Digestive Anatomy Lecture 3 - Teeth, Jaws, and their Movements

These flashcards cover key concepts and details regarding the structure, classification, and function of teeth and jaws, as discussed in the lecture on Digestive Anatomy.

What are the three mineralized tissues that compose a tooth?

Enamel, Dentine, and Cementum.

What is the hardest substance in the body?

Enamel.

Define crown, root and neck of tooth

Crown: protruding above the gingiva and covered in enamel

Root: concealed by gingiva and not covered in enamel. Contains pulp.

Neck: junction between root and crown

What are ameloblasts responsible for?

The formation of enamel.

What is dentine compared to?

Bone.

What do odontoblasts do?

They form dentine and remain alive for the life of the tooth.

What is the role of the periodontal membrane?

It holds the tooth in place.

What type of teeth are characterized by deep roots and stop growing after reaching adult size?

Brachydont teeth.

Which type of teeth have high crowns and may continue to erupt for a long time?

Hypsodont teeth.

What is the dental formula for dogs?

2(I 3/3 C 1/1 P 4/4 M 2/3) = 42.

What are carnassial teeth?

The big cutting teeth in dogs (P4/M1) and cats (P3/M1).

What are deciduous teeth?

Temporary teeth in young animals that are smaller and fewer in number than permanent teeth.

What influences tooth replacement in animals?

The growing permanent tooth on the lingual side of the deciduous tooth.

How can the shape and number of tooth roots vary in dogs?

Incisors have one root, canines have one long root, and premolars and molars may have multiple roots.

What do you call a mandible that is too short?

Brachygnathic.

What is the term for a mandible that is too long?

Prognathic.

Which muscles are involved in closing the jaw?

Temporalis, Masseter, Lateral Pterygoid, and Medial Pterygoid.

Which cranial nerve controls mouth opening?

Facial nerve (CN VII).

What controls the closing of the mouth and is the main sensory nerve of the face?

Trigeminal nerve (CN V).