Lectures 10,11, 14, 16, 18, 19, 20 Flashcards
fascia definition
- if removed all other structures the fascia would show the image of the person
- A sheet or band of fibrous tissue such as lies deep to the skin and forms an investment for muscles and various other organs.
fascia is derived from
mesoderm
three basic elements of fascia
1) Cells (fibroblasts and macrophages)
2) Ground substance (embedded in a chiefly carbohydrate ground substance)
3) Fibers (interlacing protein fibers as of collagen).
continuity of fascia
Marked by uninterrupted extension in space, time, or sequence : continuing without intermission or recurring regularly after minute interruptions.
contiguity of fascia
- Being in actual contact : touching along a boundary or at a point.
- Touching or connected throughout in an unbroken sequence (contiguous row houses).
The continuous and contiguous properties of fascia defines the concept
of the body as a unified whole.
With respoect to fascia the body is NOT
simply groups of discrete regions or separated systems.
fascia is a sheet of CT that (3)
1) Compartmentalizes the body.
2) Envelops specific structures.
3) Segregates one area from another.
fascia function:
- supports and stabilizes the tissues it surrouned
- discipates force throughout body
- assists in control of motion–> has contractile properties
fascia composition is
colloid like (glue like)
to discipate force/energy fascia is organized…
along the same stress lines as the direction of force within the tissue.
fascia is controlled by:
1) Hormones (endocrine system)
2) Nerv`es of position (proprioception)
4 P’s of fascia
postural
protection
packagin
passageways
postural P of fascia
- assists with maintaining upright posture with dense supporting tissues
- limits and directs muscle motion
- guides contraction and motion of muscles
- distributes stress
protective P of fascia
- Sheaths, protects, supports nerves and blood vessels.
- All nerves perforate or are encompassed by fascia.
packaging P of fascia
- Some form of fascia surrounds every nerve, bone, muscle, and organ.
- Channels energy of muscles into a specific action while simultaneously preventing rupture and tearing.
- Gives shape and form to muscle groups.
passageway P of fascia
- Fascia forms planes and thus passageways between anatomic structures.
- Fascia provides fluid for lubrication, and movement of nutrients.
- Fascia keeps veins open and widens them
passageway function of fascia and cells of body
- since the fascia effects the immediate external environment ofeveryliving cell—> influence the metabolism of all cells
- different pressure or tension will alter nutriton and waste diffusion
changes in the fascia …
can alter or reduce ALL functions
major damage to function and structure of the body is when the ___ fascia is damaged
horizontal - the diaphragms of the body
wolffs law and fascia
- bone is increased where needed and resorbed where not needed
- bones and soft tissue deform depedning on the stresses–> the longer and the more force== the tissue cant regain previous elastic shape/function
calcium and bones and wolffs law
Ca is laid down along lines of stress = bony internal remodeling, bony spurs, joint immobility and calcified ligaments
layers of fascia
superficial
deep
subserious
superficial fascia
- Is attached to the undersurface of the skin.
- loosely knit–> skin can be moved over deeper structures
- contains: fat, vascular structures. nerve tissues
deep fascia
- Is tough, tight and compact.
- Contains a variety of different tissue types including loose connective, dense regular, and dense irregular.
- Compartmentalizes the body: Envelopes and separates muscles; Surrounds and separates internal organs; Contributes to the contour and function of the body.
- binds nerves, Bv and lymphatics
subserous fascia
- Lies innermost on the deep layer anywhere there is a body cavity.
- Is a loose areolar tissue covering of the visceral organs.
- The many small circulatory channels and fluid within this layer lubricate the surfaces of the internal viscera.
fascia response to stress
- nflammatory
- elastic deformation
- creep
- hysteresis
inflammatory changes
- Damaged tissue cells release substances that activate the inflammation process.
- Erythema (increased blood flow to the area).
- Local increase in capillary permeability (leakage of almost pure plasma into the area and clotting of the tissue fluid).
- leucocytes
- INGROWTH OF FIBROUS TISSUE
elsatic deformation
- Fascia’s intimate connection to muscle provides the opportunity for contraction and relaxation.
- Fascia has elasticity that allows it to retain its shape and respond to deformation (resists staying transformed).
- Elastic deformation is the ability of fascia to recover its original shape when the load is removed.
creep
- If a load is great and applied for a long period, fascia may not be able to recover its original size/shape resulting in plastic deformation.
- When subjected to an extension load and held constant, fascia has the capacity to “creep”.
- explains long term stresses on CT = loss of elasticity