BIO 122 Spring, 2010

Laboratory 22

Tongue, Oral cavity and Submandibular region

OBJECTIVES

At the end of this laboratory you should know and understand:

1. Important anatomical landmarks of the and oral cavity and adjacent oropharynx including the vestibule, tongue, lingual tonsils, ostia for the ducts of the salivary glands, palatine tonsils with related folds (palatoglossal and palatopharyngeal), and uvula.

2. In association with the posterior 1/3^rd of the tongue, you should know the sulcus terminalis, foramen cecum, epiglottis, median and lateral glossoepiglottic folds, aryepiglottic folds, inlet of the larynx (aditis laryngis), piriform recess and the valleculae of the epiglottis.

3. The organization and attachments of the muscles of the cheek (buccinator), intrinsic and extrinsic muscles of the tongue, and the suprahyoid muscles.

4. The features of the maxilla and mandible that relate to the teeth; the types, surfaces, and innervation of the teeth.

5. The sensory and motor nerves related to the structures of the oral cavity, as branches of the major nerves:

a. Maxillary division

palatine nn.

superior alveolar nn.

b. Mandibular division

buccal n.

lingual n.

inferior alveolar n.

c. Facial n.

chorda tympani

d. Glossopharyngeal n.

e. Hypoglossal n.

6. The mechanisms of swallowing; know the potential role of each of the following:

a) orbicularis oris muscle

b) buccinator muscle

c) tongue (intrinsic and extrinsic mm)

d) soft palate (tensor and levator palatini).

e) constrictor muscles of pharynx

f) hyoid musculature

g) cricopharyngeus muscle

h) esophageal musculature

i) salivary glands

PRELAB PREPARATION

1. Read the parts of Moore and Dalley on the oral cavity, tongue and salivary glands (pp. 987-1010).

2. Study the section on branches of cranial nerves V, VII and XII as they are distributed to the oral cavity (Chapter 9).