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Subcutis - Structure, Function and Diseases
The subcutis is the deepest layer of the skin, composed mainly of fatty tissue. It provides thermal insulation, energy storage, and mechanical protection for the body.
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The subcutis is the deepest layer of the skin, composed mainly of fatty tissue. It provides thermal insulation, energy storage, and mechanical protection for the body.
What is the Subcutis?
The subcutis (also known as the subcutaneous tissue or hypodermis) is the deepest of the three layers of human skin. It lies beneath the dermis (middle skin layer) and connects the skin to the underlying muscles and bones. The subcutis consists primarily of loose connective tissue and adipose tissue (fat), which is organized into lobules separated by fibrous septa.
Structure of the Subcutis
The subcutis is composed of several tissue components:
- Fat cells (adipocytes): These make up the bulk of the subcutis and store energy in the form of triglycerides.
- Connective tissue fibers: Collagen and elastic fibers provide structural support and flexibility to the tissue.
- Blood and lymphatic vessels: A dense network supplies the overlying skin layers with nutrients and oxygen.
- Nerve fibers: Sensory nerves in the subcutis allow the perception of deep pressure and touch.
- Hair follicle roots and sweat gland ducts: These structures extend partially into the subcutaneous layer.
Functions of the Subcutis
The subcutis fulfills several vital functions for the body:
- Thermal insulation: The fat layer reduces heat loss and protects the body from cold temperatures.
- Energy storage: Fat is stored as a long-term energy reserve and mobilized when needed.
- Mechanical protection: The subcutis acts as a cushion or shock absorber, protecting deeper structures such as muscles, bones, and organs from external forces.
- Skin anchoring: Fibrous bands loosely connect the skin to underlying muscle and bone, allowing the skin to move and slide.
- Hormone production: Fat cells produce hormones such as leptin, which plays a role in regulating hunger and body weight.
Clinical Relevance
The subcutis is medically relevant in many areas of healthcare:
Subcutaneous Injections
Many medications are administered directly into the subcutaneous tissue, for example insulin for diabetes mellitus or heparin for anticoagulation therapy. The tissue allows for slow and steady absorption of the drug into the bloodstream.
Diseases Affecting the Subcutis
Various conditions can affect the subcutaneous layer:
- Lipoma: A benign overgrowth of fatty tissue felt as a soft lump under the skin.
- Panniculitis: Inflammation of the subcutaneous fat, presenting with painful nodules or swelling.
- Lipohypertrophy and lipoatrophy: Changes in fat tissue distribution, commonly seen as a side effect of repeated insulin injections.
- Cellulitis: A bacterial skin infection that can spread into the subcutaneous tissue and deeper layers.
- Edema: Fluid accumulation in the subcutaneous tissue, as seen in heart failure or lymphatic obstruction.
Relevance in Surgery and Aesthetics
The subcutis is important in surgical wound closure and cosmetic procedures such as liposuction (fat removal) and lipofilling (autologous fat transfer).
Diagnosis
Several imaging methods are used to assess the subcutis:
- Ultrasound (sonography): Often the first-line imaging method for visualizing changes in the subcutaneous tissue.
- MRI (magnetic resonance imaging): Provides detailed visualization of fatty tissue and soft tissue structures.
- Biopsy: Tissue sampling for histological examination in cases of unclear findings or suspected tumor tissue.
References
- Marks, J.G.; Miller, J.J. - Lookingbill and Marks' Principles of Dermatology. Elsevier, 6th edition (2019).
- Ross, M.H.; Pawlina, W. - Histology: A Text and Atlas. Wolters Kluwer, 8th edition (2020).
- World Health Organization (WHO) - Diabetes: Insulin administration guidelines. WHO Technical Report (2023). Available at: https://www.who.int
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