Arrangement Of Human Skeletal Muscles

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See figures 5-1 and 5-2 for some of the skeletal muscles.

FRONTALIS

STERNOCLEIDOMASTOID

DELTOID

BICEPS BRACHII

EXTERNAL OBLIQUE

ILIOPSOAS

SARTORIUS

GASTROCNEMIUS

TIBIALIS ANTERIOR

FRONTALIS

DELTOID

STERNOCLEIDOMASTOID

BICEPS BRACHII

EXTERNAL OBLIQUE

ILIOPSOAS

SARTORIUS

GASTROCNEMIUS

TIBIALIS ANTERIOR

FLEXORS

QUADRICEPS FEMORIS

EXTENSORS

EXTENSOR TENDONS

Figure 5-1. Skeletal and facial muscles, anterior view.

ORBICULARIS OCULI ORBICULARIS ORIS

PECTORIALIS MAJOR SERRATUS ANTERIOR

RECTUS ABDOMINIS

FLEXORS

QUADRICEPS FEMORIS

EXTENSORS

EXTENSOR TENDONS

Figure 5-1. Skeletal and facial muscles, anterior view.

TRAPEZIUS

DELTOID

LATISSIMUS DORSI

EXTENSORS

GASTROCNEMIUS SOLEUS ACHILLE S TENDON

TRAPEZIUS

DELTOID

LATISSIMUS DORSI

EXTENSORS

GASTROCNEMIUS SOLEUS ACHILLE S TENDON

OCCIPITALIS

STERNOCLEIDOMASTOID

TRICEPS BRACH 11

GLUTEUS MAXIMUS HAMSTRINGS

Figure 5-2. Skeletal and facial muscles, posterior view.

OCCIPITALIS

STERNOCLEIDOMASTOID

TRICEPS BRACH 11

GLUTEUS MAXIMUS HAMSTRINGS

Figure 5-2. Skeletal and facial muscles, posterior view.

a. Trunk Musculature. The trunk musculature is arranged in two ways--longitudinal muscles and oblique muscles. Together, they:

(1) Maintain trunk posture.

(2) Move the parts of the trunk.

(3) Adjust the internal pressures of the trunk to perform certain functions such as breathing.

b. Limb Musculature. The limb musculature is arranged around the joints to produce the appropriate motions of the limbs. Elementary mechanics are described in the next section to help you to understand typical arrangements of limb musculature.

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