The details of Panchamukaa are:

Hanuman Bhakt Club

The details of Panchamukaa are:

East facing Anjaneya to grant humanity Ishta Siddhi.
South facing Karala Ugraveera Narasimha to grant humanity Abhista Siddhi.
West facing Mahaveera Garuda to grant humanity Sakala Sowbhagya.
North facing Lakshmi Varaha to grant humanity Dhana Prapthi.
Urdhva Mukha {atop} being Hayagriva to grant humanity Sarva Vidya Jaya Prapthi.


The interpretations

1. There are five ways of prayer to the Lord. They are Naman, Smaran, Keerthanam, Yachanam and Arpanam. The five faces depict these five forms. Lord Hanuman always used to Naman, Smaran and Keerthanam of Lord Sri Rama. He totally surrendered (Arpanam) to his Master Sri Ram. He also begged (yachanam) Sri Rama to bless him the undivided love.

2. In Bhagavat Gita Lord Krishna says to Arjun, "He who acts for me, who is engrossed in me, who is my devotee, who is free from attachment, he reaches me" . We find all these 5 qualities enshrined in Hanuman. Each of his face explains the five divine qualifications. May be an artist thought over about this before making the Vigraham.
The origin of Sri Panchamukhs Hanuman can be traced to a story in Ramayana. During the war between Lord Rama and Ravana. Ravana took help of Ahiravanka who is the king of pathala.

Lord Hanuman in order to protect Lord Ram and Lakshman formed a fortress with his tail.Aahiravana took the form of Vibeeshana and took Lord Ram and Lakshman to pathala loka.
Hanuman entered pathala loka in search of Rama and Lakshmana, He found out that to kill Ahiravana he had to extinguish five lamps burning in five different directions at the same time, so he has taken the Panchamukha form with Hanuman, Hayagriva, Narasimha, Garuda and Varaha faces and extinguished the lamps and killed Mahiravana.

According to Hanumath Prakaranam in Sri Vidyarnavatantram, Anjaneya has five faces (Pancha Mukha) and ten weapons. The five faces are that of Lord Hanuman, Lord Narasimha, Lord Adivaraha, Lord Hayagriva, and Lord Garuda.