Questions and Answers
Which of the following muscles are involved in facial expression?
What is the action of the Orbicularis oculi muscle?
What nerve innervates the Buccinator muscle?
Facial nerve
The muscle responsible for elevating the upper eyelids is the ______.
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Which muscle assists in turning the head from side to side?
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Which nerve innervates the Trapezius muscle?
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What are the three divisions of the Trapezius muscle?
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The Latissimus dorsi muscle is located in the trunk.
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Which muscle is NOT part of the main muscles of the back?
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Match the following muscles to their actions:
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Study Notes
Muscular System Overview
- Identifying various muscle groups is a key learning outcome, including muscles of the face, neck, trunk, back, abdominal wall, thorax, pelvic floor, shoulder & upper limb, and hip & lower limb.
Muscles of the Face
- Facial muscles are primarily responsible for expressions and movement of the lower jaw.
- Muscles of facial expression include:
- Occipitofrontalis: Actions include drawing the scalp anteriorly and raising eyebrows.
- Orbicularis Oris: Encircles the mouth, closing lips and shaping during speech.
- Levator Palpebrae Superioris: Elevates the upper eyelid to open eyes.
- Buccinator: Presses cheeks against teeth, aids in chewing.
- Orbicularis Oculi: Closes the eyes.
Muscles of the Neck
- Key muscles include:
- Sternocleidomastoid: Assists in head rotation and functions as an accessory muscle for breathing.
- Trapezius: A large muscle covering shoulder and neck, involved in head movement and scapular control.
Muscles of the Trunk
- Trunk muscles stabilize the link between appendicular and axial skeletons and facilitate shoulder and upper arm movement.
- Divided into:
- Muscles of the Back: Include trapezius, latissimus dorsi, and others crucial for posture and movement.
- Muscles of the Abdominal Wall: Support and protect internal organs.
- Muscles of the Thorax: Assist in respiration.
Muscles of the Back
- Posterior abdominal wall comprises six major muscles:
- Trapezius: Originates from skull and vertebrae, inserts on clavicle and scapula; pulls head back and stabilizes shoulders.
- Latissimus Dorsi: Originates from iliac crest and lumbar vertebra; involved in adduction and extension of the arm.
- Teres Major: Assists in shoulder movements.
- Quadratus Lumborum: Stabilizes pelvis and lower back.
- Sacrospinalis: Supports the vertebral column and posture.
Key Functions and Nervous Supply
- Muscles have specific origins and insertions that define their movements.
- Innervation primarily by facial nerve for facial muscles; sternocleidomastoid and trapezius are innervated by accessory and cervical spinal nerves, aiding in motor control and movement.
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Description
Test your knowledge of the muscular system, focusing on various muscle groups including those of the face, neck, trunk, and limbs. This quiz will cover important functions and characteristics of key muscles to enhance your understanding of human anatomy.
