Anatomy Exam 5

The GI tract is composed of

4 tunics(layers)

Tunics of the Digestive System(deep to superficial)

Mucosa, Submucosa, Muscularis, Serosa

2 Regions of the oral cavity

vestibule and oral cavity proper

Vestibule

Space in front of entrance( between lips and teeth )

Hard Palate

Anterior 2/3, palatine processes of maxillae bones and palatine bones

Soft Palate

Posterior 2/3. muscular structure

Uvula

extends posteriorly from soft palate, elevates during swallowing to close off posterior entrance to nasopharynx

Tongue

Primary skeletal muscle

Lingual Frenulum

Attach underside of tongue to palate

Tongue function

move food around oral cavity, mix food with saliva and assist in swallowing

Salivary Glands

produce and secrete saliva. Moistening ingested materials to become slick bolus. Moistens, cleans and lubricates oral cavity structures . Dissolves food so taste receptors can be stimulated

Parotid Salivary glands

secrete 25-30% of total saliva, largest, parotid ducts run parallel to zygomatic arch pierces buccinator muscle before opening into mouth

Submandibular Salivary Gland

produces most saliva, inferior to the mandible

Where does the submandibular duct open

in floor of mouth next to teeth