Investing Layer Fascia — MFDS Part 1 MCQ
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Correct answer: E — Sternocleidomastoid and trapezius
The correct answer is E. In the conventional topographical classification, the investing layer is the most superficial component of the deep cervical fascia. It splits to ensheath the sternocleidomastoid and trapezius and forms the fascial roof of the posterior triangle. Masseter and temporalis are enclosed by fasciae associated with the muscles of mastication, while the pterygoids lie within the infratemporal region. Mylohyoid, geniohyoid and both bellies of digastric are suprahyoid muscles and are not the defining muscular contents enclosed by the investing layer. Although detailed anatomical studies dispute whether this fascia constitutes a complete continuous sheet, sternocleidomastoid and trapezius remain the accepted answer under the conventional description used in UK surgical anatomy teaching.
Reference: Severn Deanery NHS, Core Training: Clinical Anatomy and Physiology — Surgical Anatomy: Head, Neck and Neuroanatomy, Anatomy of the Neck, 2012. https://surgery.severndeanery.nhs.uk/assets/Uploads/head-neck-objectives2.pdf