Chapter 5 & 7 Flashcards

Muscles of facial expression

1
Q

Orbicularis oris muscle location?

A

Surrounds mouth Action: Closes, compresses, and puckers lips

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2
Q

Risorius muscle?

A

Action: Pulls corner of the mouth laterally

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3
Q

Zygomaticus major muscle?

A

Origin: Zygomatic bone Insertion: Corner of the mouth Action: Elevates corner of the mouth

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4
Q

Which two muscles work together to raise the upper lip?

A

Levator labii superioris muscle (Medially) Zygomaticus minor muscle

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5
Q

Depressor anguli oris muscle?

A

–Origin: Lower border of the mandible

–Insertion: Corner of the mouth

–Action: Pulls corner downward (i.e. “sad face”)

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6
Q

Depressor labii inferioris muscle?

A

–Origin: Lower border of the mandible

–Insertion: Medial to the corner of the mouth

–Action: Pulls down on lower lip

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7
Q

Platysma Muscle?

A

Actually a neck muscle

–Origin: Fascia of the pectoralis & deltoid muscle

–Insertion: Corner of the mouth

–Action: Pulls down on the mouth (causes skin of neck to “wrinkle” during movement)

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8
Q

Mentallis Muscle?

A

–Origin: Mandible below lateral incisors

–Insertion: Skin of the chin

–Action: Pushes up the lower lip and wrinkles skin of the chin

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9
Q

Buccinator Muscle?

A

Also assists with mastication

–Origin: Pterygomandibular raphe

–Insertion: Mandible and maxilla

–Action: Tightens cheek wall; assists in chewing by keeping food in the mouth

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10
Q

Orbicularis oculi muscle?

Two portions?

A

–Two portions: orbital & palpebral

–Totally encircles eye

–Palpebral portion: found in eyelids

–Orbital portion: portion surrounding the eye

–Action: Closes the eyelids

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11
Q

Corrugator supercilii muscle?

A

–Origin: Superciliary ridge

–Insertion: Bridge of nose

–Action: Pulls eyebrows medially; vertical wrinkles between eyebrows

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12
Q

Procerus muscle?

A

–Origin: Nose

–Insertion: Skin medial to eyebrow

–Action: Moves eyebrows downward and medially; horizontal wrinkles of skin of the bridge of the nose

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13
Q

What is the major muscle of the scalp?

A

Epicranius or occiptofrontalis muscle composed of two muscles.

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14
Q

Major muscle of the scalp (epicranius) is composed of which two muscles?

A

–Frontalis muscle (anterior location)

§Origin: Frontal bone

Insertion: Aponeurosis, skin of the eyebrow

Covers the forehead

–Occipitalis muscle (posterior in location)

Origin: Occipital bone

Insertion: Aponeurosis

Action: Horizontal wrinkling of the forehead

The aponeurosis connects the two muscle groups over most of the superior surface of the cranium

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15
Q

What are the Four major muscles of mastication?

A

Temporalis muscle

Medial pterygoid muscle

Lateral pterygoid muscle

Masseter muscle

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16
Q

What is the only muscle of mastication that opens the jaw?

A

lateral pterygoid muscle

17
Q

What is a capsule?

A

Thick, fibrous tissue surrounding joint

18
Q
A