Lab Exam 3 Muscles

1. Identify the highlighted muscle.

The correct answer is Biceps Brachii. This is a muscle located in the upper arm that is responsible for flexing the elbow joint and rotating the forearm. It is a two-headed muscle, which is why it is called "biceps" (meaning two heads) and "brachii" (referring to the arm). The biceps brachii is a prominent muscle that is easily visible when the arm is flexed.

Explanation

The correct answer is Biceps Brachii. This is a muscle located in the upper arm that is responsible for flexing the elbow joint and rotating the forearm. It is a two-headed muscle, which is why it is called "biceps" (meaning two heads) and "brachii" (referring to the arm). The biceps brachii is a prominent muscle that is easily visible when the arm is flexed.

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3. Which muscle in this image closes the eyelid?

The muscle in the image that closes the eyelid is the Orbicularis Oculi. This muscle is responsible for closing the eyelid and is located around the eye socket. It is a circular muscle that encircles the eye and helps in blinking and closing the eye tightly.

Explanation

The muscle in the image that closes the eyelid is the Orbicularis Oculi. This muscle is responsible for closing the eyelid and is located around the eye socket. It is a circular muscle that encircles the eye and helps in blinking and closing the eye tightly.

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11. Identify the highlighted muscle.

The highlighted muscle in the question is the Orbicularis Oris. This muscle is responsible for the movement and control of the lips, allowing for actions such as puckering, smiling, and closing the mouth. It forms a circular shape around the mouth and is involved in various facial expressions and functions related to speech and eating.

Explanation

The highlighted muscle in the question is the Orbicularis Oris. This muscle is responsible for the movement and control of the lips, allowing for actions such as puckering, smiling, and closing the mouth. It forms a circular shape around the mouth and is involved in various facial expressions and functions related to speech and eating.

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14. Which muscle in this image closes the eyelid?

The muscle in the image that closes the eyelid is the Orbicularis Oculi. This muscle is responsible for closing the eyelids and protecting the eyes from external factors such as dust or bright light. It is a circular muscle that surrounds the eye and allows for blinking and squinting movements.

Explanation

The muscle in the image that closes the eyelid is the Orbicularis Oculi. This muscle is responsible for closing the eyelids and protecting the eyes from external factors such as dust or bright light. It is a circular muscle that surrounds the eye and allows for blinking and squinting movements.

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28. Which belly of the epicranius helps to raise the eyebrows.

The frontal belly of the epicranius muscle helps to raise the eyebrows. This muscle is located in the forehead region and when it contracts, it pulls the eyebrows upwards, creating a raised or surprised expression.

Explanation

The frontal belly of the epicranius muscle helps to raise the eyebrows. This muscle is located in the forehead region and when it contracts, it pulls the eyebrows upwards, creating a raised or surprised expression.

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31. The highlighted muscle extends and abducts the __________.

The highlighted muscle extends and abducts the wrist. This means that it is responsible for straightening and moving the wrist away from the body's midline.

Explanation

The highlighted muscle extends and abducts the wrist. This means that it is responsible for straightening and moving the wrist away from the body's midline.

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32. From which structure of the scapula does the short head of this muscle originate?

The short head of the muscle originates from the coracoid process of the scapula. The coracoid process is a bony projection located on the anterior side of the scapula. It provides attachment points for various muscles, including the short head of this particular muscle. By originating from the coracoid process, the muscle is able to exert force and contribute to movements of the shoulder and arm.

Explanation

The short head of the muscle originates from the coracoid process of the scapula. The coracoid process is a bony projection located on the anterior side of the scapula. It provides attachment points for various muscles, including the short head of this particular muscle. By originating from the coracoid process, the muscle is able to exert force and contribute to movements of the shoulder and arm.

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33. Identify the highlighted muscle.

The highlighted muscle in the question is the Erector Spinae. The Erector Spinae is a group of muscles that run along the length of the spine and are responsible for extending and straightening the back. They also provide support and stability to the spine, allowing for movements such as bending forward and twisting. The Erector Spinae muscles play a crucial role in maintaining posture and are commonly targeted in exercises that aim to strengthen the back muscles.

Explanation

The highlighted muscle in the question is the Erector Spinae. The Erector Spinae is a group of muscles that run along the length of the spine and are responsible for extending and straightening the back. They also provide support and stability to the spine, allowing for movements such as bending forward and twisting. The Erector Spinae muscles play a crucial role in maintaining posture and are commonly targeted in exercises that aim to strengthen the back muscles.

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34. On which structure of the femur does the highlighted muscle insert?

The highlighted muscle inserts on the gluteal tuberosity of the femur. The gluteal tuberosity is a rough, bony prominence located on the posterior aspect of the femur, specifically on the upper part of the shaft. This tuberosity serves as the attachment site for the gluteus maximus muscle, which is responsible for hip extension and lateral rotation. By inserting on the gluteal tuberosity, the gluteus maximus muscle can exert its force and contribute to the movement and stability of the hip joint.

Explanation

The highlighted muscle inserts on the gluteal tuberosity of the femur. The gluteal tuberosity is a rough, bony prominence located on the posterior aspect of the femur, specifically on the upper part of the shaft. This tuberosity serves as the attachment site for the gluteus maximus muscle, which is responsible for hip extension and lateral rotation. By inserting on the gluteal tuberosity, the gluteus maximus muscle can exert its force and contribute to the movement and stability of the hip joint.

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37. The highlighted muscle is the flexor pollicis __________.

The correct answer is "brevis." The term "flexor pollicis brevis" refers to a muscle in the hand that is responsible for flexing the thumb. The word "brevis" means short, indicating that this muscle is a shorter version of the flexor pollicis longus muscle.

Explanation

The correct answer is "brevis." The term "flexor pollicis brevis" refers to a muscle in the hand that is responsible for flexing the thumb. The word "brevis" means short, indicating that this muscle is a shorter version of the flexor pollicis longus muscle.

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38. The highlighted muscle is the flexor digitorum __________.

The correct answer is "Brevis" because the question is asking for the name of the muscle that is highlighted. Since "Brevis" is the only option provided, it must be the correct answer.

Explanation

The correct answer is "Brevis" because the question is asking for the name of the muscle that is highlighted. Since "Brevis" is the only option provided, it must be the correct answer.

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39. From which part of the scapula does this muscle originate?

The muscle in question originates from two parts of the scapula: the acromion and the spine. These two specific areas on the scapula serve as the starting point for the muscle, indicating its point of origin.

Explanation

The muscle in question originates from two parts of the scapula: the acromion and the spine. These two specific areas on the scapula serve as the starting point for the muscle, indicating its point of origin.

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42. From which structure of the ischium does the highlighted muscle originate? (looks like the semimembraneous muscle)

The highlighted muscle, which appears to be the semimembranosus muscle, originates from the ischial ramus. The ischial ramus is a bony projection of the ischium, which is one of the three bones that make up the hip bone. The semimembranosus muscle is one of the hamstring muscles located at the back of the thigh, and it plays a role in extending the hip and flexing the knee. Its origin from the ischial ramus allows it to generate the necessary force for these movements.

Explanation

The highlighted muscle, which appears to be the semimembranosus muscle, originates from the ischial ramus. The ischial ramus is a bony projection of the ischium, which is one of the three bones that make up the hip bone. The semimembranosus muscle is one of the hamstring muscles located at the back of the thigh, and it plays a role in extending the hip and flexing the knee. Its origin from the ischial ramus allows it to generate the necessary force for these movements.

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49. What is the action of the highlighted muscle?

The highlighted muscle is responsible for pronating the forearm, which means it turns the palm of the hand to face downwards. Additionally, it also acts as a weak flexor of the elbow, meaning it assists in bending the elbow joint.

Explanation

The highlighted muscle is responsible for pronating the forearm, which means it turns the palm of the hand to face downwards. Additionally, it also acts as a weak flexor of the elbow, meaning it assists in bending the elbow joint.

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50. The highlighted muscle inserts on what structure of the humerus?

The highlighted muscle inserts on the Intertubercular Sulcus and Greater Tubercle of the humerus.

Explanation

The highlighted muscle inserts on the Intertubercular Sulcus and Greater Tubercle of the humerus.

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