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Related Concept Videos

The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
Muscles for Facial Expressions01:14

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...
Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

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Related Experiment Video

Updated: Jun 18, 2026

Isolation of Intermediate Filament Proteins from Multiple Mouse Tissues to Study Aging-associated Post-translational Modifications
09:29

Isolation of Intermediate Filament Proteins from Multiple Mouse Tissues to Study Aging-associated Post-translational Modifications

Published on: May 18, 2017

Changes in eyebrow position and shape with aging.

Evan Matros1, Jesus A Garcia, Michael J Yaremchuk

  • 1Boston, Mass. From the Division of Plastic Surgery, Department of Surgery, Massachusetts General Hospital and Harvard Medical School.

Plastic and Reconstructive Surgery
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

Aging paradoxically elevates eyebrows, contrary to other facial features. Surgical brow lifts focusing on the lateral brow offer more youthful, aesthetically pleasing results for the upper face.

Related Experiment Videos

Last Updated: Jun 18, 2026

Isolation of Intermediate Filament Proteins from Multiple Mouse Tissues to Study Aging-associated Post-translational Modifications
09:29

Isolation of Intermediate Filament Proteins from Multiple Mouse Tissues to Study Aging-associated Post-translational Modifications

Published on: May 18, 2017

Area of Science:

  • Plastic Surgery
  • Facial Aesthetics
  • Aging Research

Background:

  • Brow-lift surgery outcomes are debated due to a lack of objective aesthetic goals.
  • Previous studies suggest brow lifts can yield unappealing eyebrow shapes and positions.

Purpose of the Study:

  • To compare eyebrow shape and position in young and mature women.
  • To provide objective data for planning forehead rejuvenation procedures.

Main Methods:

  • Photographic analysis of eyebrow position in two age groups: 20-30 years (n=36) and 50-60 years (n=34).
  • Measurements taken from the medial canthi to three eyebrow margin points.
  • Exclusion criteria: prior surgery, plucked brows, botulinum toxin use.

Main Results:

  • Younger women's brows were 15.7mm (medial), 19.8mm (pupil), and 21.3mm (lateral) above the medial canthus.
  • Older women's brows were 19.1mm (medial), 22.4mm (pupil), and 22.4mm (lateral) above the medial canthus.
  • Eyebrows were significantly higher in older women at the medial and mid-brow points.

Conclusions:

  • Eyebrows paradoxically elevate with age, unlike other facial soft tissues.
  • Surgical elevation of the mid and medial brow may not produce youthful or aesthetically pleasing results.
  • Techniques selectively elevating the lateral brow are more likely to achieve facial rejuvenation.