HBIO 301 MUSCLES EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS GRADED A++ LATEST UPDATE
Corrugator supercilii
"Wrinkle eyebrow"
- Superior to the eye (eyebrow area).
- Draws eyebrows medially and inferiorly; wrinkles skin on forehead vertically
Levator labii superioris
"Raise lip superior"
- Thin muscle between orbicularis oris (mouth) and inferior eye margin.
- Opens lips; elevates and furrows upper lip
Zygomaticus
"Cheekbone"
- Muscle pair (major & minor) extending diagonally from cheekbone to corner of mouth.
- Raises lateral corners of mouth (smiling muscle)
Mentalis
"Chin"
- Forms V-shape on chin.
- Wrinkles chin; protrudes lower lip
Orbicularis oris
"Mouth"
- Circular muscle around the mouth; multilayered w/ fibers running in different directions.
- Closes lips; purses & protrudes lips; whistling/ kissing
,Buccinator
"Cheek // Trumpeter"
- Horizontal cheek muscle; principal muscle of cheek!
- Compresses cheek (whistling and sucking); draws corner of mouth laterally; holds food
between teeth during mastication; develops in nursing infants
Orbicularis oculi
"Circular eye"
- Surrounds rim of eye; flat sphincter muscle of eyelid.
- Closes eye; produces blinking & squinting, draws eyebrows inferiorly
Temporoparietalis
- Sides of the scalp (temporal region).
- Tenses scalp; wiggles ears (auricle)
Occipitofrontalis Frontal Belly
- covers forehead.
- elevates eyebrows (like in surprise); wrinkles forehead skin horizontally
Occipitofrontalis Occipital Belly
- covers the back of the head (occipital region).
- fixes aponeurosis & pulls scalp posteriorly
Platysma
"Broad // flat"
- Thin, sheetlike neck muscle; extends from jaw to chest.
- Tenses skin of neck; helps depress mandible; pulls lower lip down and back; creates
"turkey neck"
, Inferior rectus eye
- Bottom of the eyeball
- Eye looks inferiorly
Medial rectus eye
- Most medial side of the eyeball (be mindful of right & left)
- Eye looks medially
Superior rectus eye
- Top of the eyeball
- Eye looks superiorly
Lateral rectus eye
- Most lateral side of the eyeball (be mindful of left & right)
- Eye looks laterally
Inferior oblique eye
- Underside of the eyeball; cuts across from the lateral side toward the middle
diagonally.
- Eye rolls; looks superiorly & laterally
Superior oblique eye
- Upperside of the eyeball; on the lateral side and originates on the sphenoid —> goes
toward the back of the head.
- Eye rolls; looks inferiorly and laterally
Masseter
- Zygomatic arch to mandible.
- Elevates mandible, closes jaw
COMPLETE SOLUTIONS GRADED A++ LATEST UPDATE
Corrugator supercilii
"Wrinkle eyebrow"
- Superior to the eye (eyebrow area).
- Draws eyebrows medially and inferiorly; wrinkles skin on forehead vertically
Levator labii superioris
"Raise lip superior"
- Thin muscle between orbicularis oris (mouth) and inferior eye margin.
- Opens lips; elevates and furrows upper lip
Zygomaticus
"Cheekbone"
- Muscle pair (major & minor) extending diagonally from cheekbone to corner of mouth.
- Raises lateral corners of mouth (smiling muscle)
Mentalis
"Chin"
- Forms V-shape on chin.
- Wrinkles chin; protrudes lower lip
Orbicularis oris
"Mouth"
- Circular muscle around the mouth; multilayered w/ fibers running in different directions.
- Closes lips; purses & protrudes lips; whistling/ kissing
,Buccinator
"Cheek // Trumpeter"
- Horizontal cheek muscle; principal muscle of cheek!
- Compresses cheek (whistling and sucking); draws corner of mouth laterally; holds food
between teeth during mastication; develops in nursing infants
Orbicularis oculi
"Circular eye"
- Surrounds rim of eye; flat sphincter muscle of eyelid.
- Closes eye; produces blinking & squinting, draws eyebrows inferiorly
Temporoparietalis
- Sides of the scalp (temporal region).
- Tenses scalp; wiggles ears (auricle)
Occipitofrontalis Frontal Belly
- covers forehead.
- elevates eyebrows (like in surprise); wrinkles forehead skin horizontally
Occipitofrontalis Occipital Belly
- covers the back of the head (occipital region).
- fixes aponeurosis & pulls scalp posteriorly
Platysma
"Broad // flat"
- Thin, sheetlike neck muscle; extends from jaw to chest.
- Tenses skin of neck; helps depress mandible; pulls lower lip down and back; creates
"turkey neck"
, Inferior rectus eye
- Bottom of the eyeball
- Eye looks inferiorly
Medial rectus eye
- Most medial side of the eyeball (be mindful of right & left)
- Eye looks medially
Superior rectus eye
- Top of the eyeball
- Eye looks superiorly
Lateral rectus eye
- Most lateral side of the eyeball (be mindful of left & right)
- Eye looks laterally
Inferior oblique eye
- Underside of the eyeball; cuts across from the lateral side toward the middle
diagonally.
- Eye rolls; looks superiorly & laterally
Superior oblique eye
- Upperside of the eyeball; on the lateral side and originates on the sphenoid —> goes
toward the back of the head.
- Eye rolls; looks inferiorly and laterally
Masseter
- Zygomatic arch to mandible.
- Elevates mandible, closes jaw
