General principles of skeletal muscle
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Transcript of General principles of skeletal muscle
General principles of skeletal muscle
Speaker,Dr. Md. Mohiuddin MasumMS Anatomy, Phase-A, Year-1, Block-1
Guided by,
Prof. Laila Anjuman BanuProfessor, Genetics & molecular biologyDept. of Anatomy, BSMMU
Objectives At the end of the session the audience will be able to-
Classify muscles and their location in the body. Connective tissue covering and different parts of
skeletal muscle. Classify different types of skeletal muscles. Explain different functional terms related to muscle
action. Understand and discuss some principles related to
skeletal muscles.
Muscular tissue
Is a basic tissue.
The word muscle is derive from a Latin word “musculus” which means little mouse.
All muscle of the body are derived from mesoderm. (Except, arrectores pilorum and muscle of the iris)
Classification of Muscle
Classification of Muscle (Morphologically)
Classification of Muscle (Functionally)
Connective tissue covering of Skeletal Muscle
Parts of Skeletal Muscle
Fleshy part.
Fibrous part. Tendinous. Aponeurotic.
Attachments of Skeletal Muscle
Less movement/ fixed end → Origin.
Greater movement/ movable end → Insertion.
Attachments of Skeletal Muscle(Contd.)
Muscles inserted near proximal end of a bone, close to a joint → Increase range of movement but less power of action. Example: Biceps brachii.
Attachments of Skeletal Muscle(Contd.)
Muscles inserted near proximal end of a bone, close to a joint → Increase range of movement but less power of action. Example: Biceps brachii.
Attachments of Skeletal Muscle(Contd.)
Muscles inserted near distal end of a bone, away from a joint → More power of action but less range of movement.Example: Brachioradialis.
Attachments of Skeletal Muscle(Contd.)
Muscles inserted near distal end of a bone, away from a joint → More power of action but less range of movement.Example: Brachioradialis.
Classification of skeletal muscle(According to colour)
Classification of skeletal muscle(Cont.)(According to direction of muscle fibre)
Classification of skeletal muscle (cont.)(According to direction of muscle fibre)
Classification of skeletal muscle (cont.)(According to direction of muscle fibre)
Direction of muscle fibres & function
Range of movement in muscle is directly proportional to the length of muscle fibres.
Parallel muscle
Long muscle fibres
↑ Range of movement
Oblique muscle
Short muscle fibres
↓ Range of movement
Direction of muscle fibres & function
Force of contraction of muscle is directly proportional to the number of muscle fibres.
Oblique muscle
More muscle fibres
↑ Force of contraction
Parallel muscle
Less muscle fibres
↓ Force of contraction
Muscle action• Prime mover
Muscle action(Cont.)
• Antagonist
Muscle action(Cont.)
Muscle action(Cont.)
• Fixator
Muscle action(Cont.)
• Synergist
Terms associated with skeletal muscle
• Hypertrophy
Hypertrophied MuscleNormal
MuscleHypertrophied Muscle
Terms associated with skeletal muscle (Cont.)
• Atrophy
Thank You