Muscle Anatomy Quiz Review

The prime mover for forearm extension is:

• Diaphragm

• Triceps brachii

• Quadriceps femoris

• Hamstrings

Answer explanation

The triceps brachii is the primary muscle responsible for extending the forearm at the elbow joint, making it the correct answer. The diaphragm is involved in respiration, while the quadriceps and hamstrings are related to leg movements.

The brachioradialis is the synergist to this muscle in flexion:

• Biceps brachii

• Tibialis anterior

• Latissimus dorsi

• Adductors

Answer explanation

The brachioradialis assists the biceps brachii in flexing the elbow. Both muscles work together to perform this action, making the biceps brachii the correct synergist for the brachioradialis during flexion.

The antagonists of the quadriceps, located in the posterior thigh, are:

• Diaphragm

• Hamstrings

• Epicranius

• Triceps brachii

Answer explanation

The hamstrings are the antagonists of the quadriceps, as they are located in the posterior thigh and work to flex the knee, opposing the quadriceps which extend the knee.

The prime mover for inhalation is:

• Diaphragm

• Quadriceps femoris

• Biceps brachii

• Adductors

Answer explanation

The diaphragm is the primary muscle responsible for inhalation. When it contracts, it flattens and increases the thoracic cavity volume, allowing air to flow into the lungs. The other options are not involved in the breathing process.

The main muscle of the scalp that allows you to raise your eyebrows and wrinkle your forehead is:

• Latissimus dorsi

• Epicranius

• Tibialis anterior

• Hamstrings

Answer explanation

The epicranius is the main muscle of the scalp responsible for raising the eyebrows and wrinkling the forehead. The other options, like latissimus dorsi and hamstrings, are unrelated to facial movements.

The large triangular muscle of the lower back is:

• Quadriceps femoris

• Latissimus dorsi

• Adductors

• Diaphragm

Answer explanation

The latissimus dorsi is the large triangular muscle located in the lower back, responsible for various movements of the shoulder and arm. The other options refer to different muscle groups or locations.

The main muscles of the inner thighs are:

• Adductors

• Triceps brachii

• Hamstrings

• Epicranius

Answer explanation

The main muscles of the inner thighs are the adductors, which are responsible for bringing the legs together. The other options, such as triceps brachii and hamstrings, are located in different areas of the body.

This group of four muscles is considered the most powerful in the human body:

• Biceps brachii

• Quadriceps femoris

• Tibialis anterior

• Diaphragm

Answer explanation

The quadriceps femoris is the largest muscle group in the body, located in the thigh, and is responsible for powerful movements like jumping and running, making it the most powerful muscle group compared to the other options.

The prime mover in dorsiflexion is:

• Tibialis anterior

• Latissimus dorsi

• Epicranius

• Hamstrings

Answer explanation

The prime mover in dorsiflexion is the tibialis anterior, which is responsible for lifting the foot upwards. The other options do not play a primary role in this specific movement.

The antagonist in forearm flexion is:

• Triceps brachii

• Diaphragm

• Quadriceps femoris

• Adductors

Answer explanation

The triceps brachii acts as the antagonist during forearm flexion, opposing the action of the biceps brachii, which is the primary mover in this motion.