Which part/structure of the female reproductive system is homologous to the male penis?

Identify the correct pathway of milk secretion from the mammary glands.

The edges of the infundibulum possess finger-like projections which are called ..........

The following diagram shows a section of the female reproductive system. What are $P, Q,$ and $R$?
$\quad\quad\quad P \quad\quad Q \quad\quad R$

The birth canal in females is called the ...... .

Which of the following statements is incorrect?