Podcast
Questions and Answers
Which muscle primarily acts to laterally rotate the humerus at the shoulder?
Which muscle primarily acts to laterally rotate the humerus at the shoulder?
What is the primary action of the Serratus anterior muscle?
What is the primary action of the Serratus anterior muscle?
Which muscle originates from the medial epicondyle of the humerus and is responsible for flexing the wrist?
Which muscle originates from the medial epicondyle of the humerus and is responsible for flexing the wrist?
Which of the following muscles is primarily involved in the flexion of the elbow?
Which of the following muscles is primarily involved in the flexion of the elbow?
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What muscle works to extend the knee while also flexing the hip?
What muscle works to extend the knee while also flexing the hip?
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Which muscle originates from the iliac crest and is primarily responsible for stabilizing and abducting the leg at the hip?
Which muscle originates from the iliac crest and is primarily responsible for stabilizing and abducting the leg at the hip?
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The primary action of the Diaphragm is to facilitate which process during inhalation?
The primary action of the Diaphragm is to facilitate which process during inhalation?
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What is the action of the External intercostals during breathing?
What is the action of the External intercostals during breathing?
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Which of the following muscles are primarily involved in knee extension?
Which of the following muscles are primarily involved in knee extension?
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Which muscle originates from the pubis and acts to flex the hip and adduct the thigh?
Which muscle originates from the pubis and acts to flex the hip and adduct the thigh?
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Which of the following muscles is NOT primarily involved in the movement of the elbow?
Which of the following muscles is NOT primarily involved in the movement of the elbow?
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Which muscle acts to dorsiflex the foot at the ankle?
Which muscle acts to dorsiflex the foot at the ankle?
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Which muscle primarily extends the lumbar region of the vertebral column?
Which muscle primarily extends the lumbar region of the vertebral column?
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What is the primary action of the orbicularis oculi muscle?
What is the primary action of the orbicularis oculi muscle?
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Which muscle is primarily responsible for elevating the mandible?
Which muscle is primarily responsible for elevating the mandible?
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Which muscle originates from the zygomatic arch?
Which muscle originates from the zygomatic arch?
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In which functional context would the platysma muscle be primarily active?
In which functional context would the platysma muscle be primarily active?
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Which muscle action involves cocks the head to one side?
Which muscle action involves cocks the head to one side?
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Which of the following muscles provides flexion and medial rotation of the humerus at the shoulder?
Which of the following muscles provides flexion and medial rotation of the humerus at the shoulder?
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What role do the rotator cuff muscles serve?
What role do the rotator cuff muscles serve?
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Which muscle originates from the epicranial aponeurosis?
Which muscle originates from the epicranial aponeurosis?
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Identify the muscle primarily involved in the action of abducting the humerus at the shoulder.
Identify the muscle primarily involved in the action of abducting the humerus at the shoulder.
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Which of the following muscles acts on the neck to flex it when both sides contract?
Which of the following muscles acts on the neck to flex it when both sides contract?
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The insertion of the subscapularis muscle is located at which of the following?
The insertion of the subscapularis muscle is located at which of the following?
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Which action does the deltoid (posterior) muscle facilitate?
Which action does the deltoid (posterior) muscle facilitate?
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Which structure is NOT a part of the origin for the temporalis muscle?
Which structure is NOT a part of the origin for the temporalis muscle?
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What is a notable action of the zygomaticus major?
What is a notable action of the zygomaticus major?
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Study Notes
Muscles of Facial Expression
- Orbicularis oculi: Closes eyes, lowers eyebrows, originates from the frontal bone and maxilla, inserts into the eyelid.
- Orbicularis oris: Closes lips, purses, protrudes, originates from the maxilla and mandible, inserts into the skin and muscle around the mouth.
- Zygomaticus major: Raises corners of mouth, creates a smile, originates from the zygomatic bone, inserts into the skin and muscle at the corner of the mouth.
- Buccinator: Compresses cheeks, helps with whistling and sucking, originates from the mandible and maxilla molar regions, inserts into the orbicularis oris.
- Frontalis: Raises eyebrows, originates from the epicranial aponeurosis, inserts into the skin of the eyebrows.
Muscles that act on the Jaw
- Masseter: Elevates mandible during chewing, originates from the zygomatic arch and bone, inserts into the mandible ramus and angle.
- Temporalis: Elevates mandible, originates from temporal, frontal, and parietal bones, inserts into the coronoid process of the mandible.
- Platysma: Pulls lower lip down, depresses mandible (opening mouth), originates from the pectoralis muscle, inserts into the mandible and skin of the lower face.
Muscles that act on the Neck
- Sternocleidomastoid: Flexes neck, cocks head to one side when contracted unilaterally, originates from the manubrium of the sternum and clavicle, inserts into the mastoid process of the temporal bone.
- Splenius capitis: Extends neck, cocks head to the side when contracted unilaterally, originates from C7 to T3 vertebrae, inserts into the nuchal line and mastoid process.
Muscles that act on the Shoulder
- Deltoid (anterior): Flexes and medially rotates humerus, originates from the clavicle, inserts into the deltoid tuberosity of the humerus.
- Deltoid (middle): Abducts humerus (raises arm to the side), originates from the acromion, inserts into the deltoid tuberosity of the humerus.
- Deltoid (posterior): Extends and laterally rotates the humerus, originates from the scapular spine, inserts into the deltoid tuberosity of the humerus.
- Pectoralis major: Flexes, adducts, and medially rotates the humerus, originates from the sternum, ribs 7, and the medial half of the clavicle, inserts into the intertubercular groove of the humerus.
- Latissimus dorsi: Extends, adducts, and medially rotates the humerus, originates from T7 to L5, ribs 10 to 12, and the iliac crest, inserts into the intertubercular groove of the humerus.
Rotator Cuff Muscles
- Subscapularis: Medially rotates the humerus, originates from the subscapular fossa of the scapula, inserts into the lesser tubercle of the humerus.
- All rotator cuff muscles help to keep the head of the humerus stable in the glenoid fossa.
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Description
Explore the intricate details of the muscles involved in facial expressions and jaw movement. This quiz covers key anatomical structures, their origins, insertions, and functions. Test your knowledge on the orbicularis oculi, masseter, and more!
