Muscular Actions Warm Up 2

The given statement is false. The brachioradialis muscle is not located in the upper thigh of the leg. It is actually located in the forearm, specifically in the upper arm near the elbow.

The statement is true because the deltoid muscle, which covers the shoulder, is indeed named after its shape, which is triangular or delta-shaped. This is a common practice in anatomy, where descriptive features such as shape are used to name various muscles.

Muscles in the human body are named based on various features, such as the number of heads, direction of fibers, point of attachment, and size of the muscle. However, the color of the muscle fibers is not used as a feature for naming muscles. Muscle names are typically derived from Latin or Greek terms that describe their shape, location, or function, rather than their color. Therefore, the color of the muscle fibers is not a relevant factor in the naming process.

The gluteus maximus is a large muscle located in the buttocks, specifically in the appendicular region of the body. It is responsible for the movement of the hip and thigh, such as extending the hip and rotating the thigh outward. The term "appendicular" refers to the limbs or appendages of the body, which includes the legs. Therefore, the gluteus maximus is located in the appendicular region of the legs.

The temporalis muscles are indeed part of the muscle group responsible for mastication, or chewing. These muscles are located on the side of the head and are responsible for closing the jaw during chewing. Therefore, the statement that the temporalis muscles compose the muscle group of mastication is correct.

There are seven methods of how muscles are named.

The biceps brachii muscles, located in the arm, have two points of origin. These points are the short head and the long head. The short head originates from the coracoid process of the scapula, while the long head originates from the supraglenoid tubercle of the scapula. Both heads of the biceps brachii muscle merge and form a single muscle belly, which then attaches to the radius bone in the forearm. Therefore, the correct answer is two.

The given correct answer for this question is "Location". When naming muscles, terms such as anterior, medial, posterior, and upper arm are used to describe their location in the body. This helps in identifying and locating specific muscles in relation to other anatomical structures.

Muscles may be named according to the orientation of their fibers. This is termed "Direction of Fibers" because the naming of muscles based on the direction in which their fibers run helps to identify and differentiate them. The orientation of muscle fibers can vary, such as being parallel, oblique, or circular, and this characteristic is often used in naming muscles to provide a clear understanding of their structure and function.

Muscles are named based on their size. Terms like gluteus maximus and gluteus medius refer to the size of the muscles in the buttocks. The term "maximus" indicates that the muscle is the largest in that region, while "medius" suggests that it is a medium-sized muscle. This naming convention helps to identify and differentiate muscles based on their relative size within a specific area of the body.

Origin and insertion points refer to the points where a muscle attaches to bones. These points are often used to name a muscle, as they provide information about the muscle's location and function. By identifying the points of attachment, one can understand how the muscle moves and what actions it is responsible for. Therefore, using the origin and insertion points to name a muscle is called "Point of Attachment".

The flexor carpi radialis and ulnaris are muscles located in the forearm. When they contract, they cause flexion of the wrist joint, resulting in movement of the hand. Therefore, the correct answer is hand.

A class III lever has the fulcrum located at one end, the load at the other end, and the effort (pull) in between. In this type of lever, the force applied to the lever is greater than the load being lifted, allowing for an advantage in speed and range of motion. Examples of class III levers include tweezers, fishing rods, and human arms.

The Gastrocnemius muscle is located on the posterior leg surface. It is a large muscle that forms the bulk of the calf and is responsible for flexing the foot and bending the knee. This muscle is easily visible and palpable on the back of the leg, especially when the foot is pointed downwards. It is important for activities such as walking, running, and jumping.

A class II lever has the fulcrum located between the load and the force being applied (pull). In this type of lever, the load is farther away from the fulcrum than the force, which allows for a mechanical advantage. This means that a smaller force can be used to move a larger load. Therefore, a class II lever is the correct answer for a lever with the fulcrum, load, and pull arrangement described in the question.