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Teeth / Jaw Diet

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the lower jaw mandiblerelated term: - PowerPoint PPT Presentation


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Continue on to Set # 16C. Teeth / Jaw Diet. the lower jaw = mandible related term: “mandibular torus”. The jaw . . . in apes mandibles slant outward and downward, without a chin (“prognathism”) . Pongid Prognathism . (Line of greatest muscle force is shown in red.).

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slide2
the lower jaw =

mandible

related term:

“mandibular torus”

the jaw
The jaw . . .

in apes mandibles slant outward and downward, without a chin

(“prognathism”)

slide4

Pongid Prognathism.

(Line of greatest muscle force is shown in red.)

Understanding Physical Anthropology and Archaeology, 8th ed., p. 245

the jaw5
The jaw . . .

in humans lower jaw is comparatively small, but always has a distinct chin

slide6

Modern human cranium.

Understanding Physical Anthropology and Archaeology, 9th ed., p. 432

the teeth
The teeth . . .

apes have a “simian shelf” rather than a chin

the teeth10
The teeth . . .

ape teeth have cusp patterns for the lower molars similar to those of humans . . .

the teeth11
The teeth . . .

rather than a “plus-4” pattern . . .

apes have a “Y-5” pattern

slide12

plus-4

Y-5

Y-5

the teeth14
The teeth . . .

apes (and monkeys) still possess conical, daggerish canines which project well beyond the surface of the opposite teeth . . .

the teeth16
The teeth . . .

apes (and monkeys) have diastemata, spaces opposite the large canine teeth. . .

(“diastemata” = plural of “diastema”)

the teeth17
The teeth . . .

diastema =

a space in the tooth row that accommodates one or more teeth from the opposite jaw

slide18

Teeth of a male patas monkey.

Understanding Physical Anthropology and Archaeology, 9th ed., p. 205

the teeth19
The teeth . . .

both apes and humans have

8 incisors I

4 canines C

8 premolars P

12 molars M

abbreviations

the teeth20
The teeth . . .

both apes and humans have the same “dental formula”

2.1.2.3. 2.1.2.3.

slide21

Donald Johanson and Maitland Edey,

Lucy: The Beginnings of Humankind. NY: Simon & Schuster, 1981.

slide22

Dental formulae

Understanding Physical Anthropology and Archaeology, 9th ed., p. 120

the teeth23
The teeth . . .

apes have a “U”-shaped jaw . . .

the teeth26
The teeth . . .

in humans the plate is arched and curves outward at the back (parabolic arch) . . .

the teeth29
The teeth . . .

the overall evolutionary trend is toward smaller teeth

slide31

Continue on to Set # 16D

Next: Other Changes

Understanding Physical Anthropology and Archaeology, 9th ed., p. 136

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