Motor Flashcards
Trigeminal V1- Mandibular
- mandibular br
- masseter
- tensor veli palatini
- anterior belly of the digastric
- mylohyoid
- temporalis
- lateral pterygoid
What CN innervates the closing of the nasopharynx and oropharynx to stop nasal regurgitation
CN V1 (Mandibular)
Facial VII
- buccinator
- orbicularis oris
- levator labii superioris
- zygomatic major
- depressor labii
- stylohyoid
- *oral prep and transport
Muscle responsible for smiling
zygomatic major
muscle that depresses lower lip into a frown
depressor labii
Glossopharyngeal IX
- stylopharyngeus
- connects styloid process of temporal bone and hyoid
Special information about CN IX motor function
aids in dilation of the pharynx to vomit/expel materials; during swallow: aids in shortening of the pharynx
CN IX swallowing stage
oral transport and beginning of the pharyngeal stage (pharyngeal trigger)
Vagus X; Pharyngeal br.
Innervates:
- anterior/posterior faucial pillars
- salpilngopharyngeus
- levator veli palatini
- superior, medial, inferior pharyngeal constrictor
- cricopharyngeal m.
salpilngopharyngeus
elevates the upper lateral pharyngeal walls, nasopharynx
levator veli palatini
elevates soft palate; seals the nasopharynx from the oropharynx
What CNs is the cricopharyngeal muscle controlled by?
Vagus: Pharyngeal br
RLN, and external br. of SLN
Plexus
CN IX and X
Vagus; external br of SLN
- cricothyroid and UES
Cricothyroid and UES function in swallowing
plays no role in deglutition but gives us an idea about sensory integrity of the larynx
Vagus X; RLN
- Thyroarytenoid (TA)
- oblique
- transverse aryetnoid
- lateral cricoarytenoid
- posterior cricoarytenoid
- posterior cricoarytenoid
- *Closes off the airway at the level of the VF for the swallow
- *Helps in producing effective coughing
only laryngeal muscle that opens the glottis
posterior cricoarytenoid
muscle that adducts the arytenoids
lateral cricoarytenoid
Hypoglossal XII
- intrinsic muscles
- extrinsic muscles
- hypoglossus
- genioglossus
- styloglossus
- *oral/lingual manipulation
depresses/retracts the tongue
hyoglossus
protrudes apex of the tongue; depresses the medial portion of the tongue by making it concave from side to side
genioglossus
draws tongue up (elevates) and back
styloglossus
T/F The genioglossus is a small muscle
FALSE…Its big!!
Cervical plexus nerves
IX; X
Cervical plexus muscles
- geniohyoid
- thyrohyoid
- sternohyoid
- omohyoid
Muscles that elevate the hyoid
- Geniohyoid
- Thyrohyoid
- Mylohyoid
- stylohyoid
- anterior belly of the digastric
Geniohyoid function
elevation and anterior movement of the hyoid
thyrohyoid function
- approximates thyrohyoid and hyoid
- with hyoid fixed; it raises the thyroid during the swallow
- with larynx fixed; it lowers the hyoid
mylohyoid function
- elevates the hyoid bone during the swallow
- helps depressing in the jaw
CN that innervates the mylohyoid
CN V
stylohyoid function
- suprahyoid muscle that elevates the hyoid
- helps to retract the tongue
- bridges styloprocess on temporal bone to hyoid bone
CN that innervates the stylohyoid
VII
Anterior belly of the digastric
- elevates hyoid if jaw fixes during the swallow
- helps in depressing the jaw
CN that innervates the anterior belly of the digastric
CN V
What happens when cricothyroid and UES are contracted
They elevate pitch by lengthening VF so they vibrate faster
T/F Crycothyroid and UES play a role in deglutition
FALSE but it gives us an idea about sensory integrity in the larynx
Vagus X; Recurrent laryngeal nerve (RLN)
- thyroarytenoids
- oblique
- transverse arytenoids
- posterior cricoarytenoid
RLN function
Close off airway at the level of the VF; helps in producing an effective cough
Extrinsic muscles of the tongue
- genioglossus
- hyloglossus
- styloglossus
- palatoglossus
genio-
chin
omo-
shoulder
genioglossus
- depresses center of the tongue
- protrudes the tongue
palatoglossus
depress the palate
elevate the tongue
-glossus
tongue
what CN is the cricothyroid innervated by?
External branch of the SLN
all muscles of the larynx (except one) are innervated by which CN?
Motor RLN
