214

Front 1

VAGUS NERVE

SUPERIOR LARYNGEAL NERVE
-internal laryngeal nerve

Back 1

b. Internal laryngeal nerve: penetrates the thyrohyoid membrane dei
to the thyrohyoid muscle; provides general sensory innervation
the mucosa ofthe larynx and pharynx, and general sensory and tas
innervation to the very posterior part of the tongue and epiglottis

Front 2

VAGUS NERVE

SUPERIOR LARYNGEAL NERVE
-external laryngeal nerve

Back 2

c. External laryngeal nerve: descends inferior to the oblique line oft
thyroid cartilage, deep to the sternothyroid and superficial to t
inferior pharyngeal constrictor; innervates the cricothyroid and part
of the inferior pharyngeal constrictor

Front 3

VAGUS NERVE

NERVES TO THE CAROTID BODY

Back 3

5. Nerves to the carotid body: provide sensory innervation to the carotid
body, a sensor ofthe oxygen content ofthe blood

Front 4

VAGUS NERVE

RECURRENT LARYNGEAL NERVES
-how do they loop?

Back 4

6. Recurrent laryngeal nerves

a. The right and left recurrent laryngeal nerves loop posteriorly around the right subclavian artery and aortic arch, respectively; they ascend in the grooves between the trachea and esophagus on their respective sides.

Front 5

VAGUS NERVE

RECURRENT LARYNGEAL NERVES
-as they ascend...

Back 5

b. As they ascend posterior to the lobes of the thyroid gland, they enter the larynx and provide general sensory innervation to the mucosa of the larynx and pharynx and motor innervation to all muscles ofthe larynx, except the cricothyroids (which are innervated by the external laryngeal nerves)

Front 6

ACCESSORY NERVE

Back 6

B. Accessory nerve: emerges from the jugular foramen and descends posterioly on the deep surface of sternocleidomastoid, innervating it; passes across
the posterior triangle ofthe neck on levator scapulae and then descends on the deep surface of trapezius, innervating it

Front 7

HYPOGLOSSAL NERVE

-emerges from?
-how does it course?
-vs. ansa cervicalis

Back 7

C. Hypoglossal nerve
1. Emerges from the hypoglossal canal, descends anteriorly in the ne
appears along the inferior border of the posterfor belly of the digastric; here, it hooks around the sternocleidomastoid branch of the occipital artery, gives off the superior root of the ansa cervicalis, and then the branch of the ansa cervicalis

Front 8

ANSA CERVICALIS

MOTOR NERVE

Back 8

D. Ansa cervicalis

1. Motor nerve loop derived from the cervical plexus; consists of a su
rior and an inferior root