Regional Anatomy of the Head and Neck (Regio Caput Colli)
📌 The practical anatomy session focuses primarily on the muscular system of the head and neck region.
🗺️ Key facial regions are named based on underlying structures, such as Regio Orbita (eye area), Regio Nasalis (nose area), and Regio Oris (mouth area).
📐 The neck region is divided into the Trigonum Colli Anterius and Trigonum Colli Posterius by the Musculus sternocleidomastoideus.

Muscles of Facial Expression (Innervated by N. Facialis, Cranial Nerve VII)
😀 Key facial muscles discussed include the Musculus frontalis, Musculus orbicularis oculi (around the eye), and Musculus orbicularis oris (around the mouth).
😊 Muscles related to smiling include the Musculus zygomaticus minor and major, and Musculus risorius.
👄 The Musculus buccinator is located deeper and is responsible for movements like blowing air from the mouth (e.g., blowing a trumpet).

Muscles of Mastication and Neck
🦷 The muscles of mastication (Musculi masticatores) are introduced, with the large, strong Musculus masseter highlighted as the outermost muscle used for chewing.
🦴 Neck musculature is categorized based on their attachment relative to the os hyoideum (hyoid bone) into suprahyoid (above) and infrahyoid (below) groups.
⚙️ Examples of suprahyoid muscles include the Musculus geniohyoideus and Musculus mylohyoideus (forming the floor of the mouth cavity).

Key Points & Insights
➡️ For comprehensive understanding, connect the anatomical structure (e.g., Orbicularis oculi) with its physiology/function (e.g., closing the eye).
➡️ Understanding muscle attachments allows logical derivation of names, such as Musculus sternohyoideus (attaching from sternum to hyoid) or Musculus thyrohyoideus.
➡️ The Musculus omohyoideus is a critical structure in neck surgery topography, defining important suprahyoid and infrahyoid regions.

📸 Video summarized with SummaryTube.com on Dec 15, 2025, 11:52 UTC