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Questions and Answers
What is the primary action of the Rectus abdominis muscle?
What is the primary action of the Rectus abdominis muscle?
Which muscle is primarily involved in the lateral flexion of the trunk?
Which muscle is primarily involved in the lateral flexion of the trunk?
What is a key function of the Gluteus medius muscle?
What is a key function of the Gluteus medius muscle?
What is the primary action of the sartorius muscle?
What is the primary action of the sartorius muscle?
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Which muscle assists in hip abduction and affects knee flexion?
Which muscle assists in hip abduction and affects knee flexion?
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The primary action of Psoas major is related to which of the following movements?
The primary action of Psoas major is related to which of the following movements?
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Which of the following statements is true regarding the quadriceps muscle group?
Which of the following statements is true regarding the quadriceps muscle group?
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What is the main function of the biceps femoris within the hamstrings group?
What is the main function of the biceps femoris within the hamstrings group?
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Which action is NOT performed by the gastrocnemius muscle?
Which action is NOT performed by the gastrocnemius muscle?
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Which muscle is responsible for moving the foot side to side?
Which muscle is responsible for moving the foot side to side?
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What is the primary action of the Pectoralis major muscle?
What is the primary action of the Pectoralis major muscle?
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Which muscle acts as a prime mover for forearm flexion?
Which muscle acts as a prime mover for forearm flexion?
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What is the function of the Teres major muscle?
What is the function of the Teres major muscle?
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What action is performed by the Triceps brachii muscle?
What action is performed by the Triceps brachii muscle?
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Which muscles are primarily responsible for flexing the wrist and fingers?
Which muscles are primarily responsible for flexing the wrist and fingers?
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What is the primary role of the Supinator muscle?
What is the primary role of the Supinator muscle?
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Which muscle group helps in extending the wrist?
Which muscle group helps in extending the wrist?
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What is the action of the Pronators muscle group?
What is the action of the Pronators muscle group?
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What is the primary action of the masseter muscle?
What is the primary action of the masseter muscle?
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Which muscle is responsible for raising the corners of the mouth?
Which muscle is responsible for raising the corners of the mouth?
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What action does the sternocleidomastoid muscle perform?
What action does the sternocleidomastoid muscle perform?
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The trapezius muscle is involved in which of the following actions?
The trapezius muscle is involved in which of the following actions?
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Which muscle works as a synergist for scapula protraction?
Which muscle works as a synergist for scapula protraction?
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What is one of the primary actions of the orbicularis oris muscle?
What is one of the primary actions of the orbicularis oris muscle?
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The rhomboideus major muscle primarily functions to:
The rhomboideus major muscle primarily functions to:
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Which muscle primarily downwardly rotates the scapula?
Which muscle primarily downwardly rotates the scapula?
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What action does the splenius capitis muscle perform?
What action does the splenius capitis muscle perform?
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Which muscle is responsible for blink and closure of the eye?
Which muscle is responsible for blink and closure of the eye?
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Study Notes
Muscles of Facial Expression
- Frontalis: Raises eyebrows
- Temporalis: Closes jaw, aids in chewing
- Orbicularis oculi: Blinks and closes eyes
- Masseter: Closes jaw, aids in chewing
- Orbicularis oris: Closes/protrudes lips
- Zygomaticus: Raises corners of mouth
- Platysma: Pulls corners of mouth inferiorly
Muscles That Move the Head
- Sternocleidomastoid: Flexes neck, rotates head
- Splenius capitis: Bilateral contraction, unilateral contraction
- Semispinalis capitis: Bilateral contraction, unilateral contraction
Muscles That Move the Pectoral Girdle
- Trapezius: Elevates, retracts, and rotates the scapula; extends and laterally flexes the head and neck; maintains and adjusts posture; acts as both an antagonist and synergist
- Example of action: shoulder shrugs
Muscles That Move the Pectoral Girdle (Specific)
- Pectoralis minor: Protracts, and downwardly rotates the scapula; depresses the scapula
- Example of action: Chest dips
- Serratus anterior: Upwardly rotates the scapula; stabilizes the scapula against the ribcage
Muscles That Move the Pectoral Girdle (Specific)
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Rhomboideus major: Retracts and elevates the scapula; rotates the scapula downward; retracts the pectoral girdle; stabilizes the scapula
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Example of action: Face pulls
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Levator scapulae: Elevates the scapula; rotates the glenoid cavity downward; extends and flexes the neck;
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Example of action: Shoulder shrugs
Muscles That Move the Arm
- Pectoralis major: Medially rotates arm, adductor
- Teres major: Extends/adducts humerus, rotates arm medially
- Teres minor and Infraspinatus: Rotates arm laterally, abductor
- Latissimus dorsi: Extends and adducts arm; rotates humerus inwardly; pulls shoulder downward and posteriorly; adductor and extensor
Muscles That Move the Forearm
- Biceps brachii: Prime mover for forearm flexion/movement for elbow
- Brachialis: Synergist with biceps brachii to flex and move the forearm
- Brachioradialis: Synergist with biceps brachii, moves the forearm
- Triceps brachii: Extends elbow
- Supinator: Rotates the radius laterally at the proximal radioulnar joint
- Pronators: Rotational movement of the forearm that results in the palm facing posteriorly
Muscles That Move the Wrist, Hand, and Fingers
- Flexors (carpi radialis, carpi ulnaris, digitorum): Flexes wrist and abducts hand
- Extensors (carpi radialis longus, brevis, carpi ulnaris, digitorum): Extend wrist and abducts hand
Muscles of the Abdominal Wall
- Rectus abdominis: Allows movement of the body between rib cage and pelvis in a curling/up and down motion; keeps upper body upright
Muscles That Move the Thigh (Anterior and Posterior)
- Psoas major and Iliacus: Flexion, rotation of thigh, hip
Muscles That Move the Thigh (Anterior and Posterior) (Specific)
- Gluteus maximus: Simultaneous contraction of psoas major and powerful flexion of the thigh at the hip joint
- Gluteus medius and minimus: Abduct thigh, steadies pelvis during walking; moves leg away from midline
- Tensor fasciae latae: Assists in knee flexion and lateral rotation through attachment of IT band to tibia
- Gracilis: Assists with hip abduction, knee flexion, internal rotation.
- Adductor longus and magnus: Abduct thigh
Muscles That Move the Leg
- Sartorius: Flexes leg at the knee; flexes thigh on hip; abducts the thigh; laterally rotates leg; medially rotates leg
- Quadriceps femoris(Rectus femoris, Vastus lateralis, Vastus medialis, Vastus intermedius): Extends leg at the knee; flexes thighs at hips
Muscles That Move the Ankle, Foot, and Toes
- Tibialis anterior: Moves the foot up and down
- Fibularis longus: Moves the foot side to side
Muscles That Move the Ankle, Foot and Toes (Specific)
Gastrocnemius: Plantar flexes foot and flexes knee Soleus: Plantar flexes foot
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Description
This quiz covers the muscles involved in facial expression, head movement, and the pectoral girdle. Learn the functions and actions of each muscle such as the frontalis, trapezius, and sternocleidomastoid. Test your knowledge on how these muscles contribute to movement and positioning.
