How are skeletal muscles named?
Shape (eg. deltoid = triangle; trapezium = trapezoid) and relative size (eg. Maximus = largest, minimus = smallest, longus = long)
Direction of fibers or fascicles - eg. Rectus (fibers run straight), transversus and oblique (fibers run at angles to an imaginary defined axis) and ACTION (eg. flexor or extensor = muscles that flex or extend)
Location (eg. Bone or body region associated with the muscles) and number or origins (eg. biceps = 2 origins, triceps = 3 origins)
All of the above plus location of attachments (named according to point of origin or insertion)
What are the different arrangements of fascicles?
Circular and convergent
Parallel and fusiform
Unipennate, Bipennate, Multipennate
All of the above
What is a circular arrangement of fascicles?
Fascicles arranged in concentric rings (e.g., orbicularis oris)
Fascicles converge toward a single tendon insertion (e.g., pectoralis major)
Fascicles parallel to the long axis of a straplike muscle (e.g., sartorius)
Spindle-shaped muscles with parallel fibers (e.g., biceps brachii)
What is a convergent arrangement of fascicles?
Short fascicles attach obliquely to a central tendon running the length of the muscle (e.g., rectus femoris)
What is a parallel arrangement of fascicles?
What is a fusiform arrangement of fascicles?
What is a pennate arrangement of fascicles?
Which of these is a circular arrangement of fascicles?
Orbicularis oris (sphincter muscle that encircles the mouth)
Pectoralis major (large muscle of the chest)
Sartorius (flexing muscle in the anterior compartment of the thigh)
Biceps brachii (major flexor at the elbow)
Which of these is a convergent arrangement of fascicles?
Which of these is a parallel arrangement of fascicles?
Which of these is a fusiform arrangement of fascicles?
Which of these is a unipennate arrangement of fascicles?
Extensor digitorum longus (extends lateral four toes and dorsiflexes foot)
Rectus femoris (flexes the thigh at the hip joint and extends leg at the knee joint)
Deltoid (Muscle in shoulder joint and the major abductor of the arm)
Which of these is a bipennate arrangement of fascicles?
Which of these is a multipennate arrangement of fascicles?
Which arrangement of fascicles is which?
Label the muscles