Podcast
Questions and Answers
Which muscle rotates the head?
Which muscle rotates the head?
- Trapezius
- Sternomastoid (correct)
- Deltoid
- Masseter
Which muscle is a common site for intramuscular injections?
Which muscle is a common site for intramuscular injections?
- Triceps
- Pectoralis major
- Deltoid (correct)
- Biceps
The hamstring is located on which part of the body?
The hamstring is located on which part of the body?
- Shoulder
- Forearm
- Front of thigh
- Back of thigh (correct)
Which muscle group is located on the front of the thigh?
Which muscle group is located on the front of the thigh?
Which of the following is a muscle of the shoulder?
Which of the following is a muscle of the shoulder?
Which of the following muscles is in the gluteal region?
Which of the following muscles is in the gluteal region?
Which muscles are located between the ribs and aid in respiration?
Which muscles are located between the ribs and aid in respiration?
Which muscle is the main respiratory muscle that separates the thoracic and abdominal cavities?
Which muscle is the main respiratory muscle that separates the thoracic and abdominal cavities?
Which type of muscle is attached to bones?
Which type of muscle is attached to bones?
Which vessel does NOT have an opening in the diaphragm?
Which vessel does NOT have an opening in the diaphragm?
Which action is performed by muscles of the anterior abdominal wall?
Which action is performed by muscles of the anterior abdominal wall?
Which type of muscle is responsible for involuntary movements?
Which type of muscle is responsible for involuntary movements?
Which muscle type lacks striations?
Which muscle type lacks striations?
Which nerve type controls skeletal muscles?
Which nerve type controls skeletal muscles?
Which muscle type is multinucleated?
Which muscle type is multinucleated?
Where are smooth muscles typically found?
Where are smooth muscles typically found?
What is the primary site of cardiac muscle?
What is the primary site of cardiac muscle?
Approximately what percentage of total body mass do skeletal muscles form?
Approximately what percentage of total body mass do skeletal muscles form?
What connects muscle to bone?
What connects muscle to bone?
Which function is NOT a primary function of muscles?
Which function is NOT a primary function of muscles?
Flashcards
Skeletal Muscle
Skeletal Muscle
Attached to bones, voluntary contraction, striated, somatic nerve supply, multinucleated cells.
Smooth Muscle
Smooth Muscle
Found in blood vessel walls & viscera, involuntary contraction, non-striated, autonomic nerve supply, spindle-shaped cells with a single nucleus.
Cardiac Muscle
Cardiac Muscle
Located in the heart's myocardium, involuntary contraction, striated, autonomic nerve supply, cells with a single nucleus.
Muscle Origin
Muscle Origin
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Muscle Insertion
Muscle Insertion
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Facial Expression Muscles
Facial Expression Muscles
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Muscles of Mastication
Muscles of Mastication
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Larynx/Pharynx Muscles
Larynx/Pharynx Muscles
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Nerves that control Skeletal Muscles
Nerves that control Skeletal Muscles
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Nerves that control Smooth and Cardiac Muscles
Nerves that control Smooth and Cardiac Muscles
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Sternomastoid Action
Sternomastoid Action
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Deltoid Muscle
Deltoid Muscle
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Pectoralis Major
Pectoralis Major
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Triceps
Triceps
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Biceps
Biceps
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Forearm Flexors
Forearm Flexors
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Forearm Extensors
Forearm Extensors
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Gluteus Maximus
Gluteus Maximus
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Hamstrings
Hamstrings
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Diaphragm Muscle
Diaphragm Muscle
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Study Notes
- Muscular System is categorized into three types: cardiac, skeletal, and smooth muscles.
Skeletal Muscles
- Attached to the skeleton, mainly bones
- Contraction is voluntary
- Striations are present
- Nerve supply comes from somatic nerves
- Muscle cells (fibers) are multinucleated
Smooth Muscles
- Found in the walls of blood vessels and viscera
- Contraction is involuntary
- Striations are absent
- Nerve supply is from the autonomic nervous system
- Muscle cells are spindle-shaped with a single nucleus
Cardiac Muscles
- Located in the myocardium of the heart
- Contraction is involuntary
- Striations are present
- Nerve supply is from the autonomic nervous system
- Muscle cells have a single nucleus
Skeletal Muscle Features
- Constitute about 40-50% of total body mass
- Arise from an origin and terminate at an insertion
- Origin is a fleshy mass, and the insertion is a cord-like structure called a tendon
Skeletal Muscle Function
- Produce movement
- Maintain posture
- Stabilize joints
- Generate heat
Muscle Groups: Head and Neck
- Muscles of facial expression
- Muscles of mastication (temporalis and masseter)
- Muscles of the tongue, pharynx, and larynx
Muscle Group Examples
- Sternomastoid muscle rotates the head
- Trapezius muscle is located in the shoulder region
Other Muscle Groups
- Muscles of the shoulder include the deltoid muscle, commonly used for intramuscular injections
- Muscles of the arm and chest include the triceps, biceps, pectoralis major
- Muscles of the forearm include flexors and extensors
Muscle Groups: Gluteal Region and Thigh
- Muscles of the gluteal region include the gluteus maximus, a site for intramuscular injections
- Hamstrings are muscles from the back of the thigh
- Muscles on the front of the thigh include quadriceps, while the medial side contains adductors
Muscles of the Leg
- Includes the calf muscles
- Important site of deep venous thrombosis
Muscles of the Thoracic Wall
- Intercostal muscles are respiratory muscles that lie between the ribs
Muscles of the Anterior Abdominal Wall
- Allow protection of the abdominal contents and movements of the trunk
Diaphragm
- Located between the thoracic and abdominal cavities
- Primary respiratory muscle attached to the sternum, ribs, and lumbar vertebrae
- Has three major openings for the aorta, inferior vena cava (IVC), and esophagus
Muscles of the Pelvis
- Attach to the hip bones, sacrum, and coccyx
- Support the pelvic viscera
- More critical in females due to their role in labor
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Description
The muscular system consists of cardiac, skeletal, and smooth muscles. Skeletal muscles attach to bones and allow for voluntary movement. Smooth muscles are found in blood vessels and viscera, while cardiac muscles are in the heart.
