325.The answer is c.(Moore and Dalley, pp 945–947, 954–955.)One of
the risks of the surgical resection is that she may develop right-sided facial
muscle paralysis. About 80% of salivary gland tumors originate from
within the parotid salivary gland. The facial nerve sends out motor neurons
from the stylomastoid foramen. This nerve then branches into 5 to 7 major
branches that innervate the muscles of facial expression (derived from the
second branchial arch). The branches divide while passing through the
substance of the parotid salivary gland. The branches are named for their
anatomic regions that they serve: temporal; zygomatic; buccal; mandibu-
lar; cervical; and posterior auricular branches. While it is unlikely all of
these branches would be cut while removing the parotid tumor, they all are
potentially at risk. The tumor is described as superficial within the parotid
salivary gland and since the facial nerve normally passes through the mid-
dle of the gland, the facial nerve might be spared. She is very unlikely to
lose the ability to taste (answer a).That information is carried in the
456 Anatomy, Histology, and Cell Biology
I Mandible, Malleus, incus anterior Auditory tube, middle-ear cavity
part of tongue, muscles mastication,
tensor tympani m., tensor veli
palatini m., mylohyoid m.,
antr. belly of the digastric m.,
trigeminal nerve.
II Lesser horn of the hyoid, styloid Tonsillar fossa
process, stapes m., muscles of
facial expression, stapedius m.
styloid hyoid m., post. belly of
the digastric m., facial cranial n.
III Greater horn of hyoid, posterior Vallecular recess,
part of tongue, stylopharyngeus m. inferior parathyroid glands
glossopharyngea cranial n. thymus gland
IV Thyroid cartilage, cricothyroid m. Superior parathyroid glands
superior laryngeal nerve.
VI Cricoid and arytenoid cartilages Laryngeal ventricle
intrinsic muscles of the larynx
recurrent laryngeal nerveTABLE OF PRINCIPAL BRANCHIAL DERIVATIVES
Arch Pouch