Transcript muscular tissue - UMK CARNIVORES 3

MUSCULAR
TISSUE
PROFESSOR DR. FAUZIAH OTHMAN
DEPARTMENT OF HUMAN ANATOMY
FACULTY OF MEDICINE AND HEALTH SCIENCE,
UNIVERSITI PUTRA MALAYSIA
3 Types of muscles

1. Skeletal

2.. Cardiac

3. Smooth
Muscle can be classified :

1. Functionally
- as to whether it is controlled
(voluntarily) or not (involuntarily)

2. Structurally
- as to whether it shows cross
(striations) or not (smooth)
Unique terms of components of
muscle cell
Sarcolemma
Sarcoplasm
Sarcoplasmic reticulum
Sarcosomes




Cell membrane
Cytoplasm
Smooth endoplasmic
reticulum
Mitochondria
Classification of muscle



Striated voluntary muscle
 this is skeletal, - it is attached to bone
Striated involuntary muscle or cardiac muscle
 found only in the heart and sometimes in the
walls of large blood vessels near the heart
Smooth involuntary muscle
 present in the walls of hollow organs (except
the heart), blood vessels and lymphatics.
A note on the use of the term
‘fibre’

A muscle fibre is a cell, the cytoplasm of
which is filled with contractile elements.

Connective tissue fibres are intercellular (i.e
extracellular) formations.

A nerve fibre is elongated part of a neuron.
Comparison of three type of muscle
Features
Skeletal
Cardiac
Yes
Smooth
Sarcomeres
Yes
No
Nuclei
Multinucleated; One or two:
One ; centrally
peripherally
centrally located located
located
Sarcoplasmic
reticulum
Well-developed Poorly defined;
with terminal
some small
cisterns
terminals
Some smooth
endoplasmic
reticulum (but
not involved in
calcium storage)
T tubules
Yes; small,
involved in
triad
formation
Cell junctions None
Yes; large,
involved in
diad
formation
none
Intercalated
disks
Involuntary ;
rhythmic and
spontaneous
Nexus (gap
junctions)
Involuntary;
slow and
forceful ; not
“all or none”
Contraction
Voluntary;
“all or none”
Calcium
control
Calsequestrin Calcium from caveolae
in terminal
extracellular
cisternae
sources
Calcium
binding
Troponin C Troponin C Calmodulin
Regeneration Yes, via
satellite
cells
None
Yes
Mitosis
No
Yes
No
Nerve fibers Somatic
motor
Autonomic Autoomic
Connective
tissue
Epimysium,
perimysium
and
endomysium
Connective
tuissue
sheaths and
endomysium
Connective
tissue sheaths
and
endomysium
Distinctive
features
Long,
Cylindershaped; many
peripheral
nuclei
Branched
cells;
intercalated
disks; single
nucleus
Fusiform
cells with no
striations;
one nucleus