Podcast
Questions and Answers
The zygomaticus muscle is responsible for drawing the angle of the mouth downward, as in a frown.
The zygomaticus muscle is responsible for drawing the angle of the mouth downward, as in a frown.
False
The digastric muscles are important in chewing because they raise the mandible and close the mouth.
The digastric muscles are important in chewing because they raise the mandible and close the mouth.
False
The triceps brachii muscle originates from processes on the humerus and the radius.
The triceps brachii muscle originates from processes on the humerus and the radius.
False
The sartorius muscle acts on both the hip joint and the knee joint.
The sartorius muscle acts on both the hip joint and the knee joint.
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A pulled groin muscle could involve the tensor fasciae latae.
A pulled groin muscle could involve the tensor fasciae latae.
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The palmaris longus muscle is located posteriorly and functions to extend the hand.
The palmaris longus muscle is located posteriorly and functions to extend the hand.
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Study Notes
Facial Muscles
- Contraction of the zygomaticus muscle draws the angle of the mouth upward, resulting in a smile.
- Contraction of the orbicularis oris muscle compresses the lips together.
Muscles of Mastication
- The digastric muscles are essential for chewing, as they lower the mandible and open the mouth when contracted.
Muscles of the Back
- Flexion of the vertebral column occurs when the liliocostalis muscles are contracted.
Muscles of the Upper Limb
- The triceps brachii muscle originates from processes on the humerus and scapula.
- The pectoralis minor muscle rotates and adducts the humerus when contracted.
Muscles of the Lower Limb
- The semimembranosus muscle flexes the leg at the knee joint and may also extend the thigh at the hip joint when contracted.
- The gracilis muscle is involved in a pulled groin muscle.
- The sartorius muscle acts only on the hip joint.
- The quadriceps femoris muscles are antagonistic to the hamstring muscles.
- The three gluteal muscles insert on the greater trochanter of the femur.
Muscles of the Foot
- The gastrocnemius, soleus, and plantaris muscles function synergistically in plantar flexion of the foot.
Muscles of the Abdominal Wall
- The anterior abdominal wall consists of the external abdominal oblique, internal abdominal oblique, and transverse abdominis muscles, in order from superficial to deep.
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Description
Test your knowledge on muscle anatomy and function with this quiz covering different muscle actions and their descriptions. From smiling to chewing and spinal flexion, this quiz will challenge your understanding of how muscles work in the body.
