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Muscles for Facial Expressions

Muscles for Facial Expressions

The craniofacial muscles are a collection of approximately 20 thin skeletal muscles situated beneath the skin of the face and scalp. These muscles, primarily responsible for the vast array of human facial expressions, originate from the bones or fibrous structures of the skull and extend outwards to connect with the skin. While most skeletal muscles in the body are enveloped in thick fascia, facial muscles generally have a more delicate fascial covering, with the buccinator muscle being a...

Facial Feedback Hypothesis

Facial Feedback Hypothesis

Charles Darwin proposed that facial expressions are an evolutionary adaptation for communication. He argued that these expressions are not influenced by culture but are universal across species. For example, a snarling expression with exposed teeth signals a threat in many animals, including humans. Darwin also suggested that displaying an emotion can intensify the feeling. Smiling, for example, could enhance one's sense of happiness. This idea laid the foundation for understanding the role of...

Tissue Renewal without Stem Cells

Tissue Renewal without Stem Cells

After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
However, failure of such a system...

Cardiopulmonary Resuscitation II: ACLS Airway Management

Cardiopulmonary Resuscitation II: ACLS Airway Management

Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned under...

Oxygen Delivering System I: Nasal Cannula and Face Mask

Oxygen Delivering System I: Nasal Cannula and Face Mask

The human body requires oxygen to function, and when the natural process of respiration is hindered, external devices, including the following, are needed to help deliver this vital gas.
Nasal Cannula
A nasal cannula is a lightweight tube split at one end into two prongs and placed in the nostrils. It is typically used to deliver low to medium levels of oxygen.
Suggested flow rate: The suggested flow rate for a nasal cannula typically ranges between 1 and 6 L/min.
Oxygen percentage setting:...

Work Done During Volume Change

Work Done During Volume Change

In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as

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Related Experiment Video

Updated: Jun 24, 2026

Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

Published on: December 9, 2025

The volumetric face lift.

Richard Ellenbogen, Anthony Youn, Dan Yamini

Aesthetic Surgery Journal

|April 2, 2009

Summary

This facelift technique avoids manipulating deeper facial layers, instead using fat grafting for volume and removing excess fat for a natural, youthful appearance with high patient satisfaction.

Area of Science:

Plastic Surgery
Facial Rejuvenation

Background:

Traditional facelifts often target the superficial musculoaponeurotic system (SMAS) but can lead to inadequate volume restoration.
Fat grafting is a potential solution for volume deficits post-facelift.

Purpose of the Study:

To describe a novel facelift technique combining fat grafting for volume restoration with targeted fat removal and conservative skin redraping.
To evaluate the efficacy and safety of this simplified approach.

Main Methods:

Utilized a short-scar incision with limited subcutaneous flap dissection.
Performed direct defatting below the mandible and submental lipoplasty as needed.
Employed suspension sutures for skin redraping and fat grafting into volume-deficient areas, avoiding SMAS manipulation.

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Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

Surgical Approach to Full Soft Tissue Face Allograft Procurement for Vascularized Composite Allotransplantation

Surgical Approach to Full Soft Tissue Face Allograft Procurement for Vascularized Composite Allotransplantation

Published on: December 30, 2025

Related Experiment Videos

Last Updated: Jun 24, 2026

Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

Published on: December 9, 2025

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

Surgical Approach to Full Soft Tissue Face Allograft Procurement for Vascularized Composite Allotransplantation

Surgical Approach to Full Soft Tissue Face Allograft Procurement for Vascularized Composite Allotransplantation

Published on: December 30, 2025

Main Results:

A retrospective review of 83 patients demonstrated high patient satisfaction.
The overall complication rate was 6% at a mean follow-up of 12 months.

Conclusions:

This technique offers a simpler, effective method for facial rejuvenation.
It achieves a natural, youthful appearance with minimal morbidity and downtime.