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Lecture 15 > Facial Expression muscle > Flashcards

Facial Expression muscle Flashcards

1
Q

What are facial muscles?

A

muscles located in the subcutaneous tissue of the face which insert into the skin

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2
Q

What arch do the facial muscles develop from?

A

Second pharyngeal arch

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3
Q

What are the three groups of the Facial muscles?

A

Orbital
Nasal
Oral

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4
Q

What are orbital Muscles?

A

Two muscles which are in relation to the eye socket which control the eyelids, protecting the cornea

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5
Q

What are the two Orbital muscles?

A

Orbicularis Oculi
Corrugator Supercilii

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6
Q

What is the Orbicularis Oculi muscle?

A

Muscle that surrounds eye socket and extends into eye lids with three distinct parts, lacrimal, palpebral and orbital

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7
Q

What is the origin points of the Orbicularis Oculi muscle?

A

Lacrimal Part: Lacrimal Bone
Orbital Part: Medial Orbital Margin
Palpebral Part: Medial Palpebral Ligament

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8
Q

What is the insertion of the parts of the Orbicularis Oculi muscle?

A

Skin around the orbit along with tarsal plates of eyelids

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9
Q

What is the function of the Orbicularis Oculi muscle?

A

Lacrimal Part: Involved in drainage of tears
Palpebral Part: Gently closes eyelids
Orbital Part: Tightly closes eyelids

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10
Q

What is the Corrugator Supercilii muscle?

A

Much smaller muscle located posteriorly to the Orbicularis Oculi muscle

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11
Q

What is the origin of the Corrugator Supercilii muscle?

A

Superciliary arch

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12
Q

What is the insertion of the Corrugator Supercilii muscle?

A

Inserts into the skin of the eyebrows

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13
Q

What is the action of the Corrugator Supercilii muscle?

A

Pulls the eye brows together forming vertical wrinkles

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14
Q

What is the clinical relevance of the Orbital muscles paralysis?

A

The eye cannot shut causing the cornea to dry out in a process known as exposure keratitis.

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15
Q

What is the Nasal muscle group?

A

Muscles associated with moving the nose and skin surrounding it

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16
Q

How many muscles are in the Nasal muscle group?

A

Three, namely;

Nasalis
Procerus
Depressor Septi Nasi

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17
Q

What is the Nasalis muscle?

A

largest of the nasal muscles which is comprised of two parts; the transverse and alar

18
Q

What is the origin of the nasalis muscle?

A

Transverse Part: Originates from Maxilla, lateral to nose
Alar Part: Maxilla, overlaying lateral incisor

19
Q

What is the insertion of the nasalis muscle?

A

Transverse part: aponeurosis across the dorsum of the nose
Alar Part: alar cartilage of the nasal skeleton

20
Q

What is the action of the nasalis muscle?

A

Transverse part: Compresses nasal opening
Alar part: Widens nasal opening

21
Q

What is the Procerus muscle?

A

Most superior nasal muscle which lies superficial to the facial muscles

22
Q

What is the origin of the Procerus muscle?

A

Nasal bone

23
Q

What is the insertion of the Procerus muscle?

A

Skin of lower medial forehead

23
Q

What is the action of the Procerus muscle?

A

Pulls eyebrows downwards to produce Transverse wrinkles all over the nose

24
Q

What is the origin of the Depressor Septi Nasi?

A

Maxilla, above medial incisor tooth

25
Q

Where does the Depressor Septi Nasi insert?

A

Nasal Septum

26
Q

What is the action of the Depressor Septi Nasi?

A

Pulls nasal septum inferiorly to widen nasal opening

27
Q

What is the Oral Group of fascial muscle?

A

Muscles responsible for movements of the mouth and lips

28
Q

What are the Oral group?

A

They consists of :

Orbicularis Oris
Buccinator
Minor Oral Muscles

29
Q

What is the Orbicularis Oris muscle?

A

Main sphincter muscle of the lips

30
Q

What is the origin of the Orbicularis Oris muscle?

A

Maxilla and other muscles of the cheek

31
Q

What is the insertion of the Orbicularis Oris muscle>

A

Skin and mucous membrane of the lips

32
Q

What is the action of the Orbicularis Oris muscle?

A

Close lips to narrow the oral opening

33
Q
A
34
Q

What is the Buccinator?

A

A thin, square shaped muscle

35
Q

What is the origin of the Buccinator

A

Maxilla and Mandible

36
Q

What is the insertion of the Buccinator?

A

Into the skin along with the orbicularis oris

37
Q

What is the action of the Buccinator?

A

Pulls cheeks inwards against teeth, preventing accumulation of food

38
Q

What are the minor oral groups?

A

Group of minor muscles that act upon the lips and the mouth

39
Q

What is the lower group of the Minor Oral muscles?

A

Depressor Anguli Oris, Depressor Labii Inferioris, Mentalis

40
Q

What is the Upper group of the Minor Oral muscles?

A

Risorius, Zygomaticus Major, Zygomaticus Minor, Levator Labii superioris, levator labii superioris alaeque nasi and levator anguli oris

Lecture 15 (5 decks)

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