Mbi - Muscle Test 2

The given correct answer is "Deltoid." The deltoid muscle is a large, triangular muscle located on the outer side of the shoulder. It is responsible for various movements of the arm, including abduction (raising the arm away from the body), flexion (bringing the arm forward), and extension (bringing the arm backward). The deltoid muscle is easily identifiable due to its shape and location on the shoulder.

The muscle identified in the question is the infraspinatus.

The muscle identified in the given question is the Latissimus Dorsi. The Latissimus Dorsi is a large, flat muscle that spans across the lower back and extends up to the armpit. It is responsible for various movements of the shoulder joint, such as pulling the arm down and back, rotating the arm inwards, and assisting in activities like swimming, rowing, and climbing.

The muscle identified is the Pectoralis Major.

The muscle identified in the question is the Pectoralis Minor.

The correct answer is Rhomboids. The rhomboids are a pair of muscles located in the upper back between the shoulder blades. They help retract and stabilize the scapulae (shoulder blades) by pulling them towards the spine. These muscles play a crucial role in maintaining good posture and are often targeted in exercises that aim to strengthen the upper back.

The correct answer is Subscapularis.

The muscle identified in the question is the supraspinatus.

The muscle identified in the question is the Teres Major.

The muscle that needs to be identified is the Teres Minor.

The correct answer is Biceps Brachii. The biceps brachii is a muscle located in the upper arm. It is a two-headed muscle that runs from the shoulder to the elbow. The biceps brachii is responsible for flexing the elbow joint and supinating the forearm. It is a prominent muscle that is often associated with strength and is commonly targeted in arm exercises.

The rhomboids are the muscles located in the space between the vertebral column and scapula. These muscles play a crucial role in retracting the scapulae (pulling them towards the spine) and stabilizing the shoulder blades. They work together with other muscles to maintain proper posture and facilitate movements of the upper back and shoulders. The serratus anterior muscle is located along the lateral sides of the rib cage, the levator scapulae muscle elevates the scapula, and the latissimus dorsi muscle is located on the back and helps with movements of the shoulder joint.

The muscle being identified is the Levator Scapula.

The infraspinatus is a muscle located in the shoulder joint. Its main action is to laterally rotate the shoulder. This means that it helps to move the arm away from the midline of the body, rotating it outward. This action is important for various movements such as throwing, reaching, and lifting objects to the side.

The teres major muscle is a complete synergist with the latissimus dorsi, meaning that it assists and works together with the latissimus dorsi to perform certain movements. It is sometimes referred to as "lat's little helper" because it helps the latissimus dorsi in actions such as extending, adducting, and internally rotating the arm at the shoulder joint. The teres major muscle is located on the back of the upper arm and is responsible for various movements involving the shoulder.

The greater tubercle is the shared attachment site for three out of four rotator cuff muscles. The rotator cuff muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. The supraspinatus, infraspinatus, and teres minor muscles all attach to the greater tubercle of the humerus bone. This attachment allows these muscles to help stabilize and move the shoulder joint. The coracoid process is not a shared attachment site for the rotator cuff muscles.

The insertion of the supraspinatus muscle is the greater tubercle of the humerus. This means that the supraspinatus muscle attaches to the bony prominence on the upper part of the humerus called the greater tubercle. This insertion point allows the supraspinatus muscle to play a role in shoulder movement and stability. The other options mentioned, such as the coracoid process of the scapula, lesser tubercle of the humerus, and angle of the acromion, are not the correct insertion points for the supraspinatus muscle.

The supraspinatus muscle is responsible for the abduction of the shoulder. Abduction refers to the movement of the arm away from the midline of the body. This muscle is located on the upper part of the scapula and plays a key role in stabilizing and initiating the movement of the shoulder joint. When the supraspinatus muscle contracts, it helps to lift the arm out to the side, allowing for the abduction of the shoulder.

The origin of the infraspinatus muscle is the infraspinous fossa of the scapula. This is the specific area on the posterior (back) side of the scapula where the muscle originates. The other options mentioned, such as the inferior half of the lateral border of the scapula, the spine of the scapula, and the medial border of the scapula, are not the correct origins for the infraspinatus muscle.

The insertion of the brachialis muscle is on the tuberosity and coronoid process of the ulna. This means that the brachialis muscle attaches to these specific parts of the ulna bone.

In anatomical position, the extensor group is located on the posterior/lateral portion of the forearm. This means that the extensor muscles, which are responsible for extending the wrist and fingers, are found on the back side (posterior) and outer side (lateral) of the forearm.

The insertion of the deltoid muscle is the deltoid tuberosity. The deltoid tuberosity is a rough, bony prominence located on the lateral side of the humerus, towards the middle of the bone. This is where the tendon of the deltoid muscle attaches, allowing it to exert its action on the arm. The deltoid muscle is responsible for various movements of the shoulder joint, including abduction, flexion, and extension.

Lateral rotation would shorten the fibers of the infraspinatus. The infraspinatus is one of the muscles responsible for rotating the shoulder. Lateral rotation refers to the movement of rotating the shoulder away from the midline of the body. When the shoulder is laterally rotated, the fibers of the infraspinatus muscle are contracted and shortened, causing the movement.

The thin sheet of fascia that extends off the distal tendon of the biceps brachii is called the bicipital aponeurosis. This structure helps to strengthen and stabilize the distal tendon of the biceps brachii, providing support and preventing excessive movement. It acts as a continuation of the tendon and helps to distribute the forces generated by the muscle. The bicipital aponeurosis also serves as an attachment site for other muscles and fascial layers in the arm.

The brachioradialis muscle is located in the forearm and runs along the lateral side of the arm. It acts as a dividing line between the flexors and extensors of the wrist and hand. This muscle helps to stabilize the wrist and assist in movements such as flexion and extension. It is an important muscle for maintaining proper alignment and balance between the flexor and extensor muscles in the forearm.

The origin of the trapezius muscle includes the external occipital protuberance and the medial portion of the superior nuchal line of the occiput. These structures are located on the back of the skull and provide attachment points for the trapezius muscle. The trapezius muscle is a large, triangular muscle that extends from the base of the skull down to the thoracic spine and laterally to the spine of the scapula. It is involved in movements of the shoulder girdle, such as elevation, retraction, and rotation of the scapula.

The deltoid muscle originates from the lateral third of the clavicle, acromion, and spine of the scapula. The insertion of the deltoid is on the deltoid tuberosity of the humerus. The trapezius muscle, on the other hand, originates from the occipital bone, spinous processes of the cervical and thoracic vertebrae, and the ligamentum nuchae. It inserts onto the clavicle, acromion, and spine of the scapula. Therefore, the origin of the deltoid is identical to the insertion of the trapezius muscle.

Abduction is the correct answer because it refers to the movement of the arm away from the midline of the body. When the arm is abducted, the fibers of the supraspinatus muscle are shortened. This muscle is located on the top of the shoulder and is responsible for initiating the movement of abduction. By shortening its fibers, the supraspinatus helps to lift the arm away from the body.

The triceps brachii is the only muscle of the posterior arm. It is a three-headed muscle located on the back of the upper arm. It is responsible for extending the forearm at the elbow joint. The biceps brachii is a muscle of the anterior arm, while the coracobrachialis and brachialis are also muscles of the anterior arm. Therefore, the triceps brachii is the correct answer as it is the only muscle listed that belongs to the posterior arm.

The pectoralis minor is located deep to the pectoralis major muscle. The pectoralis major is a large muscle that covers the upper part of the chest, while the pectoralis minor is a smaller muscle that lies underneath it. This arrangement allows the pectoralis major to provide the main bulk and strength to the chest, while the pectoralis minor assists in movements of the shoulder and scapula.

The levator scapula is a muscle responsible for elevating the scapula, which means it helps to lift the shoulder blade upwards. This action is important for various movements of the shoulder and arm, such as lifting objects or reaching overhead. The other options mentioned in the question, such as rotating the head and neck to the opposite side or depressing the scapula, are not actions of the levator scapula.

The deltoid muscle originates from the lateral one-third of the clavicle, the acromion, and the spine of the scapula. This means that these three structures provide the attachment site for the deltoid muscle, allowing it to perform its functions such as shoulder abduction and flexion. The other options mentioned do not accurately describe the origin of the deltoid muscle.

The pectoralis major is a large muscle in the chest region. It originates from the medial half of the clavicle (collarbone) and the sternum (breastbone). This means that the muscle attaches to and originates from these two bones. The other options listed, such as the cartilage of ribs 7-12, the sternum, xiphoid process, and linea alba, and the lateral half of the clavicle and coracoid process, are not part of the origin of the pectoralis major. Therefore, the correct answer is the medial half of the clavicle and sternum.

The pectoralis major's upper fibers are responsible for horizontally adducting the shoulder. This means that they bring the arm closer to the midline of the body when it is already abducted or extended. This action is commonly seen when hugging someone or crossing the arms in front of the body.

The biceps brachii is a muscle located in the upper arm that is responsible for flexing the elbow joint. When the biceps brachii contracts, it causes the forearm to move towards the upper arm, resulting in the bending of the elbow. This action is commonly used in activities such as lifting objects or performing bicep curls.

The correct answer is the intertubercular groove of the humerus. The latissimus dorsi muscle is a large muscle of the back that originates from the lower back and inserts into the upper arm. It attaches to the humerus bone by inserting into the intertubercular groove, which is a groove located between the two tubercles of the humerus bone. This attachment allows the latissimus dorsi muscle to play a role in various movements of the shoulder and arm, such as extension, adduction, and internal rotation.

The rhomboids are located between the erector spinae muscles and the trapezius muscle. They are superficial to the erector spinae and deep to the trapezius muscle.

The brachioradialis is a muscle located in the forearm. Its main action is to flex the elbow joint. When the brachioradialis contracts, it helps to bend the forearm towards the upper arm. This muscle is responsible for movements such as lifting objects or performing a bicep curl. It does not have any significant role in extending the elbow, flexing the wrist, or extending the wrist.

The supraspinatus muscle is responsible for shoulder abduction. It is one of the four muscles that make up the rotator cuff, located on the top of the shoulder blade. When the supraspinatus muscle contracts, it helps to lift the arm away from the body, allowing for abduction of the shoulder joint. This muscle is commonly involved in rotator cuff injuries and is important for maintaining shoulder stability and range of motion.

The insertion of the infraspinatus muscle is the greater tubercle of the humerus. This means that the infraspinatus muscle attaches to the larger bump on the upper end of the humerus bone.

The subscapularis muscle originates from the subscapular fossa of the scapula. This fossa is located on the anterior surface of the scapula, and it provides the attachment site for the subscapularis muscle. The greater tubercle of the humerus is the insertion point for the subscapularis muscle, not the origin. The supraspinous fossa of the scapula is the origin of the supraspinatus muscle, not the subscapularis. The medial border of the scapula is not the origin of the subscapularis muscle.

The supraspinatus muscle originates from the supraspinous fossa of the scapula. This is a shallow depression located on the posterior aspect of the scapula, above the spine of the scapula. The supraspinatus muscle plays an important role in shoulder abduction and stabilization of the shoulder joint.

The teres minor muscle is inserted on the greater tubercle of the humerus. This means that the muscle attaches to the bony prominence on the lateral side of the humerus. The greater tubercle is located just above the surgical neck of the humerus and serves as a point of attachment for various muscles, including the teres minor.

The correct answer is the olecranon process of the ulna. The triceps brachii is a muscle that is responsible for extending the forearm. It is attached to the olecranon process of the ulna, which is a bony prominence at the back of the elbow. When the triceps brachii contracts, it pulls on the olecranon process, causing the forearm to straighten. The other options mentioned, such as the tuberosity of the radius, medial epicondyle of the humerus, and shaft of the ulna, are not sites of insertion for the triceps brachii muscle.

The brachialis is a muscle located in the upper arm. Its main action is to flex the elbow joint, which means it is responsible for bending the arm at the elbow. This action is important for various everyday activities such as lifting objects, throwing a ball, or performing bicep curls. The brachialis works in conjunction with other muscles in the arm to provide strength and stability during elbow flexion.

The origin of the brachiordialis is the proximal two-thirds of the lateral supracondylar ridge of the humerus.

The latissimus dorsi muscle originates from the thoracolumbar aponeurosis. The thoracolumbar aponeurosis is a broad, flat tendon that covers the lower back and connects to the spine and the iliac crest. It serves as an attachment point for several muscles, including the latissimus dorsi. This muscle plays a role in shoulder extension, adduction, and medial rotation, as well as in stabilizing the lower back. The other options listed (lateral border of scapula, anterior superior iliac crest, and greater tubercle of humerus) are not part of the origin of the latissimus dorsi muscle.

Lateral flexion refers to the movement of bending the body sideways. This movement primarily occurs in the axial skeleton, which includes the skull, vertebral column, and rib cage. The shoulder joint allows for movement in multiple directions but is not specifically responsible for lateral flexion. The scapula is a bone in the shoulder girdle and does not directly participate in lateral flexion. The feet are not involved in lateral flexion as they primarily provide support and balance. Therefore, the axial skeleton is the correct answer as it is the main region where lateral flexion occurs.

The deltoid is a muscle located in the shoulder that is responsible for various movements of the arm. One of its main actions is to abduct the shoulder, which means to move the arm away from the body. This movement is commonly seen when raising the arm sideways. Therefore, the correct answer is "abduct the shoulder".

The subscapularis muscle attaches to the lesser tubercle. The rotator cuff muscles are a group of muscles that surround the shoulder joint and help to stabilize and move the shoulder. The subscapularis muscle is located on the anterior side of the scapula and is responsible for internal rotation of the shoulder joint. It originates from the subscapular fossa of the scapula and inserts onto the lesser tubercle of the humerus.