BIOL 111 Lecture Notes - Lecture 22: Prehensile Tail, Thumb, Homo Habilis

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Rajinder Dhindsa

Document Summary

-highly social reduced brood size & extended parental care: prosimians. Tarsier: new world vs old world monkeys. Prehensile tail used to grasp/hold present in most new world but not old world monkeys. New world monkeys have flat noses & tend to be arboreal: gibbons, orangutans & african apes. African apes (gorillas, chimpanzees, hominids: hominids, ardipithecus (extinct) Have toes that can grasp tree branches: australopithecus (extinct) 35% size of modern human brain: early homo. -first hominid to leave africa & spread to eurasia. -similar body size to modern humans, but smaller brain & thick skull: recent homo. -larger brain than earlier species favoring increasingly complex social life: other species coexisted with homo sapiens (homo floresiensis) Smaller skull than sapiens: mammalian (human) nervous system, central nervous system (cns) Long tube inferior to it (spinal cord: peripheral nervous system (pns) Spinal nerves from the spinal cord: parasympathetic nerves ( rest & digest ) & sympathetic nerves ( fight or flight , cerebrum.