Download SSN Anatomy #2

SSN ANATOMY
Workshop 6: Head & Neck II
1. Muscles of Mastication (p. 607)
Muscle
Temporalis
Origin
Masseter
Zygomatic
arch
Lateral
Pterygoid
(Superior
Head)
Lateral
Pterygoid
(Inferior Head)
Insertion
Action
(bilaterally) Protracts
jaw
(unilaterally)
Abducts jaw
(grinding)
Elevates jaw
2. What other muscles are innervated by the same cranial nerve as the muscles of
mastication (and which nerve)?
3. To help buy expensive medical textbooks you have decided to start babysitting. The
two little monsters you are watching tonight have come up with a new game. Cindy
sticks her finger in Mindy’s ear and Cindy coughs. Mindy sticks her finger in Cindy’s ear
and Cindy coughs. After sending them both to bed, you grab your anatomy book to see
what’s going on. (April 643).
4. Pterygopalatine fossa (April, 603)
Bone
Foramen/Canal
Posterior Wall
1.
Medial Wall
1.
Anterior Wall
Posterior surface of
the maxilla
What They
Transmit
1.
1.
1.
2.
2.
3.
3.
Roof
Inferior
Boundary
1.
1.
5. Trace the pathway that mediates parotid gland salivation (April, 598).
6. While on selective in the ER, your preceptor takes off early for the day and tells you to
hold down the fort. A patient comes in with the right side of his face expressionless and
drooping and with a steady stream of drool pouring out of the right corner of his mouth.
He complains of difficulty chewing his food. You also notice what you think are several
corneal abrasions. What nerve has been injured and how can you localize the site of the
lesion? (April, 613)
.
7. Why is the maxillary sinus particularly prone to infection?
8. Name the branches of the external carotid artery in order of emergence from inferior
to superior.
Nerve Quickies
9. What branch of what cranial nerve mediates the sneeze reflex?
10. What is the test for a lesion of CN XII?
11. All of the “glossus” muscles are innervated by the hypoglossal nerve (CN XII) except
________, which is innervated by ________ ?
12. All of the “hyoid” muscles are innervated by branches of the ansa cervicalis except
_________ and __________, which are innervated by _________ and __________,
respectively. The only other muscle (one without hyoid in its name) innervated by the
ansa cervicalis is __________, another strap muscle.
13. All the muscles of the pharynx are innervated by the Vagus (CN X) except
________, which is innervated by ____________.
14. What physical finding is characteristic of a unilateral CN X lesion? What is the most
obvious consequence of a bilateral lesion?
15. What’s the only muscle associated with the soft palate not innervated by CN X?