Textbook Notes (362,796)
Canada (158,054)
Anthropology (232)
ANT333Y1 (6)
Chapter 4

Chapter Four - Dentition.docx

2 Pages
Unlock Document

University of Toronto St. George
Shawn Lehman

Chapter Four - Dentition  Heterodonty – differently shaped teeth – plesiomorphic mammalian trait  All primate have deciduous teeth and then permanent teeth  Some strepsirhine species have lost some or all of their incisors in the maxilla due to adaptations o E.g, the aye-aye  Some strepsirhines have a big gap (diastema) between the two centeral incisors of the upper jaw  To accommodate large canines, there is a diastema behind the maxillary incisors and the mandibular canines.  In most species, canines are just for show  Premolars often have two cusps  All catarrhines have two premolars on either side of the upper or lower jaw  Platyrrhines and strepsirhines all have three premolars  Ancestral primate had four premolars; evolutionarily, a reduction in teeth has been seen  Strepsirhines have more triangular-shaped molar teeth, especially in the upper jaw  Monkeys have more square-shaped molars with four cusps  Asian monkeys have evolved to have pairs of cusps – Bilophodonty (+4 pattern) – pairs are connected by transverse ridges  Leaf eating monkeys have raised cusps with sharp crests between the cusps on either sized of the tooth  Omnivorous and fruit-eating monkeys tend to have lower and more rounded cusps  Apes have square molar teeth that are more elongated towards the back because the presence of a fifth cusp – Y-5 pattern  Cusps tend to be very low and rounded  Chewing surface is much more flat for better crushing  Most primates have three molars, while some callitrichids have only two – possibly because a reduction in body size  Humans seem to be losing third molar as well
More Less

Related notes for ANT333Y1

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.