Like I said, in some classes attendance is taken and it is usually because it is a hands-on type of class like OMM or a class no one would attend but is necessary. In those classes attendance or quizes are worth a small part of your grade. Most classes there are no attendance. I have learned to back up my statements by saying: this is how it has been for me but anything can change.
Anatomy: Anatomy is taken in the spring here of your first year. I believe the original reason is because we shared professors with our sister school, Robert Wood Johnson, and they had anatomy in the fall. The way it is set up now is you have anatomy Thursdays and Fridays all day spring semester, morning lecture and afternoon lab. There is one cadaver per four people which is really an ideal number and generally help is available in the lab for IDing or dissecting out delicate things. The grade is based on written exams, diagnostic imaging exam (x-rays, CT, and MRI), and the lab practical which is mostly identify the tagged item on the cadavers, bones, or x-rays. The class is split into 3 sections: back and limbs, head and neck, and chest/abdomen.
We don't have anatomy the second year but you still have to review it for OMM, medicine, and the boards. That goes for most things, they are repeated second year but in a more clinical way.