Muscular System

Question 1

Skeletal Muscles

Answer 1

Skeletal muscle, also called voluntary muscle, in vertebrates, most common of the three types of muscle in the body. Skeletal muscles are attached to bones by tendons, and they produce all the movements of body parts in relation to each other. Unlike smooth muscle and cardiac muscle, skeletal muscle is under voluntary control. Similar to cardiac muscle, however, skeletal muscle is striated; its long, thin, multinucleated fibres are crossed with a regular pattern of fine red and white lines, giving the muscle a distinctive appearance

Question 2

Smooth muscle

Answer 2

smooth muscle - a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

Question 3

Cardiac Muscle

Answer 3

Definition of cardiac muscle. : the principal involuntary-muscle tissue of the vertebrate heart made up of striated fibers joined at usually branched ends and functioning in synchronized rhythmic contraction.

Question 4

Myoepithelial Cells

Answer 4

Myoepithelial cells (sometimes referred to as myoepithelium) are cells usually found in glandular epithelium as a thin layer above the basement membrane but generally beneath the luminal cells. These may be positive for alpha smooth muscle actin and can contract and expel the secretions of exocrine glands

Question 5

Skeletal muscle

Answer 5

Skeletal Muscles are those which attach to bones and have the main function of contracting to facilitate movement of our skeletons. They are also sometimes known as striated muscles due to their appearance. The cause of this ‘stripy’ appearance is the bands of Actin and Myosin which form the Sarcomere, found within the Myofib

Question 6

Masseter muscle

Answer 6

The masseter muscle is a thick quadrilateral muscle located in the cheek. It is needed for mastication (chewing) and performs when it closes the jaws. It is made up of two parts: superficial and deep. The larger, superficial portion comes up by a wide tendinous aponeurosis from the zygomatic process of the maxilla, and from the anterior two-thirds of the bottom lower border and deep surface of the zygomatic arch.

Question 7

Levator Scapulae Muscle

Answer 7

The levator scapulae muscle resides at that back and side of the neck. Levator means to lift in Latin, so as the name implies, its goal is to lift the scapula. It comes up by tendinous slips from the transverse processes of the atlas and axis and from the posterior tubercles of the transverse processes of the third and fourth cervical vertebrae

Question 8

Platysma Muscle

Answer 8

The platysma muscle is a broad sheet of muscle arising from the pectoral (chest) and deltoid (shoulder) muscles and rises over the collarbone (clavicle), proceeding upward in a slanting manner along the sides of the neck.

Question 9

Trapezius Muscle

Answer 9

The trapezius is one of the major muscles of the back and is responsible for moving, rotating, and stabilizing the scapula (shoulder blade) and extending the head at the neck. It is a wide, flat, superficial muscle that covers most of the upper back and the posterior of the neck.

Question 10

Zygomaticus Major Muscle

Answer 10

The zygomaticus major muscle is one of two zygomaticus muscles, the zygomaticus minor and zygomaticus major, which are two facial muscles that aid in articulation of the mouth, nose, and cheeks.

Question 11

Orbicularis Oris Muscle

Answer 11

The orbicularis oris muscle is a sphincter muscle that encircles the mouth. It lies between the skin and the mucous membranes of the lips, extending upward to the nose and down to the region between the lower lip and chin.

Question 12

Orbicularis Oculi Muscle

Answer 12

The orbicularis oculi muscle is a ringlike band of muscle, called a sphincter muscle, that surrounds the eye. It lies in the tissue of the eyelid and causes the eye to close or blink

Question 13

Depressor Anguli Oris Muscle

Answer 13

The depressor anguli oris is a muscle that originates from the mandible and inserts on angles of the mouth to depress the angle of the mouth.

Question 14

Clavicular Head of Sternocleidomastoid Muscle

Answer 14

The clavicular head of the sternocleidomastoid muscle is the more lateral and posterior of the two heads of origin of the sternocleidomastoid muscle. It connects the skull to the clavicle and allows the head to flex or rotate

Question 15

Risorius Muscle

Answer 15

The risorius muscle draws the angle of the mouth outward and is commonly called the laughing muscle.

Question 16

Scalene Muscles

Answer 16

The scalene muscles are lateral vertebral muscles that begin at the first and second ribs and pass up into the sides of the neck.

Question 17

Galea Aponeurotica

Answer 17

The galea aponeurotica is a muscle that covers the upper part of the cranium (skull). Its attachment to the frontal and occipital bellies (muscles on the brow at the front and on the upper back of the head) allows it to move the scalp freely over the underlying skull bone.

Question 18

Zygomaticus Minor Muscl

Answer 18

The zygomaticus minor muscle is one of two zygomaticus muscles, the zygomaticus minor and zygomaticus major, which are two facial muscles that aid in articulation of the mouth, nose, and cheeks.

Question 19

Depressor Labii Inferioris Muscle

Answer 19

The depressor labii inferioris muscle is a muscle of the face that draws the lower lip down and slightly laterally, as in the expression of irony.

Question 20

Temporalis Muscle

Answer 20

The temporalis muscle (or temporal muscle) is one of the mastication muscles; if you clench and unclench your jaw, you can see and feel it contracting at the temples on both sides of your head