Textbook Question
A fascicle is a:
a. Muscle
b. Bundle of muscle fibers enclosed by a connective tissue sheath
c. Bundle of myofibrils
d. Group of myofilaments
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9. Muscle Tissue
Structure of a Skeletal Muscle
Problem L2.2
Textbook Question
The primary action of the biceps brachii muscle of the anterior arm is to flex the forearm at the elbow. However, when this muscle is inflamed, pain is felt in the shoulder. Explain this finding.
Verified step by step guidance1
Understand the anatomy of the biceps brachii muscle: The biceps brachii is a two-headed muscle located in the anterior compartment of the arm. It originates from two points in the shoulder region—the short head from the coracoid process of the scapula and the long head from the supraglenoid tubercle of the scapula.
Recognize the dual function of the biceps brachii: While its primary action is flexion of the forearm at the elbow, the biceps brachii also plays a role in stabilizing the shoulder joint due to its attachment points in the shoulder region.
Understand the concept of referred pain: Pain felt in one area of the body can originate from another area due to shared nerve pathways or interconnected structures. In this case, inflammation of the biceps brachii can irritate structures in the shoulder region, leading to pain perception in the shoulder.
Consider the role of inflammation: When the biceps brachii muscle becomes inflamed, the irritation can affect surrounding tissues, including the tendons and ligaments in the shoulder joint. This can lead to discomfort or pain in the shoulder area.
Relate the anatomical connection to the symptom: Since the long head of the biceps brachii passes through the shoulder joint and attaches to the supraglenoid tubercle, inflammation in the muscle or its tendon can directly impact the shoulder, causing pain in that region.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Biceps Brachii Function
The biceps brachii is a major muscle in the anterior arm responsible for flexing the forearm at the elbow and assisting in shoulder movements. It has two heads that originate from the shoulder and insert into the radius bone of the forearm, allowing it to play a crucial role in both elbow flexion and supination of the forearm.
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Referred Pain
Referred pain occurs when discomfort is perceived in a location different from the source of the pain. In the case of biceps brachii inflammation, the pain may be felt in the shoulder due to the shared nerve pathways and the anatomical proximity of the shoulder and elbow, leading to confusion in the brain about the actual source of the pain.
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Inflammation and Pain Response
Inflammation is the body's response to injury or irritation, characterized by swelling, redness, and pain. When the biceps brachii is inflamed, it can lead to increased sensitivity and pain not only at the site of inflammation but also in surrounding areas, such as the shoulder, due to the interconnected nature of muscle and nerve tissues.
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