Our images of disability are socially and culturally conditioned. Negative attitudes and assumptions, often based on a lack of knowledge, can easily shape the way we behave towards disabled people. It may be necessary for you to re-evaluate your assumptions about disabled people before you can adopt more inclusive approaches to teaching.
DEMOS: Online Materials For Staff Disability Awareness provides an excellent module on disability awareness for staff in higher education institutions.
The British Film Institute provides an online resource on models of disability, stereotyping and imagery.