Excessive hemorrhage from tonsillectomy is due to injury of the –
First, I need to recall the anatomy of the tonsil region. The tonsils are located in the oropharynx, and during a tonsillectomy, the surgeon removes the palatine tonsils. The main blood supply to the tonsils comes from several arteries. The primary one is the tonsillar branch of the facial artery, which is a branch of the external carotid artery. So if the external carotid artery is injured, that would cause significant bleeding.
Wait, but there are other arteries that supply the tonsils too. The lingual artery, ascending pharyngeal artery, and maybe the maxillary artery? But the facial artery is the main one. So if the external carotid artery is damaged, that's a major vessel, leading to heavy bleeding. The question is about excessive hemorrhage, so the answer must be the main arterial supply.
The other options might be distractors. Let's think about the options. If the options included internal carotid artery, that's deeper and less likely to be injured during a tonsillectomy. The internal jugular vein is in the neck but not the main source for the tonsils. The maxillary artery is a branch of the external carotid, but it's more involved in the face. The lingual artery is a branch of the external carotid as well, but it's a different branch. So the main one is the facial artery, which is a branch of the external carotid. So injury to the external carotid artery would affect the facial artery and lead to bleeding.
Wait, but the question says "injury of the" so the answer is the external carotid artery. Because the facial artery is a branch of it, and injury to the main artery would cause more severe bleeding. Alternatively, maybe the internal carotid artery is a distractor, but it's not in the area. So the correct answer is external carotid artery. Let me confirm the options. The original question's correct answer is C. External carotid artery. That makes sense. The other options would be things like internal carotid, facial artery, lingual artery, etc. So the explanation should focus on the external carotid being the main artery, and its branches supplying the tonsils. If the main artery is injured, that's a big deal. The clinical pearl is to be cautious of the external carotid artery during surgery to prevent such hemorrhage.
**Core Concept**
Excessive hemorrhage after tonsillectomy is typically caused by injury to the **external carotid artery** or its branches, which are the primary blood supply to the tonsillar region. The facial artery (a branch of the external carotid) and lingual artery are critical vessels in this area.
**Why the Correct Answer is Right**
The **external carotid artery** (and its branches, particularly the facial artery) supplies the tonsils. During tonsillectomy, injury to the external carotid artery or its branches (e.g., facial artery) can lead to life-threatening hemorrhage.