CCAE Test 2

Zygomatic arches

• part of the skull that runs horizontally against skull

• bigger arches means bigger chewing muscles (flared zygomatic arches)

• cheekbones

2:1:2:3

2 incisors, 1 canine, 2 pre-molars, 3 molars

Prognathism

• the slope of the head

• more slope - less human like

Sagittal Crest

• crest on top of head that connects the big chewing muscles 

• bigger = stronger chewing muslces

Foramen Magnum

• the hole that the spine connects to the skull through

• the angle helps determine if the organism is bipedal or not

Canines in gorillas

• used to show dominance 

• is used in sexual selection 

turkana boy

• homo erectus

• nariokotome

• 1.5 Ma

fad and lad

first appearance datum and last appearance datum

Miocene

• 23-4.5 Ma

• warmer period

mesozoic 

• mammals were all very rodent like 

  • all major living groups of mammals explode during this time

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