Muscle Tissue. What is Muscle Tissue? Composed of cells that are highly specialized to shorten in length by contractility. Made up of cells that are called.

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Presentation transcript:

Muscle Tissue

What is Muscle Tissue? Composed of cells that are highly specialized to shorten in length by contractility. Made up of cells that are called myocytes. Elongated in one direction (muscle fibres).

Special Terms Plasma MembraneSarcolemma CytoplasmSarcoplasm Smooth Endoplasmic Reticulum Sarcoplasmic MitochondriaSarcosomes

Types of Muscles Smooth Muscle Skeletal Muscle Cardiac Muscle

Skeletal Muscle Striated or voluntary muscle Present mainly in limbs and in relation to body wall. Elongated, Cylindrical, multinucleated cells Varies in length from a few mm to few cm. Alternate dark & light bands (cross-striations). Mostly originate from somatic mesoderm Basic unit is long, cylindrical fiber

General Architecture Skeletal Muscle fibres are supported by Connective Tissue framework, well appreciated in cross section of a muscle EpimysiumEntire Muscle PermysiumBundles of Muscle fibres Endomysium- Individual muscle fibre

Skeletal Muscle Fibres are arranged parallel to each other. Formed by fusion of multiple myoblasts during embryonic life. Myofibrils: contractile elements Sarcomere: fundamental contractile unit Myofilaments: contain thick (myosin) and thin (actin) filaments

Skeletal Muscle Nerve supply: Motor fibres Sensory fibres

Skeletal Muscle

Cardiac Muscle Striated and involuntary Present exclusively in heart Originates in splanchnopleuric mesoderm Supplied by ANS (sympathetic & parasympathetic)

Microscopic structure of Cardiac Muscle Consists of long and thick branching muscle fibres Intercalated discs- specialized cell junctions These junctions are gap junctions & Desmosomes Acts as a FUNCTIONAL SYNCYTIUM Centrally placed single oval nucleus Faint transverse lines Supplied by ANS (sympathetic & parasympathetic)

Cardiac Muscle

Smooth Muscle Spindle elongated cells 30 micron in length micron length in pregnancy Non-striated, involuntary Supplied by Autonomic Nervous System

Smooth Muscles Adjacent smooth muscle cells are in contact with each other through gap junctions which help to transmit the electric impulses from one cell to another. Spindle shaped cells Centrally placed oval nucleus

Smooth Muscle

Connective tissue frame work

Muscle Tissue

Muscle Mesodermal in origin C omposed predominantly of Specialized cells which shorten in length by contraction and this is how they bring about Movement

Muscle Muscle fibres are elongated cells which contain contractile proteins, mainly Actin and Myosin. Interaction between these proteins bring about contraction.

Other Contractile Cells Myoepithelial cells Myofibroblasts

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