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Human Evolution and Skull Examination

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  • What are the four primary types of teeth and their functions?
    Incisors: seizing and biting; Canines: gripping and tearing; Premolars: crushing and grinding; Molars: broad teeth for crushing and grinding.
  • How do human premolars differ from ape premolars?
    Human premolars are bicuspids with two cusps, while ape premolars have one cusp used to sharpen canines.
  • What is a key difference in canine teeth between humans and apes?
    Apes have pronounced, sharp canines used for display and aggression; humans have blunt, reduced canines.
  • Describe the lower jaw angle difference between humans and other primates.
    Humans and apes have a rounded lower jaw angle, while other primates have a sharper angle.
  • What are some key skull features of gorillas?
    No forehead, large brow ridge, small braincase, prognathous face, large canines, and large zygomatic arch.
  • What are characteristics of Australopithecus afarensis?
    Bipedal, upright stance, some ape-like features, brain size 350-380 cc, about 3 feet tall.
  • What distinguishes Australopithecus boisei in terms of teeth and skull?
    Largest teeth among hominids, elongated face, increased post-canine teeth size, sagittal crest on mid-braincase, brain size 500-550 cc.
  • List key features of Homo erectus.
    Brain size ~900 cc, reduced post-canine teeth, vertical face shortening, sloping forehead, large brow ridges, humanlike limb proportions, barrel-shaped chest, external nose.
  • What are notable traits of Homo neanderthalensis?
    Lived 23,000-30,000 years ago, upright walking, used over 60 tool types, lived in groups, found in Africa, Near East, Europe, Asia.
  • Describe the skull features of Homo sapiens.
    Vertical forehead, small brow ridge, thin skull, large braincase, flattened face, projecting chin, small molars, shallow lower jaw.
  • How does the human spine differ from ape spine?
    Human spine is S-shaped with a slight curve; ape spine exits from rear of skull and has less curvature.
  • What is the shape difference between human and ape pelvis?
    Human pelvis is bowl-shaped; ape pelvis is longer and narrower.
  • How do human and ape femur angles differ?
    Human femur angles inward toward knees; ape femur angles out slightly.
  • What is the difference in foot arch between humans and apes?
    Humans have an arch in the foot; apes have no arch.
  • What evolutionary trend is seen in brain size from Australopithecus to Homo sapiens?
    Brain size increased significantly, from about 400 cc in Australopithecus to over 1300 cc in Homo sapiens.
  • What is prognathism in primates?
    Prognathism is the forward projection of the face, more pronounced in apes than in humans.
  • What is the function of the zygomatic arch?
    It serves as the surface and attachment point for facial muscles used in chewing.
  • How does the size of front and back teeth differ between apes and humans?
    Apes have larger front teeth than back teeth; humans have larger back teeth than front teeth.
  • What is the significance of the sagittal crest in some hominins?
    The sagittal crest is a ridge on the skull for attachment of strong jaw muscles, seen in species like Australopithecus boisei.
  • What dental formula trend is observed in human evolution?
    There is a reduction in post-canine dentition and jaw size over time.