Podcast
Questions and Answers
A patient has difficulty extending their knee. If a doctor suspects a nerve issue, which aspect of muscle function would be most relevant to investigate?
A patient has difficulty extending their knee. If a doctor suspects a nerve issue, which aspect of muscle function would be most relevant to investigate?
During a bicep curl, which attachment point of the bicep brachii would be considered the insertion?
During a bicep curl, which attachment point of the bicep brachii would be considered the insertion?
A physical therapist is designing an exercise program for a patient recovering from a shoulder injury. The program focuses on muscles that abduct the arm at the shoulder joint. What muscle characteristic is the therapist primarily considering?
A physical therapist is designing an exercise program for a patient recovering from a shoulder injury. The program focuses on muscles that abduct the arm at the shoulder joint. What muscle characteristic is the therapist primarily considering?
A weightlifter is performing a bench press. At the bottom of the movement, the pectoralis major is lengthening. What action is occurring at the shoulder joint during this phase?
A weightlifter is performing a bench press. At the bottom of the movement, the pectoralis major is lengthening. What action is occurring at the shoulder joint during this phase?
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Following a spinal cord injury, a patient experiences paralysis in their lower leg. While the muscles themselves are intact, they are unable to contract them voluntarily. Which aspect of the muscle function is most directly affected by the spinal cord injury?
Following a spinal cord injury, a patient experiences paralysis in their lower leg. While the muscles themselves are intact, they are unable to contract them voluntarily. Which aspect of the muscle function is most directly affected by the spinal cord injury?
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Flashcards
Origin
Origin
The site where a muscle attaches to the least moving bone.
Insertion
Insertion
The site where a muscle attaches to the bone that moves the most.
Action
Action
The movement produced by a muscle during contraction.
Nerve Supply
Nerve Supply
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Muscle Actions
Muscle Actions
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Upper trapezius origin
Upper trapezius origin
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Study Notes
Origin
- Origin refers to the attachment site of a muscle to the bone that moves least during contraction.
- Located on proximal or more central bone.
- Described in terms of specific bony landmarks or regions (e.g., "greater trochanter of the femur," "iliac crest").
Insertion
- Insertion refers to the muscle attachment to the bone that moves the most when the muscle contracts.
- Located on the distal or more peripheral bone.
- Usually descriptive of a bony landmark, like processes on the distal bone.
Action
- Action describes the movement(s) the muscle produces when it contracts.
- Often, but not always, named for the joint(s) crossed.
- Examples include flexion, extension, abduction, adduction, internal rotation, external rotation, pronation, supination.
- Specifying the joint is crucial (e.g., "flexion of the elbow" vs. "flexion of the knee").
- A muscle can have multiple actions, sometimes assisting one primary action.
Nerve Supply
- Nerve supply refers to the specific nerve stimulating the muscle contraction.
- Knowing the nerve is crucial for understanding potential nerve trauma effects.
- Nerves are named and their locations are also important.
- Crucial for understanding motor command pathways to muscles.
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Description
This lesson defines the origin, insertion, and action of muscles. Origin refers to the muscle attachment site on the bone that moves least when the muscle contracts, while insertion is the attachment on the bone that moves the most. Action describes the movement produced when the muscle contracts.
