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Muscle Types
• Skeletal
• Smooth
• Cardiac
• Until further notice, we are discussing
skeletal muscle
Connective Tissue in Skeletal
Muscle
• Tendon: attaches
muscle to bone
• Fascia: layers of
connective tissue that
separates an
individual muscle
from adjacent
muscles. Holds
muscle in position.
Connective Tissue in Skeletal
Muscle
• Epimysium: layer of
connective tissue that
directly surrounds the
skeletal muscle
• Perimysium: layer of
connective tissue that
extends inward and
separates a muscle
into fascicles
Connective Tissue in Skeletal
Muscle
• Fascicle:
compartment that
contains a bundle of
muscle fibers
• Endomysium:
connective tissue that
surrounds an
individual muscle
fiber(cell) in the
fascicle
Connective Tissue in Skeletal
Muscle
• Myo• Sarco-
• See Figure 9.2 and 9.3
• Draw circles
• Practice with junk
Muscle Fiber (Cell) Structure
• A muscle fiber is an
elongated single cell
of a muscle
• See Figure 9.2 and
9.7 (8.2 and 8.4)
Muscle Fiber (Cell) Structure
• Sarcolemma: cell
membrane of a
muscle cell
• Sarcoplasm:
cytoplasm of a
muscle cell, contains
many nuclei and
mitochondria
Muscle Fiber (Cell) Structure
• Nuclei: many per cell,
site of transciption
• Mitochondria: many
per cell, site for
Cellular respiration
Muscle Fiber (Cell) Structure
• Transverse Tubules:
(T tubules), tubes that
extend inward and
pass all the way
through the cell. Each
tube opens to the
outside
Muscle Fiber (Cell) Structure
• Sarcoplasmic
Reticulum: SR,
network of channels
in the sarcoplasm.
These run parallel to
the myofibrils.
Muscle Fiber (Cell) Structure
• Myofibrils: threadlike
structures that lie
parallel to each other
in the sarcoplasm
– Major function is
muscle contraction
Muscle Fiber (Cell) Structure
• Draw
• Practice
• Junk
• Figure 9.7
Myofibril Structure
• Remember: Myofibrils
are threadlike
structures that lie
parallel to each other
in the sarcoplasm.
Their major function is
muscle contraction
Myofibril Structure
• Made of 2 types of
filaments(proteins):
– Actin: thin filament, it
appears light
– Myosin: thick filament,
it appears dark
Myofibril Structure
• A Band: darkest area
where actin and myosin
overlap.
• H Band: part of A band,
lighter area because only
made of myosin and M
line.
• M Line: structural protein
that anchors the myosin.
Myofibril Structure
• I Band: lightest band;
only actin and Z line.
• Z Line: structural
protein that anchors
the actin.
• Sarcomere: Z line to
Z line; is a contractile
unit
Myofibril Structure
• See Figure 9.4 and 9.5 or 9.6
• Draw
• Practice
• Build