Step 3: Summarize skeletal muscle group interactions in the body Define and give

Question

Step 3: Summarize skeletal muscle group interactions in the body Define and give an example of a prime mover (agonist). -Define and give a n example of an antagonist. Define and give an example of a synergist. Define and give an example of a fixator. Step 4: Understand the naming of skeletal muscles. List criteria for the naming of skeletal muscles. Give an example of a muscle that fits each criterion listed. Step 5: Organize the body's muscles into functional groups ba on developmental origins Distinguish myotomes from somitomeres. Explain the developmental-based scheme for the development of musculature of the visceral organs. Describe the developmental-based scheme for the development of pharyngeal arch Describe the developmental-based scheme for the Explain the developmental-based scheme for the Step 6: Focus on specific skeletal muscles and respective muscles. development of axial muscles. development of limb muscles. groups described in Tables 11.1-11.17 as assigned by your instructor List criteria for determining the origin and insertion of a Make sure you understand all the body movements detailed Describe the action of each assigned muscle, and explain the ac Design flash cards for assigned muscles, including muscle shap muscle in Figures 9.5 and 9.6 based on the origin and insertion of the muscle. location, attachments, actions, and nnervation

Explanation / Answer

Answer:

Step 3

Prime mover : It is the muscle that contracts to cause a type of movement. In case of forearm flexion, the biceps muscle forms the prime mover or the agonist.

The hamstring muscles of the posterior side of the upper thigh is a prime mover, helps in the flexion of the knee joint.

Antagonist muscles: They yield or support the prime movers by contracting hence regulating the movement of the prime movers from an opposite direction. It is located opposite to the prime movers.

Example is triceps muscle is the antagonist in flexion of the forearm.

Synergists: An assisting muscle which provides extra force to the prime movers at the same time helps in stabilizing at the joints; they are also called joint stabilizers.

example, while elbow flexion, the prime mover biceps brachialis is assisted by the muscle brachialis and hence called a synergist.

Fixator: Muscles which can immobilize or stabilize the origin of a prime mover so that it can function effectively.

example, the fixators muscles of the shoulder joint, helps to stabilize the scapula in place even while movements occur at the joints.

Step 4

Criteria for naming muscles with examples:

Muscles are named based on eight criteria.

According to their size (major, minor; Maximus, minimus for large and small respectively) example Gluteus maximus, Teres major, Teres minor etc.

based on their shape, trapezius muscle had a trapezoid shape, platysma is a flat muscle of the neck;

Based on orientation of fibers; rectus for parallel to the midline of the body .eg Rectus capitis posterior major.

flexors or extensors based on the mechanical action like the biceps and triceps.

From points of origin and insertion also a muscle gets named. Example, sternocleidomastoid has origins from the sternum and clavicles and insertion into the mastoid process

the function performed like masetter which helps in mastication or chewing function.

Based on the site or location they are named as femoris for muscle of the thigh or abdominis for muscles of the abdomen.

Similarly, Based on the number of origins or number of their heads they are called biceps, triceps, quadriceps. "Ceps" means heads.

The biceps brachii; the muscle of the arm has two points of origin. The triceps have three points of origin and the quadriceps has four points of origins.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.