GENERAL HISTOLOGY

Detailed explanation-1: -The labial arteries branch from the facial artery at the region where the vermillion border of the upper lip meets the vermillion border of the lower lip. The superior labial artery traverses between the mucosal and upper part of the orbicularis oris muscle.

Detailed explanation-2: -The blood supply is the facial artery, which is branch of the external carotid artery. It passes from medial of the mandible to the lateral side after traveling through the submandibular gland and rounding the lower mandibular inferior border.

Detailed explanation-3: -The blood supply of the external nose is provided primarily by the facial artery, particularly along the lateral aspect and in the lower one-third, with the anterior lateral nasal artery supplying the majority of blood flow to the nasal tip.