Struktur Sel Otot Rangka


Anatomi otot

Lapisan paling luar dari otot rangka adalah epimesium yang merupakan jaringan ikat padat yang juga menghubungkan dengan tulang dan membentuk bangunan yang disebut dengan tendon. Epimesium melindungi otot dari gesekan dengan otot yang lain juga dengan tulang.

Dari gambar di bawah ini Anda dapat melihat bahwa sebuah otot disusun oleh banyak berkas otot sedangkan sebuah berkas otot tersusun atas banyak serabut otot. Pada otot agar tidak bersinggungan dengan otot lain dilindungi dengan epimesium sedangkan berkas otot dilindungi oleh fasia sehingga disebut fasikula. setiap fasikula terdiri dari 10-100 serabut otot.

Muscle cell structure

A large strong muscle, such as thoses forming your Quadriceps would have a large number of fibers within each bundle. A smaller muscle used for precision movement, such as those in the hand would contain far fewer fibres per Fasciculi.

Muscle fibers

Looking at each muscle fiber in detail, you can see they too are covered in a fibrous connective tissue, known as Endomysium which insulates each muscle fiber. Muscle fibers can range from 10 to 80 micrometers in diameter and may be up to 35cm long.

Beneath the Endomysium and surrounding the muscle fibre is the Sarcolemma which is the fibres cell membrane and beneath this is the Sarcoplasm, which is the cells cytoplasm, a gelatinous fluid which fills most cells.

This contains Glycogen and Fats for energy and also Mitochondria which are the cells powerhouses, inside which the cells energy is produced.

Each muscle fiber itself contains cylindrical organelles known as Myofibrils. Each muscle fiber contains hundreds to thousands of Myofibrils. These are bundles of Actin and Myosin proteins which run the length of the muscle fiber and are important in muscle contraction.

Surrounding the Myofibril there is a network of tubules and channels called the Sarcoplasmic Reticulum in which Calcium is stored which is important in muscle contraction. Transverse tubules pass inwards from the Sacrolemma throughout the Myofibril, through which nerve impulses travel.

Each Myofibril can then be broken down into functional repeating segments called Sarcomeres. For more information on sacomeres and how muscles contract take a look at sliding filament theory.

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