Muscle Actions and Innervations Flashcards
Platysma
“growl” muscle; Facial n. (VII)
Orbicularis oris
“snarl” muscle; Facial n. (VII)
Buccinator
return food from vestibule to occlusal surface of teeth; Facial n. (VII)
Levator nasolabialis
dilates nostril, raises superior lip; Facial n. (VII)
Orbicularis oculi
close palpebral fissure; Palpebral n. (branch of VII)
Cricothyroid
tense vocal fold; Cranial laryngeal n.
Dorsal cricoarytenoid
opens glottis; Caudal laryngeal n.
Lateral cricoarytenoid
closes glottis; Caudal laryngeal n.
Thyroarytenoid and Vocalis
relax vocal fold; Caudal laryngeal n.
Temporalis
close jaw; branch of Mandibular n. (Trigeminal V3)
Masseter
close jaw; branch of Mandibular n. (Trigeminal V3)
Pterygoid
close jaw; branch of Mandibular n. (Trigeminal V3)
Digastricus
open jaw; branch of Mandibular n. (Trigeminal V3)
Styloglossus
retract and elevate tongue; Hypoglossal n. (XII)
Hyoglossus
retract and depress tongue Hypoglossal n. (XII)
Genioglossus
protrude tongue, retract apex of tongue; Hypoglossal n. (XII)
Sternohyoid
pull tongue and larynx caudally; ventral branches of cervical spinal nerves and Hypoglossal n. (XII)
Thyrohyoid
pull tongue and larynx caudally; ventral branches of cervical spinal nerves and Hypoglossal n. (XII)
Mylohyoid
sling that supports tongue; Mylohyoid n. (branch of Trigeminal V3)
Geniohyoid
draw hyoid apparatus and larynx rostrally; Hypoglossal n. (XII)
Cricopharyngeus
swallowing; pharyngeal branches of Glosspharyngeal (IX) and Vagus (X) n.
Thyropharyngeus
swallowing; pharyngeal branches of Glosspharyngeal (IX) and Vagus (X) n.
Hyopharyngeus
swallowing; pharyngeal branches of Glosspharyngeal (IX) and Vagus (X) n.
Levator palpebrae
elevates superior lid; Oculomotor n. (III)
Dorsal Oblique
rotate eye around longitudinal axis from anterior to posterior through center of eye; Trochlear n. (IV)
Ventral Oblique
rotate eye around longitudinal axis from anterior to posterior through center of eye; Oculomotor n. (III)
Dorsal Rectus
rotate eye around horizontal axis through equator medial to lateral; Oculomotor n. (III)
Lateral Rectus
rotate eye around a vertical axis through equator dorsal to ventral; Abducent n. (VI)
Medial Rectus
rotate eye around a vertical axis through equator dorsal to ventral; Oculomotor n. (III)
Ventral Rectus
rotate eye around horizontal axis through equator medial to lateral; Oculomotor n. (III)
Retractor Bulbi
pull eye into socket; Abducent n. (VI)
