histology of muscle · histology of muscle 1. skeletal, striated, voluntary muscle: nucleus pushed...
TRANSCRIPT
Histology of Muscle
1. Skeletal, Striated, Voluntary Muscle:
Nucleus pushed to one side of cells
2. Smooth, Unstriated, Involuntary Muscle:
Nucleus in center of cell
3. Cardiac, Striated, Involuntary; Nucleus in
center of branching & anastomosing cells
and cells connected by intercalated
discs(desmosomes and gaps) specialized
cells conduct messages to contract (Purkinje
cells)
Skeletal (Voluntary, Striated)
MuscleSkeletal, Striated, Voluntary Muscle:
Nucleus pushed to one side of cells
Nucleus
Nucleus
~2,000X
1.5um
plastic
section
c
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Z
I
A
H (& M)
A
I
Z
one sarcomere
Z
I
A
H (& M)
A
I
Z
N
u
c
l
e
u
s
C
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H
Sarcomere shortened =
contraction
ACTIN
MYOSIN
MYOSIN
Motor end plates terminating on muscle fibers
Nerve fibers
External alligator
musculature (Skeletal)
Massive
Pterygoideus m.
Cardiac (Involuntary) Muscle:
only in HEART
Cardiac, Striated, Involuntary; Nucleus in
center of branching & anastomosing cells
and cells connected by intercalated
discs(desmosomes and gaps) specialized
cells conduct messages to contract
(Purkinje cells)
L RInterventricular
Septum
(Posterior)
Bicuspid
Valve
Left Atrium
Thick
myocardium
Thin
myocardium
Tricuspid
Valve
Apex
Papillary
Muscle
Chordae Tendineae
Right Atrium w/
Pectinate Musc.
Pumps
blood to
Body
Pumps blood to
Lungs through
Pulmonary Arteries
Cardiac Muscle (Involuntary):
yellow arrows = intercalated Discs
Nucleus
Nuclei
Cardiac Muscle (Involuntary):
yellow arrows = intercalated Discs
Cardiac Muscle (Involuntary):
yellow arrows = intercalated Discs
SA node to AV node to
interventricular septum
Smooth (Involuntary) Muscle –
Digestive Tube, Urinary and
Reproductive system and
Arteries, etc..
Smooth, Unstriated, Involuntary Muscle:
Nucleus in center of cell
mesentery
serosa
Outer Longitudinal smooth muscle
Ganglion cells
of ANS
Lamina
propria Muscularis
mucosa
Lymphoid
tissue
Submucosa
Submucosal
Gland
saMucosa
Inner Circular smooth muscle
External gland e.g.
Pancreas
Stratified Squamous to
Columnar Epithelium true
ectoderm
Smooth muscle
in uterine tube
cilia
Smooth muscle
in uterine tube
Note elongate, spindle-shape cells & elongate, centrally located nuclei
Circular & Longitudinal Muscle of GUT
tube (Stomach)
Muscularis Mucosa
is also Smooth M.
Smooth muscle (outer longitudinal, middle circular and
inner longitudinal) in URETER wall
Connective
Tissue of
Mucosa=
L.P.