OTOT

Dr. Charles A Simanjuntak, dr, SpOT(K), FICS, MPd

FKIK Universitas Jambi

2Charles2ASjuntak, FKIK-Unja

Charles2ASjuntak, FKIK-Unja 3Figure 7-11(b)

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Muscle Tissue Characteristics Excitability

Tissue can receive & respond to stimulatio

ContractilityTissue can shorten & thicken

ExtensibilityTissue can lengthen

ElasticityAfter contracting or lengthening, tissue

always wants to return to its resting state

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Muscle Tissue Functions

Movement – both voluntary & involuntary

Maintaining posture

Supporting soft tissues within body cavities

Guarding entrances & exits of the body

Maintaining body temperature

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Types of muscle tissue:

• Skeletal

• Cardiac

• Smooth (Visceral)

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Anatomy of skeletal muscles

Skeletal muscle

fiber (cell)

Muscle Fascicle

Surrounded by perimysium

Surrounded by endomysium

endomysium

perimysium

Skeletal muscle

Surrounded by epimysium

epimysium

tendon

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Microanatomy of a Muscle Fiber (cell)

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Microanatomy of a Muscle Fiber (Cell)

sarcolemma

transverse (T) tubules sarcoplasmic

reticulumterminal cisternae

myofibril

thin myofilament

thick myofilament

triad

mitochondria

nuclei

myoglobin

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Muscle fiber

myofibril

Thin filaments Thick filaments

Thin myofilamentMyosin molecule ofthick myofilament

sarcomere

Z-line

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Thin Myofilament

(myosin binding site)

Z-line (Z-disc)

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Thick myofilament

(has ATP & actin binding

site)

M-line

Play IP sliding filament theory p.5-14 for overview of thin & thick filaments

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Sarcomere

Z line Z line

A band

H zone

I band Zone of overlap M line

Zone of overlap

Thin myofilaments Thick

myofilaments

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OTOT RANGKA

• >400 otot rangka sebagai motor hidup– Gerakan aktif– Bentuk tubuh

• Kepala, badan, ekor• Origo dan insersi

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Anatomy of the Muscular System

• OriginMuscle attachment that remains

fixed• Insertion

Muscle attachment that moves• Action

What joint movement a muscle produces

i.e. flexion, extension, abduction, etc.

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Skeletal muscle movements at joints

• Flexion/extension

• Abduction/adduction

• Rotation – left/right; internal(medial)/external(lateral)

• Pronation/supination

• Elevation/depression

• Protraction/retraction

• Dorsiflexion/plantarflexion

• Inversion/eversion

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Contraction

• Isotonic• Isometric

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TENDON

• Substansi interseluler: collagen & fibroblas• Nutrisi & pendarahan minimal• Bentuk tali jaringan fibrotik, ujung otot• Synovial/tendon sheath gerak tendon

bebas

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LIGAMEN

• Substansi interseluler: collagen & fibroblas• Nutrisi & pendarahan minimal• Bentuk pita jaringan fibrotik• Penghubung tulang—tulang, t.rawan—

t.rawan• Penguat/penopang sendi

Question

?Charles2ASjuntak, FKIK-Unja 20