Which connective tissue sheath covers the entire skeletal muscle?

Appeared in: HSSC Staff Nurse - 2015

Explanation

The epimysium is the outermost connective tissue layer that encases the entire skeletal muscle.
It is a dense, irregular connective tissue that protects the muscle from friction and helps to maintain its structural integrity.
The epimysium separates the muscle from surrounding tissues and organs.
It is continuous with the perimysium, endomysium, and the tendon that attaches the muscle to bone.

Option A: Endomysium is the delicate connective tissue sheath that surrounds each individual muscle fiber (cell), not the entire muscle.
Option B: Perimysium is the connective tissue that bundles groups of muscle fibers into fascicles. It does not cover the entire muscle.
Option D: Periosteum is the connective tissue membrane that covers the outer surface of bones, not muscles.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of skeletal muscle connective tissue layers as background academic context rather than a clinical decision trigger.
Understanding the muscle's connective tissue layers is crucial for diagnosing and treating muscle injuries like strains, which involve tearing of these tissues.
Compartment syndrome is a serious condition where swelling within a muscle compartment, defined by the fascia (including the epimysium), increases pressure and restricts blood flow. Nurses must monitor for signs like severe pain, pallor, and pulselessness.
These connective tissue sheaths are continuous with tendons. Therefore, inflammation or injury to the tendon (tendinitis) can also affect the muscle's fascial layers.

How to Approach the Question

This is a factual recall question from anatomy.
First, identify the key terms in the question: "connective tissue sheath" and "entire skeletal muscle".
The question asks for the covering of the whole muscle.
Recall the three layers of connective tissue in a muscle: endomysium, perimysium, and epimysium.
Remember the hierarchy: 'Epi-' means 'upon' or 'outermost', 'Peri-' means 'around', and 'Endo-' means 'within'.
Epimysium covers the entire muscle. Perimysium covers fascicles (bundles of fibers). Endomysium covers individual fibers.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e p. 315-317

E6 Physiology Ganong 27e Vol 2 Part 3 p. 76-78

Practise the full HSSC Staff Nurse - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.