Jaws and Teeth. Comparative structure. Reading: Benton, Chapter 10. G404 Geobiology. Department of Geological Sciences Indiana University
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1 Jaws and Teeth Comparative structure Reading: Benton, Chapter 10 Canis familiaris. P.D. Polly
2 Branchial basket of lamprey (agnathan) Barghusen and Hopson, 1979, The Endoskeleton
3 Shark jaws (Chondricthyes) Barghusen and Hopson, 1979, The Endoskeleton
4 Teleost protrusible jaws
5 Comparative jaw muscles in mammal and reptile Barghusen and Hopson, 1979, The Endoskeleton
6 Jaw suspension in vertebrates Hyostylic (condrichthyes) Amphistylic (ancestral condition) Autostylic (Sarcopterygians and tetrapods) Barghusen and Hopson, 1979, The Endoskeleton
7 Structures associated with jaw movements in mammals Temporal Fossa: area for muscle attachment and movement of the mandible, site of muscle attachment Zygomatic Arch: composed of the jugal (or zygomatic) and squamosal bones, muscle attachment along lower margin Coronoid process of the mandible: site of muscle attachment Joint: condyle of the mandible fits into the glenoid fossa of the squamosal (note same name as glenoid fossa of the pectoral girdle) Angular process of the mandible: site of muscle attachment Masseteric fossa of the mandible: site of muscle attachment Dog skull (P. David Polly) (c) 2011, P. David Polly
8 Muscles that move the mandible Temporalis - originates on the side of the braincase, inserts on the coronoid process, pulls the mandible upward and backward. Temporalis Masseter - originates on the zygomatic arch, inserts in the masseteric fossa and on the lateral angle of the mandible, pulls the mandible upward, laterally, and forward. Pterygoideus - originates on the pterygoid plates, inserts on the medial angle of the mandible, pulls the mandible upward, medially, and forward. Masseter Pterygoideus (Evans, Miller s Anatomy of the Dog) (c) 2011, P. David Polly
9 Muscle action to elevate (close) the mammalian mandible Temporalis Masseter Dog skull (P. David Polly) (c) 2011, P. David Polly
10 Dorsal and medio-lateral action of the muscles temporalis masseter pterygoideus (c) 2011, P. David Polly
11 Animated model of teeth in action Note how tall trigonid of lower molars passes between upper teeth and how the protocone of the upper molars slides across low talonid basin of lowers in mortar-and-pestle fashion Model by Alistair Evans, Monash University (c) 2011, P. David Polly
12 Anatomical directions for the dentition Distal Mesial Lingual (or Palatal) Labial (or Buccal)
13 Human jaws and dentition Coronoid process Alveolar bone Condylar process Angular process Homo sapiens. P. D. Polly
14 Tooth eruption in humans
15 Tooth development schematic view
16 Tooth structure, development, and attachment Pleurodont Acrodont Thecodont Barghusen and Hopson, 1979, The Endoskeleton
17 Scales and teeth - developmentally homologous structures Composed of bone, dentine, and enamel (or variants) Develop from interaction between surface ectoderm layer and deeper mesoderm layer Mouth of deuterostomes is formed by invagination of ectoderm to connect with gut tube Gar scales Shark teeth The Fossil Forum
18 Splanchnocranium in humans
19 Innervation of the teeth and mandible Maxillary division of trigeminal (V3) Root of trigeminal nerve (V) Mandibular division of trigeminal (V3) A.D.A.M. Atlas of Anatomy
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