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ANAT 711 H&N mm.

QuestionAnswer
posterior boundary of posterior triangle trapezius m.
anterior boundary of posterior triangle sternocleidomastoid m.
which muscle splits the occipital triangle inferior belly of omohyoid m.
innervation: ventral rami of cervical plexus (motor) actions: flex neck ipsilaterally and elevate 1st and 2nd ribs during forced expiration scalene muscles (anterior, posterior, middle)
which scalene muscle is important for identifying other structures anterior
innervation: spinal accessory n. (CN XI) actions: laterally flexes neck and rotates head sternocleidomastoid m.
posterior boundary of anterior triangle sternocleidomastoid m.
superficial innervation: ansa cervicalis m. action: depresses hyoid bone during swallowing and speaking origin: hyoid bone insertion: sternum sternohyoid m.
has intermediate tendon between two bellies, superficial innervation: ansa cervicalis m. action: depresses hyoid bone during swallowing and speaking omohyoid m.
deep innervation: ansa cervicalis m. action: depresses hyoid bone during swallowing and speaking origin: hyoid bone insertion: thyroid cartilage thyrohyoid m.
deep innervation: ansa cervicalis m. action: depresses hyoid bone during swallowing and speaking origin: thyroid cartilage insertion: sternum sternothyroid m.
intermediate tendon between two bellies actions: depresses mandible when hyoid is fixed and elevates hyoid bone when mandible is fixed during swallowing can work in opposite directions digastric m.
one of two bellies of digastric m. innervation: mylohyoid n. (off CN V) anterior belly
one of two bellies of digastric m. innervation: facial n. (CN VII) posterior belly
innervation: mylohyoid n. actions: elevates hyoid, floor of mouth, and tongue during swallowing and speaking; depress mandible and hyoid during swallowing mylohyoid m.
contributes to forming the floor of the oral cavity, can work in opposite directions mylohyoid m.
innervation: fibers from C1 actions: depresses mandible when hyoid is fixed, elevates hyoid when swallowing deep to mylohyoid m. geniohyoid m.
innervation: facial n. (CN VII) actions: elevates and retracts hyoid bone stylohyoid m.
innervation: cervical branch of facial n. (CN VII) actions: weakly depresses mandible, contributes to facial expression by elevating the neck and depressing facial tissue platysma m.
innervation: marginal mandibular branch of facial n. action: depresses corner of mouth depressor anguli oris m.
innervation: zygomatic and buccal branches of facial n. action: raise corner of mouth laterally zygomaticus major m.
innervation: buccal branch of facial n. action: raises mouth upward levator labii superioris m.
innervation: marginal mandibular branch of facial n. action: closes lips and compresses lips against teeth orbicularis oris m.
innervation: buccal branch of facial n. actions: hold cheek against teeth & keeps them close when chewing and exhaling buccinator m.
pierced by the parotid duct, forms substance of soft cheek buccinator m.
innervation: buccal branch of facial n. actions: compresses and opens nasal cavity nasalis m.
does voluntary eye closure as well as voluntary and reflexive blink orbicularis oculi m.
innervated by posterior auricular and temporal branches of facial n. auricular muscles (anterior, posterior, superior)
innervation: temporal and posterior auricular branches of facial n. actions: move scalp forward, lifts brows, moves ant. scalp backward occipitofrontalis m.
covers dome of the skull, has 4 bellies, connected by epicranial aponeurosis occipitofrontalis m.
platysma, depressor anguli oris, zygomaticus major, levator labii superioris, orbicularis oris, buccinator, nasalis, orbicularis oculi, auricular muscles, and occipitofrontalis muscles of facial expression
masseter, temporalis, lateral pterygoid, medial pterygoid muscles of mastication
infratemporal fossa innervation: mandibular n. (V3) action: powerfully elevates mandible masseter m.
temporal fossa innervation: mandibular n. (V3) actions: powerful mandible elevator and retracts mandible temporalis m.
infratemporal fossa innervation: mandibular n. (V3) actions: protrudes and depresses mandible lateral pterygoid m.
infratemporal fossa innervation: mandibular n. (V3) action: powerfully elevates mandible medial pterygoid m.
only muscle that closes the eye orbicularis oculi m.
innervation: oculomotor n. (CN III), motor actions: elevates/retracts upper eye lid levator palpebrae superioris m.
extraocular muscles (4 muscles have the same) origin: annular tendon insertion: sclera of eye superior rectus, inferior rectus, medial rectus, and lateral rectus mm.
extraocular muscle origin: annular tendon insertion: trochlear apparatus superior oblique m.
extraocular muscle origin: anterior/medial orbit insertion: sclera of eye inferior oblique m.
3 muscles innervation: vagus n. (CN X) action: constrict wall of pharynx constrictor muscles (middle, superior, inferior)
3 muscles innervation: 2 innervated by vagus n. (CN X) and 1 innervated by glossopharyngeal n. (CN IX) action: elevates pharynx and dilation palatopharyngeus, salpingopharyngeus, stylopharyngeus mm.
internal muscle of pharynx innervated by glossopharyngeal n. (CN IX) stylopharyngeus m.
internal muscles of pharynx innervated by vagus n. (CN X) palatopharyngeus and salpingopharyngeus mm.
innervation: external laryngeal n. actions: draws arch of cricoid post. and sup. which tightens and elongates vocal cords, primary tensor of true vocal cords cricothyroid m.
allows us to reach a higher frequency sound, only laryngeal m. innervated by external laryngeal n. cricothyroid m.
innervation: recurrent laryngeal n. actions: pulls muscular process post., med., and down; slides arytenoid post. to open the glottis (abduct) posterior cricoarytenoid m.
only abductor of glottis posterior cricoarytenoid m.
innervation: recurrent laryngeal n. actions: causes muscular process to rotate ant. and lat., adducts glottis, protects lower respiratory sys. lateral cricoarytenoid m.
antagonist of posterior cricoarytenoid m. lateral cricoarytenoid m.
innervation: recurrent laryngeal n. action: pulls arytenoid ant. resulting in decreased tension on vocal cords thyroarytenoid m.
antagonist to cricothyroid m. thyroarytenoid m.
innervation: vagus n. actions: powerful soft palate elevator, blocks and separates oral and nasal cavities when swallowing levator veli palatini m.
innervation: mandibular n. (V3) actions: tenses and lowers soft palate tensor veli palatini m.
belly of this m. tapers down to a tendon which courses around the hamulus of the medial ptergyoid plate to insert on the soft palate tensor veli palatini m.
attaches to soft palate and tongue forms anterior pillar in oropharynx actions: elevates posterior tongue and participates in swallowing innervation: vagus n. palatoglossus m.
attaches to soft palate and pharynx forms posterior pillar to pharynx action: pulls pharynx upward innervation: vagus n. palatopharyngeus m.
innervation: hypoglossal n. actions: pulls tongue forward and downward genioglossus m.
innervation: hypoglossal n. actions: pulls tongue downward and backward hyoglossus m.
innervation: hypoglossal n. actions: pulls tongue backward and upward styloglossus m.
innervation: vagus n. action: pulls tongue upward palatoglossus m.
genioglossus, hyoglossus, styloglossus, palatoglossus extrinsic tongue muscles
levator veli palatini, tensor veli palatini, palatoglossus, palatopharyngeus soft palate muscles
complicated bundles of interlacing fibers, responsible for forming intricate movements such as those required for speech, not attached to bone, change shape of tongue innervation: hypoglossal n. intrinsic tongue muscles
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