Naming the Muscles Location Function Shape Fiber direction

Naming the Muscles • Location • Function • Shape • Fiber direction • Number of heads/divisions • Points of attachment • Muscle size

Location examples • Tibialis anterior • Rectus femoris

Function examples • Pronator quadratus

Shape examples • Trapezius • Deltoid

Muscle Fiber Arrangement ___________ ______

Muscle Attachment Does NOT move when muscle contracts hen w ove racts m t s Doe cle con mus

Location Function Frontalis Frontal bone Abductor Moves part away from body Femoris Femur Adductor Moves part toward body Gluteus Posterior of hip/thigh Depressor Lowers a part Oculi Eye Extensor Extends a part Oris Mouth Flexor Flexes a part Radialis Radius Levator Elevates a part Ulnaris Ulna Rotator Rotates a part Brachialis Arm Shape Fiber Direction Oblique Diagonal to midline Deltoid Shaped like delta ∆ Rectus Parallel to midline Orbicularis Circular Sphincter Circling an opening Platy Flattened; platelike Transversus Right angle to midline Quadratus Square Rhomboideus Diamond-shaped Trapezius Trapezoidal

Number of divisions Bicep Two heads Tricep Three heads Quadricep Four heads Size Brevis Short Longus Long Magnus Large Maximus Largest Medius Moderately sized Minimus Smaller

Upper Leg Deep muscle Vastus intermedius Biceps femoris Quadricep Femoris Semimembranosus Semitendinosus

Classification of Muscle Group Actions • Agonist (Prime Mover) • Muscle most responsible for movement • Antagonist • Opposes prime mover • Provides precision and control during prime mover contraction • Relaxes when prime mover contracts • Synergist • Aid prime mover • Contract at same time as prime mover