Unit 5 Muscular System Flashcards
Skeletal muscle identifying characteristics of each type of muscle and where in the body will you find it
-Attached to bones, responsible for voluntary movement
-Striated (striped appearance), multinucleated, voluntary control
-Arms, legs, back, face—any muscle used for movement.
Smooth muscle identifying characteristics of each type of muscle and where in the body will you find it
-Found in internal organs, responsible for involuntary movement
-Non-striated, single nucleus per cell, involuntary control
-Walls of blood vessels, digestive tract, respiratory passages, urinary bladder
Cardiac muscle identifying characteristics of each type of muscle and where in the body will you find it
-Found only in the heart, responsible for involuntary contraction of the heart
-Striated, branched, single or binucleated, contains intercalated discs for synchronized contraction, involuntary control
-Only in the heart
Muscle fiber is
One skeletal muscle
cell
Endomysium
Delicate areolar
sheath that wraps each muscle fiber
Fascicle
A group of endomysium-
covered muscle fibers
Perimysium
Coarse collagenic
membrane wrapped around a
fascicle
Skeletal muscle
A group of fascicles
Epimysium
Tough layer of dense
irregular CT wrapped around a
skeletal muscle
Insertion
Bone that moves when the skeletal
muscle contracts
Origin
Bone that does not move when the skeletal muscle contracts
Brachioradialis
Outside muscle of forearm
Brachioradialis Origin and Insertion
- Origin: Lateral supracondylar ridge at distal end of the humerus
- Insertion: Base of styloid process of radius
Vastus medialis
Frontal muscle of quad that sticks pocket out
Vastus medialis Origin and Insertion
- Origin: Line aspera of the femur
- Insertion: Tibial tuberosity of the tibia
Flexion
DECREASES the angle of a
joint and REDUCES distance
between origin and insertion
Extension
INCREASES the angle of a
joint and the distance
between origin and insertion
Abduction
Movement of a limb AWAY from
the midline (it gets abducted -
kidnapped!)
Adduction
Movement of a limb TOWARDS
the midline of the body
Rotation
Movement of a bone
around its longitudinal axis
Circumduction
Proximal end of a limb
remains stationary and the
distal end moves in a circle
(limb outlines a cone)
Pronation
Palm moves from facing anteriorly (upwards)
to facing posteriorly (downwards)
Supination
Palm moves from facing posteriorly (downwards) to facing anteriorly (upwards)
Inversion
Turning sole of foot MEDIALLY
