Muscle

A Composite Tissue

Epimysium Perimysium Endomysium

Muscle

Fiber

Fascicle art,

vein,

nerve

Skeletal

Muscle

Deep

Fascia

Tendon

Connective Tissue Wrappings

Connective Tissue Wrappings

Black arrow = Perimysium; Green arrows = Endomysium

Fluorescence

stained section

Green = Perimysium

Red = Myotubes

Skeletal Muscle

Skeletal Muscle

Myotubes w/ cross striations (A/I)

TEM of Skeletal

Muscle

High mag of a

sarcomere

TEM of a Skeletal Muscle Sarcomere

TEM of Skeletal Muscle in cross section

TEM of Skeletal

Muscle – t-tubule

and triads

SR = sarcoplasmic

reticulum

T = t-tubule

Mi = mitochondria

TEM of Skeletal Muscle Triad

TEM of a Myoneurojunction

Cardiac Muscle

Cardiac Muscle

High mag of Cardiac Muscle

TEM of Cardiac

Muscle and the

Intercalating Disk

1 & 3 = adherens

junctions

2 = lateral gap

junctions

TEM of Cardiac Muscle – lateral gap junctions

The Heart

Heart

Conducting

System

Purkinje fibers

High mag of Purkinje Fibers

TEM of Purkinje Fiber

Heart Valve Degeneration

Damage to valve leaflet edge by infection

Damage to valve leaflet edge and papillary

muscles by infection

Smooth Muscle

Smooth Muscle

Cross section

Longitudinal

section

Low mag TEM of Smooth Muscle

TEM of Smooth Muscle

Surface vesicles = caveolae Dense bodies & actin filaments