Deltoid muscle is found on the uppermost part of the arm. It covers the top of the shoulder joint. It resembles an equilateral triangle in shape. This muscle helps in the movement and rotation of the neck and mainly it provides stability to the shoulder blade. It helps in the lifting and twisting of the […]
Trapezius muscle is found in the upper and back portion of the neck, shoulders and chest. This is one of the vital muscles of the upper part of the back. It is a large triangular muscle. It extends from the uppermost point of the neck to the spine and the shoulder blade region. The main
EpicraniusMuscles The muscles that cover the skull are the epicranius muscles. The epicranius muscles are comprised of two muscles: the frontalis muscle and the occipitalis muscle. The muscle located on the forehead is the frontalis muscle, while the occipitalis muscle is located on the right and the left side of the skull on the back
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Smooth muscles are also called visceral muscles as they are present in the internal organs of the body, such as blood vessels, the gastrointestinal tract, the bladder or the uterus. These muscles are responsible for the contraction/movement of the internal organs. The smooth muscles are the weakest muscles and are controlled by the brain. The
Skeletal muscles are the only voluntary muscles in the body. These muscles are connected with the skeleton, hence are called skeletal muscles. These muscles are composed of striated muscle tissues. Somatic nervous system is responsible for every action of these muscles. This is the reason why these are called voluntary muscles. These muscles are usually
Cardiac muscle is a unique type of muscle that is found only in the heart. These muscles are formed by specialised muscle tissues, composed of striated cells. These cells help the heart to pump the blood to the entire body. The pumping of blood is possible due to the contraction of the heart muscles. These
Muscles consist of several muscle bundles. These muscle bundles are composed of several muscle fibres or myocytes. They are held together by a layer of connective tissue and are lined by sarcolemma. Each muscle fibre is composed of several parallely arranged strands called myofibrils. The myofibrils contain two important proteins: actin and myosin. The striated
The muscular system is mainly responsible for the movement of the body. The muscles help carry out everyday activities such as walking and sitting. This system supports maintenance of the posture and stability of the joints. The muscles in the body help generate heat necessary for various metabolic functions. There are more than six hundred
A saddle joint has an interesting arrangement of bones in it. In this joint, one bone is shaped like a saddle with the other bone resting on it like a rider on a horse. These joints are much balanced and stable joints as compared to the hinge joint. The best example of a saddle joint
In a pivot joint, one bone moves without disturbing other bones. This joint is found between the head and the neck. This joint is also called the rotatory joint that allows only rotational movement, as in case of the movement of the head. One can turn one’s head from right to left or from left
The other class of synovial joints are the hinge joints. A hinge joint works like a hinge fixed to a door or window. A hinge joint allows bones to move in one direction, that is only a backward and a forward motion. In the human body, we can find the hinge joints between the bones
A gliding joint is also referred as a plane or planar joint in which two flat surfaces of a bone move smoothly on each other. In this type of joint, the connecting surfaces of the involved bones are flat or slightly curved. These joints allow only gliding movement. These are found between the carpal bones
The ball and socket joint or sphere-shaped joint is a joint in which one of the bones is round like a ball. The round bone fits into another bone which resembles a socket. The round bone rotates within the socket bone. This type of joint permits the bone to move in all directions. The two
The synovial joints are the freely movable joints. The characteristics of a freely movable joint are: (1) the ends of bones which enter into the formation of the joints are covered by hyaline cartilage. (2) Ligaments are required to bind the bones together. (3) There is a joint cavity that is enclosed by a capsule
Cartilaginous joints are slightly movable joints in which the joint surfaces are joined by cartilages. The joints between the vertebrae in the spine and joints between the ribs are the common examples of the cartilaginous joints. The injury in the cartilage causes pain in the cartilaginous joints. The pain in the joints and stiffness is