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. Pronunciation
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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: Muscles of the upper arm We will first consider the following two muscle groups with opposing functions of flexion and extension: Biceps brachii The biceps brachii (BY-seps BRAY-kee-eye; 🔊 Listen) is the large two-headed muscle covering the anterior of the humerus. You
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Muscles of the Thorax
Learning Objectives By the end of this section, you will be able to: 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. Alternately, when you exhale, your chest falls because the thoracic cavity decreases in size. Breathing
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Muscles of the Shoulder and Back
Learning Objectives By the end of this section, you will be able to: We will consider the following four muscle groups: Pectoralis major         The pectoral major may colloquially be referred to as “pecs” due to it being the largest and most superficial muscle in the chest area. The pectoralis (PEK-tuh-RAH-liss; 🔊 Listen) major (from
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Muscles of the Head and Neck
Learning Objectives By the end of this section, you will be able to: We will consider the following three muscles: Instructions:You’ve learned the major bones in the last two labs—now it’s time to put that knowledge to work! Follow these steps as you explore each muscle: Masseter This cheek muscle has a superficial and
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Abdominal Muscles
Learning Objectives By the end of this section, you will be able to: The following four muscles are described from superficial to deep: 1. External oblique The external oblique (ek-STUR-nuhl oh-BLEEK; 🔊 Listen) is a broad, flat muscle that covers much of the lateral trunk. Its fibers run downwards and forwards (toward the midline)