Which of the following structures of the pericardium is insensitive to pain:
Answer is C (Visceral layer of Serous pericardium) The visceral layer of serous pericardium is insensitive to pain. The visceral layer of the serous pericardium is supplied by the sympathetic trunk and branches of the vagus nerves which are Pain Insensitive Note : The pain of pericarditis typically originates only from the pain sensitive parietal layer (lower two thirds) and is transmitted by the phrenic nerve. Pain from the hea(angina) originates in the muscles and vessels and is transmitted by sympathetic nerves Fibrous pericardium and Parietal layer of the Serous Pericardium are supplied by the phrenic nerve and are pain sensitive Nerve Supply of The Pericardium Phrenic nerves (C3-05) (This is the primary source of sensory fibres) Pain sensations conveyed by these nerves are commonly referred to the skin (C3 -05 dermatomes) of the ipsilateral supraclavicular region (top of the shoulder of the same side). Vagus nerve (Their function is unceain) Sympathetic trunks (Vasomotor)
Fibrous Pericardium
Parietal layer of Serous pericardium
Visceral layer of Serous pericardium
All of the above