Fundamentals of Anatomy and Physiology

210 Chapter 9

Frontalis

Masseter

Sternocleidomastoid

Deltoid

Pectoralis major

Serratus anterior

External oblique

Flexors of hand

and fingers

Sartorius^

Vastus

lateralis^

Quadriceps tendon

Patella

Patellar ligament

Tibialis anterior

Peroneus longus

Temporalis

Orbicularis oculi

Orbicularis oris

Trapezius

Biceps brachii

Rectus abdominis

Linea alba

Extensors of hand

Tensor fasciae latae

Adductors^

of thigh

Rectus femoris

Vastus medialis

Gastrocnemius

Soleus

Tibia

(^) ®
Learning
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Figure 9-7A The superficial muscles of the body (anterior
view).
In performing any given movement, such as bend-ing
the leg at the knee joint, the muscles performing the actual
movement are called the prime movers or agonists-.
Those muscles that will straighten the knee are the
antagonists-. The agonist or prime mover must relax for
the antagonists to perform their function and vice versa.
Synergists (SIN-er-jistz) are the muscles that -assist the
prime movers.
The Function and Location of
Selected Skeletal Muscles
The superficial muscles of the body are those that can be
found directly under the skin (Figure 9-7). Some parts of
the body, like the arms and legs, will have up to three dif-
ferent layers of muscles (superficial, middle, and deep
layers). Other areas will have only superficial muscles,