Final answer:
The nostril, corner of the mouth, and behind the earlobe are points of entry for treating sunken tissues with hypodermic injections. These treatments typically aim at cosmetic improvements by targeting muscles like the orbicularis oris for facial enhancements. Understanding the underlying facial anatomy, including the dermis and its role, is critical for such procedures.
Step-by-step explanation:
The hidden points of entry such as the nostril, corner of the mouth, and behind the earlobe are commonly used for hypodermic injections to treat sunken tissues. These areas allow for subtle and discreet access to the underlying dermal and subdermal layers where various types of fillers or other injectable treatments can be administered. In particular, treatments in these areas are often aimed at cosmetic improvements, such as reducing the appearance of wrinkles or adding volume to the facial features. For instance, the orbicularis oris muscle, located underneath the corners of the mouth, can be targeted to enhance lip volume or reduce surrounding skin laxity.
When considering the muscles of the face, areas like the orbicularis oris, the corrugator supercilii which controls the eyebrows, and the masseter which affects the jawline are potential sites for such interventions. The complex facial structure, including muscles and other tissues, is supported by the dermis, which contains connective tissue, blood vessels, nerves, and is where the facial expression muscles like the inferior oblique are anchored.
The hypodermis, which lies beneath the dermis, serves functions like organ protection, body temperature regulation, and long-term energy storage but doesn't provide blood vessels to the epidermis. This understanding of facial anatomy is vital in procedures aimed to rejuvenate or enhance facial features through injections targeted at subdermal tissue structures.