Podcast
Questions and Answers
What is the primary action of the frontalis muscle?
What is the primary action of the frontalis muscle?
Raises the eyebrows
Name the muscle that assists in chewing and closing the jaw.
Name the muscle that assists in chewing and closing the jaw.
Masseter
What is the primary function of the diaphragm muscle?
What is the primary function of the diaphragm muscle?
Inspiration (inhalation)
Which muscle group is primarily responsible for trunk flexion?
Which muscle group is primarily responsible for trunk flexion?
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Name the muscle that laterally rotates and abducts the arm at the shoulder joint.
Name the muscle that laterally rotates and abducts the arm at the shoulder joint.
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What is the primary action of the biceps brachii muscle?
What is the primary action of the biceps brachii muscle?
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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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Name the muscle that protrudes the lips and assists in whistling.
Name the muscle that protrudes the lips and assists in whistling.
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What is the primary function of the sternocleidomastoid muscle?
What is the primary function of the sternocleidomastoid muscle?
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Name the muscle group that primarily flexes the vertebral column.
Name the muscle group that primarily flexes the vertebral column.
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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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Name the muscle that laterally rotates the arm at the shoulder joint.
Name the muscle that laterally rotates the arm at the shoulder joint.
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Study Notes
Muscles of the Face
- Frontalis: originates from the galea aponeurotica, inserts into the skin of the forehead, and elevates the eyebrows
- Orbicularis oculi: originates from the medial orbital margin, inserts into the skin around the eye, and closes the eyelids
- Levator labii: originates from the maxilla, inserts into the skin of the upper lip, and elevates the upper lip
- Orbicularis oris: originates from the maxilla and mandible, inserts into the skin around the mouth, and closes the mouth
- Buccinator: originates from the maxilla and mandible, inserts into the angle of the mouth, and compresses the cheek
Muscles of Mastication
- Masseter: originates from the zygomatic arch, inserts into the mandible, and elevates the mandible
- Temporalis: originates from the temporal bone, inserts into the mandible, and elevates the mandible
- Medial pterygoid: originates from the medial pterygoid plate, inserts into the mandible, and elevates the mandible
- Lateral pterygoid: originates from the lateral pterygoid plate, inserts into the mandible, and depresses the mandible
Muscles of the Neck
- Sternocleidomastoid: originates from the sternum and clavicle, inserts into the mastoid process, and rotates the head
- Splenius capitis: originates from the ligamentum nuchae, inserts into the occipital bone, and extends the head
- Semispinalis capitis: originates from the thoracic vertebrae, inserts into the occipital bone, and extends the head
Muscles of the Thorax
- External intercostals: originates from the ribs, inserts into the ribs, and elevates the ribs
- Internal intercostals: originates from the ribs, inserts into the ribs, and depresses the ribs
- Diaphragm: originates from the xiphoid process, inserts into the ribs, and descends the diaphragm
Muscles of the Abdominal Wall
- Rectus abdominis: originates from the pubis, inserts into the xiphoid process, and flexes the spine
- External abdominal obliques: originates from the ribs, inserts into the iliac crest, and rotates the torso
- Internal abdominal obliques: originates from the thoracolumbar fascia, inserts into the iliac crest, and rotates the torso
- Transversus abdominis: originates from the thoracolumbar fascia, inserts into the pubis, and compresses the abdominal contents
Muscles of the Back
- Erector spinae: originates from the thoracolumbar fascia, inserts into the vertebrae, and extends the spine
Muscles of the Upper Limb
- Pectoralis major: originates from the clavicle and sternum, inserts into the humerus, and adducts the arm
- Pectoralis minor: originates from the ribs, inserts into the scapula, and depresses the scapula
- Serratus anterior: originates from the ribs, inserts into the scapula, and rotates the scapula
- Deltoid: originates from the clavicle and scapula, inserts into the humerus, and abducts the arm
- Trapezius: originates from the occipital bone, inserts into the scapula and clavicle, and elevates the scapula
- Latissimus dorsi: originates from the thoracolumbar fascia, inserts into the humerus, and adducts the arm
- Levator scapulae: originates from the transverse processes, inserts into the scapula, and elevates the scapula
- Rhomboids: originates from the thoracic vertebrae, inserts into the scapula, and rotates the scapula
- Supraspinatus: originates from the supraspinous fossa, inserts into the humerus, and abducts the arm
- Infraspinatus: originates from the infraspinous fossa, inserts into the humerus, and rotates the arm
- Subscapularis: originates from the subscapular fossa, inserts into the humerus, and rotates the arm
- Teres minor: originates from the scapula, inserts into the humerus, and adducts the arm
- Teres major: originates from the scapula, inserts into the humerus, and adducts the arm
- Biceps brachii: originates from the scapula, inserts into the radius, and flexes the elbow
- Brachialis: originates from the humerus, inserts into the ulna, and flexes the elbow
- Triceps brachii: originates from the scapula and humerus, inserts into the ulna, and extends the elbow
- Brachioradialis: originates from the humerus, inserts into the radius, and flexes the elbow
- Pronator teres: originates from the humerus and ulna, inserts into the radius, and pronates the forearm
- Supinator: originates from the humerus and ulna, inserts into the radius, and supinates the forearm
- Wrist flexors: originate from the forearm, insert into the phalanges, and flex the wrist
- Wrist extensors: originate from the forearm, insert into the phalanges, and extend the wrist
Muscles of the Lower Limb
- Iliopsoas: originates from the ilium and lumbar vertebrae, inserts into the femur, and flexes the hip
- Sartorius: originates from the anterior superior iliac spine, inserts into the tibia, and flexes the knee
- Adductor femoris group: originates from the pubis, inserts into the femur, and adducts the thigh
- Gracilis: originates from the pubis, inserts into the tibia, and adducts the thigh
- Gluteus maximus: originates from the ilium and sacrum, inserts into the femur, and extends the hip
- Gluteus minimus: originates from the ilium, inserts into the femur, and abducts the thigh
- Gluteus medius: originates from the ilium, inserts into the femur, and abducts the thigh
- Rectus femoris: originates from the anterior inferior iliac spine, inserts into the tibia, and extends the knee
- Vastus lateralis: originates from the femur, inserts into the tibia, and extends the knee
- Vastus medialis: originates from the femur, inserts into the tibia, and extends the knee
- Vastus intermedius: originates from the femur, inserts into the tibia, and extends the knee
- Biceps femoris: originates from the ischial tuberosity, inserts into the fibula, and flexes the knee
- Semitendinosus: originates from the ischial tuberosity, inserts into the tibia, and flexes the knee
- Semimembranosus: originates from the ischial tuberosity, inserts into the tibia, and flexes the knee
- Tibialis anterior: originates from the tibia, inserts into the foot, and dorsiflexes the ankle
- Gastrocnemius: originates from the femur, inserts into the calcaneus, and plantarflexes the ankle
- Soleus: originates from the tibia and fibula, inserts into the calcaneus, and plantarflexes the ankle
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Description
Test your knowledge on the origins, insertions, and actions of various muscles including Frontalis, orbicularis oculi, levator labii, orbicularis oris, and many more. This quiz covers a wide range of muscles throughout the body.
