Upper lip, lateral
to levator anguli oris Function: Pulls up the upper lip; Elvis look
Answer: Angular Muscle: Levator Labii Superior
Question 8: Origin: Mandible, just lateral to midline Course: Superiorly and medially Insert: Lower
lip Function: Draws lower lip down inferiorly and laterally.
Answer: Angular Muscle: Depressor Labii Inferior
Question 9: Origin: lateral to the nasal ala Course: Inferiorly Insert: Into OO with some fibers
decussating to the lower lip Function: Draws corners of the oral cavity superiorly & aids in closing
the lower lip.
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, Answer: Vertical Muscle: Levator Anguli Oris
Question 10: Origin: Mandible, slightly lateral to midline Course: Superior Insertion: OO with some
fibers crossing to upper lip Function: Depresses the angle of the lip and draw the upper lip down,
exposes lower teeth.
Answer: Vertical: Depressor Anguli Oris
Question 11: Origin: Mental tuberosity of the mandible Course: Superior Insertion: Some fibers
insert into the chin, some into OO Function: Contraction will evert the lower lip, wrinkle the chin,
and stiffen the lower lip so that the mouth can be closed in a line. Frowning muscle.
Answer: Vertical Muscle: Mentalis
Question 12: thin, quadrilateral muscle. • O: Galea Aponeurotica (Dense layer of fibrous tissue that
covers the upper part of the cranium) • C: Inferiorly. • I: Subcutaneous tissue of the eyebrows. • F:
Elevates eyebrows in glancing upward. Expressions of surprise/fright. Wrinkles forehead.
Answer: Frontalis
Question 13: Ring-like band of muscle that surrounds the eye. It is a sphincter muscle. • O: Frontal
& Maxillary bone. • C: Completely encircles the eyes. • I: Skin of the eyelids (upper & lower). • F:
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guide Questions with Correct Answers (Grade A+)
Question 1: 1. Muscles of the Tongue 2. Muscles of the Velopharyngeal Mechanism 3. Muscles of
Mastication 4. Muscles of Facial Expression
Answer: There are 4 groups of articulatory muscles:
Question 2: 1. Orbicularis Oris 2. Transverse Muscles: BR 3. Angular Muscles: ZLD 4. Vertical
Muscles: LDM 5. Other: FONP
Answer: Muscles of Facial Expression
Question 3: Primary muscle of the lips; will close mouth and pucker lips; a sphincter muscle.
Function - A. When active, it closes the mouth & puckers the lips. B. When activated with other
muscles, it will close the mouth in a straight line.
Answer: Orbicularis Oris OO
Question 4: primary muscle of the cheek, trumpeter muscle. deepest of the facial muscles. Origin: on
the pterygomandibular ligament (hamulus to the last molar). Course: horizontally & anteriorly.
Insert: its fibers decussate [cross] at the corners of the oral cavity to insert into OO. Function: Draws
the corners of the mouth laterally.
Answer: Transverse Muscle: Buccinator
Question 5: Origin: Fascia covering masseter Course: Horizontally & anteriorly. Parallel &
superficial to buccinator. Insert: Skin & mucosa at corners of oral cavity [OO] Function: Assists in
drawing corners of mouth laterally.
Page 1
, Answer: Transverse Muscle: Risorius
Question 6: Origin: Surface of Zygomatic bone Course: Inferiorly & medially Insert: OO and skin at
corner of oral cavity. Function: Draws corners of mouth superiorly & laterally to form a broad
smile.
Answer: Angular Muscle: Zygomatic Major
Question 7: Origin: Lower margin of the orbit of the eye. Course: Inferiorly Insert: Upper lip, lateral
to levator anguli oris Function: Pulls up the upper lip; Elvis look
Answer: Angular Muscle: Levator Labii Superior
Question 8: Origin: Mandible, just lateral to midline Course: Superiorly and medially Insert: Lower
lip Function: Draws lower lip down inferiorly and laterally.
Answer: Angular Muscle: Depressor Labii Inferior
Question 9: Origin: lateral to the nasal ala Course: Inferiorly Insert: Into OO with some fibers
decussating to the lower lip Function: Draws corners of the oral cavity superiorly & aids in closing
the lower lip.
Page 2
, Answer: Vertical Muscle: Levator Anguli Oris
Question 10: Origin: Mandible, slightly lateral to midline Course: Superior Insertion: OO with some
fibers crossing to upper lip Function: Depresses the angle of the lip and draw the upper lip down,
exposes lower teeth.
Answer: Vertical: Depressor Anguli Oris
Question 11: Origin: Mental tuberosity of the mandible Course: Superior Insertion: Some fibers
insert into the chin, some into OO Function: Contraction will evert the lower lip, wrinkle the chin,
and stiffen the lower lip so that the mouth can be closed in a line. Frowning muscle.
Answer: Vertical Muscle: Mentalis
Question 12: thin, quadrilateral muscle. • O: Galea Aponeurotica (Dense layer of fibrous tissue that
covers the upper part of the cranium) • C: Inferiorly. • I: Subcutaneous tissue of the eyebrows. • F:
Elevates eyebrows in glancing upward. Expressions of surprise/fright. Wrinkles forehead.
Answer: Frontalis
Question 13: Ring-like band of muscle that surrounds the eye. It is a sphincter muscle. • O: Frontal
& Maxillary bone. • C: Completely encircles the eyes. • I: Skin of the eyelids (upper & lower). • F:
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