HP 2306 Chapter Notes - Chapter 4: Tendon Sheath, Synovial Joint, Synovial Fluid

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Unit 1 Chapter 4 : Fascia
Section 4.4 Tendons and Ligaments
- Tendon : connects a muscle to a bone
o The fascia around and through the muscle continues into the tendon, so there is no separation
between two
o Muscle tissue just ‘runs out’ at the myotendinous junction and the fascia continues
o A tendon’s shape is round and cord=like
o Aponeurosis : the shape of a tendon is broad and flat
o Tendons and aponeurosis are identical in their tissue makeup, but differ in shape
o Functions to transmit the pulling force of a muscle to its bony attachment, creating movement
o A few elastin fibers are present
- Ligament : connects a bone to a bone
o A ligament can attach any two structures (except a muscle and a bone) to each other
o Ligaments are passive structures until the bones are pulled into a configuration where the ligament
is tightened to prevent the bones from going ‘too far’ and damaging the bones, tendon, or joint
o Are tightened by nearby muscles and actively participate in joint stabilization through the entire
range of movement
Very few ligaments are ‘true ligament’s in which they are independent of muscle tension
o Functions to create stability at a joint by holding the bones of the joint together to prevent excess or
damaging movement
o Very in the proportion of elastin and collagen fibers depending on the location and demand
- Both tendons and ligaments are types of dense fibrous connective tissue composed of many collagen fibers
packed tightly together and glued with a minimum of highly viscous ground substance
o Very few cells are present
o Fibroblasts are present cells, create the fibrillar threads of collagen
- Being made up nearly entirely of collagen fibers gives tendons and
ligaments extremely strong tensile force (ability to withstand strong pulling
forces without damage or injury) needed in two situations
o Needed by a tendon when the muscle to which it is attached
contracts and pulls on it
o Needed by tendons and ligaments when they are stretched and
pulled because the joint that they cross is moved in the opposite direction
- Both tendons and ligaments have poor blood supply and do not heal quickly after an injury because the
dense collagen fibers tightly packed together leaves little space for the blood vessels
- Tendinitis : also called tendonitis, inflammation caused from the tearing of a tendon
- Sprain : the tearing of a ligament
o May also refer to the tearing of the fibrous capsule of a synovial joint
- Strain : the tearing of a muscle
Section 4.5 Bursae and Tendon Sheaths
- Bursae and tendon sheaths are located in regions of the body
where the friction between two structures against each other
needs to be minimized and lubricated
o Friction causes the buildup of heat in which excessive
heat can cause damage and inflame the tissue
- Bursa : a flattened sac of synovial membrane that contains a film
of synovial fluid within it
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