Pain In Left Shoulder From Cold Drink

Nerve Tissue Connective Tissue Muscle tissue

Muscle tissue is responsible for the body movements. It consists of elongated cells called muscle fibers, characterized by presence of large numbers of cytoplasmic filaments.

is characterized by its contractility. is formed by elongated cells, also called muscle fibers. It originates from the mesoderm.

muscle fibers are limited outside a membrane called the sarcolemma. the cytoplasm called sarcoplasm is striated by the presence of myofibrils.

We can say that muscle tissue is a group or complex histological, because in addition to the type of muscle cells also have a tissue component conjunctive.

There are two types of myofibrils:

• Smooth, homogeneous structure.

• Ridged: heterogeneous for the presence of disks light and dark alternate regularly.

myofibril Depending on the make up muscle fiber can be:

• smooth muscle fiber.

• striated muscle fiber.

• Muscle fiber heart

muscle Classification:
According to their morphological and functional is classified as

• Striated or skeletal muscle:

• Formed by bundles of cylindrical cells very long and multinucleate presenting transverse striations.

• have fast twitch, vigorous and subject to Voluntary Control.

• Smooth muscle:

• Formed by clusters of spindle cells have no cross striations.

• Your contractions are slow and are not subject voluntary control.

• cardiac striated muscle:

• Formed by elongated and branched cells.

• These are attached longitudinally to neighboring forming a network.

• Your contractions are vigorous, involuntary and rhythmic.

striated muscle tissue or skeletal muscle:

Formed by striated muscle fibers, which are cells cilindroides , unbranched, longer than 1 to 4 cms of length. With many nuclei peripherals.

Organization Musculoskeletal:

• The bundles of muscle fibers are wrapped in a membrane called epimysium .

• From epimisio start dividing walls to beams in installments and this partition is called perimysium .

Each muscle fiber is enveloped by a layer of reticular fibers called endomysium .

penetrate the muscle capillaries through connective septa.



flattened nuclei and peripherals are under the sarcolemma (plasma membrane of the muscle cell).

• cytoplasm or sarcoplasm area around the nuclei and myofibrils.

All of this together in structures called Leydig cylinders or columns of Kölliker.



skeletal muscle tissue myofibrils and filaments have many heterogeneous.
Most of the organelles and sarcoplasm (cytoplasm) are close to the poles of the nuclei.

The sarcoplasm contains many mitochondria or sarcosomas , glycogen granules and a protein called oxygen-binding myoglobin .
The endoplasmic reticulum in these cells is called sarcoplasmic reticulum . It consists of a membrane system that extends throughout the muscle fiber and is attached at some sites to the sarcolemma. is related to the propagation of the wave of excitement that causes contraction of the fiber.

filaments in cells or muscle fibers may be:

-thin filaments.

• Actin .

• Tropomyosin .

• Troponin .

-Fiber Thick:

• Myosin .

These filaments form the Myofibrils that are cylindrical structures that are distributed longitudinally occupying almost the entire interior muscle fiber.

• Myofibrils are arranged parallel to the axis fiber that contains them.

• They consist of two substances that in the form of records regularly called alternative bands.

• Banda or disk A: dark filaments formed by myosin . This presented in its middle a zone clear close call Striae of or disk Hensen H.

• Banda or disk I: filaments composed of actin . It surpasses in part and interdigitates with strands of myosin without the band H. This presented in this medium

  a dark area called Disco Z.

All these structures together in structural and functional unit called muscle: Sarcomere .

Striated Muscle Tissue Cardiac

• formed by spindle cells, forming columns that irregularly anastomose or join. Unlike skeletal fibers have only one or two core areas. The direction of cardiac fibers is very irregular . The columns are covered by a thin sheath of connective tissue, equivalent to endomysium of skeletal muscle.

heart muscle fiber is very similar to skeletal but has more sarcoplasm, mitochondria and glycogen.

Myofibrils are not arranged in bundles, are distributed throughout the sarcoplasm .

At the junction between two fibers is a line dark cross called intercalated disks and represent specialized areas for the union.

cardiac muscle fiber has the same bands A, I, H and Z of the skeleton but not the filaments are A bundle but form a large mass.

The sarcoplasmic reticulum is less developed in these cells compared with that of skeletal muscle fibers.

smooth muscle:

This association consists of large cells and spindle layered above in walls of hollow organs (intestines, vessels).

• smooth muscle Other locations are:

• Connective tissue surrounding:

• Prostate.

• seminal vesicles.

• The subcutaneous tissue:

• Scrotum.

• Nipples.

• erector muscle of hair.

• Uterus.

smooth muscle fibers are coated and bonded together by a network of reticular fibers The smooth muscle cell is also coated externally by a layer glycoprotein amorphous ( glycocalyx).

has been shown that smooth muscle cells also contractile capacity, can also synthesize collagen type III fibers elastic and proteoglycans.



functions of muscle tissue.
Participate in all body movements

• Volunteers (skeletal muscle)
• Involuntary (smooth muscle, cardiac striated muscle).