Skin ligaments
Retinacula cutis
Definition
Skin ligaments (Latin: retinacula cutis) are numerous, small, fibrous connective tissue bands that extend from the deep surface of the dermis to the underlying deep fascia, anchoring the skin to deeper structures throughout the body.
Structural Definition
Skin ligaments are complex fibrous strands that link the base of the dermis to the superficial fibers of the underlying deep fascia, traversing the subcutaneous (hypodermal) fat layer. They form an extensive peripheral network within the subcutaneous tissue and are composed of collagen and elastic fibers. The collagen fiber configuration of the dermis forms visible vertical tethers — the retinacula cutis — which also give rise to the troughs seen on the epidermal surface.
Distribution
Although traditionally described primarily in the face, hands, feet, and breast tissue, anatomical studies using plastination techniques and fluorescent confocal microscopy have demonstrated that skin ligaments are present over most of the body, including the limbs and trunk. Their morphology and density vary by region:
Head, neck, and upper trunk: Many skin ligaments anchor the skin to areas with underlying muscle movement.
Palms and soles (glabrous skin): The retinacula are thicker, preventing skin shearing during grip and weight-bearing.
Abdomen and buttocks: Irregular skin ligament patterns facilitate volume changes for adipose tissue storage.
Digits: Specialized cutaneous ligaments (Cleland's ligaments dorsally, Grayson's ligaments volarly) extend bilaterally between the phalanges and the finger dermis, anchoring the skin and preventing displacement during flexion.
Face: Well-defined retaining ligaments (e.g., zygomatic, mandibular, orbital, masseteric) delineate specific skin compartments and anchor the skin and SMAS to underlying bone and fascia.
Function
Skin ligaments serve several key roles:
Anchorage: They provide a flexible yet mechanically resistant attachment of skin to deep fascia, resisting multi-directional forces.
Movement regulation: The retinacular system determines the limits of skin movement and maintains the skin in a fixed relationship to the underlying skeleton during motion.
Form maintenance: They maintain morphologic features of the body surface (e.g., the inframammary fold, facial contours). Degeneration of these ligaments with aging, obesity, or disease leads to changes in form, including wrinkle deepening and skin laxity.
Protection: In the digits, they stabilize the neurovascular bundles and create gliding paths for extensor tendons.
References
