Skeletal Muscles
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Technical Body Movement Terms
The muscles of the anterior compartment of the lower leg are generally responsible for dorsiflexion. The muscles of the posterior compartment of the lower leg are generally responsible for plantar flexion. The lateral and medial muscles in both compartments invert, evert, and rotate the foot.
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Muscles of the Lower Limb
Learning Objectives By the end of this section, you will be able to: Identify, locate, and describe the origin, insertion and function of the major upper and lower leg muscles. Upper Leg Muscles We will consider the following two muscle groups with opposing functions: When the hamstring muscle group acts as the agonist (primary mover),…
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Muscles of the Upper Limb and Forearm
Learning Objectives By the end of this section, you will be able to: Identify, locate, and describe the origin, insertion and function of the major upper arm and and forearm muscles. Muscles of the upper arm We will first consider the following two muscle groups with opposing functions of flexion and extension: Biceps brachii This…
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Muscles of the Thorax
Learning Objectives By the end of this section, you will be able to: Identify, locate, and describe the origin, insertion and function of the muscles of the thorax. The muscles of the chest serve to facilitate breathing by changing the size of the thoracic cavity. When you inhale, your chest rises because the cavity expands.…
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Muscles of the Shoulder and Back
Learning Objectives By the end of this section, you will be able to: Identify, locate, and describe the origin, insertion and function of four muscles of the shoulder and back. We will consider the following four muscle groups: Pectoralis major The pectoral major may colloquially be referred to as “pecs” due to it being…
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Muscles of the Head and Neck
Learning Objectives By the end of this section, you will be able to: Identify, locate, and describe the origin, insertion and function of three muscles in the head and neck. We will consider the following three muscles: Masseter This cheek muscle has a superficial and a deep part and is named after its function.…
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Abdominal Muscles
Learning Objectives By the end of this section, you will be able to: Identify, locate, and describe the origin, insertion and function of four abdominal muscles. The following four muscles are described from superficial to deep: 1. External oblique This broad, flat muscle covers much of the lateral trunk. Its fibers run downwards and…