Question

multiple choice question

blood capillaries are able to reach every muscle fiber because they run extensively through which of the following?

perimysium
endomysium
fascia
epimysium

Explanation:

Identify the target structure surrounding individual muscle fibers

Using the Endomysium and Skeletal Muscle Connective Tissue knowledge points

• Individual skeletal muscle fibers (cells) are wrapped by a thin sheath of loose connective tissue called the endomysium.
• This innermost layer provides the immediate extracellular environment for each muscle fiber.

Locate the pathway for capillaries supplying individual fibers

Using the Endomysium knowledge point

• Blood capillaries and nerve fibers must reach every individual muscle fiber to supply oxygen, nutrients, and neural signals.
• These microscopic vessels run extensively through the endomysium, which directly surrounds each muscle fiber.

Differentiate from other connective tissue layers

Using the Perimysium, Epimysium, and Fascia Anatomy knowledge points

• The perimysium surrounds bundles of muscle fibers (fascicles) and contains larger blood vessels.
• The epimysium surrounds the entire muscle belly.
• Fascia is a coarser sheet of connective tissue grouping muscles together.
• Therefore, only the endomysium allows capillaries to directly contact and wrap around individual muscle fibers.

Answer:

• Perimysium
• Endomysium (Correct answer)
• Fascia
• Epimysium