2. OTHER TISSUES ASSOCIATED WITH
BONES, JOINTS AND MUSCLES…
Fascia
another form of fibrous connective
tissue of the body that covers, connects, or
supports other tissues
a band or sheet of connective tissue,
primarily collagen, beneath the skin that
attaches, stabilizes, encloses, and
separates muscles and other internal organ
4. OTHER TISSUES ASSOCIATED WITH
BONES, JOINTS AND MUSCLES…
Bursa
fluid-filled, saclike that functions as a
gliding surface to reduce friction between
moving tissues of the body
a saclike structure that contains bursa
fluid and protects muscle, tendon,
ligament, and other tissues as they cross
the bony prominences
7. MOTOR UNIT
A motor unit is defined as a motor nerve
and all the muscle fibers it supplies
The structural parts of the motor unit are
the motor nerve and the muscle fiber
All the motor units together are referred to
as the body’s neuromuscular system
8. MOTOR UNIT
A nerve impulse travels from the spinal
cord (or brain) to a dendrite of a spinal
nerve, from the dendrite to the nerve’s cell
body, and from the cell body over the
nerve’s axon to the axon’s end brushes
(motor end plate), where a chemical is
released as the synapse
9.
10. MOTOR UNIT
As the impulse passes from nerve to
muscle, calcium is released from the
sarcoplasmic reticulum and transverse
tubules within the muscle fibers, two
structures closely allied with the actin and
myosin protein filaments
The collagen fibers are oriented in a wavy pattern parallel to the direction of pull
If ligaments join one bone to bone, tendons join muscle to bone, fascia surround muscles and other structures
The fascia from one muscle then connects with the fascia from other muscles, and forms a network of connective tissue that integrates from the top of your head to the tips of your toes
The fluid inside the bursa looks and feel the same as the egg white
We have now observed the bones, the ligaments that connect the bones to form articulations, the muscles that cross joints and create movement, the nerves that innervate the muscles and the blood vessels that supply all the these structures.
The calcium release causes the myosin cross bridges to wiggle or swivel in such a fusion that they contact the actin filaments surrounding them and cause the actin to move toward the center of the sacromere
