Chapter 8: Head & Neck: Cranial, Cervical & Facial Anatomy

Head & Neck: Cranial, Cervical & Facial Anatomy provides an in-depth anatomical analysis of the head and neck, exploring the complex relationships between the skeletal framework, muscular systems, neurovasculature, and visceral compartments essential for vital functions. The text begins with a detailed examination of the skull, categorizing the twenty-two bones into the cranium and facial skeleton, while explaining key osteological features such as sutures, fontanelles, and the cranial fossae. It outlines the intricate organization of the neck, dividing it into vertebral, visceral, and vascular compartments enclosed by unique layers of deep cervical fascia, including the investing, pretracheal, and prevertebral layers. Significant attention is given to the cranial meninges—dura, arachnoid, and pia mater—and the dural venous sinuses, along with the arterial supply to the brain via the internal carotid and vertebral arteries forming the cerebral arterial circle. The chapter systematically reviews the twelve pairs of cranial nerves, detailing their functional components, pathways, and innervation targets. Regional anatomy is extensively covered, describing the muscles of facial expression and mastication, the temporomandibular joint, and the distinct boundaries and contents of the temporal, infratemporal, and pterygopalatine fossae. The specialized organs of the head are explored, including the orbit and eye, the external, middle, and internal ear, and the lacrimal apparatus. Furthermore, the text elucidates the anatomy of the upper respiratory and digestive tracts, breaking down the nasal cavities and paranasal sinuses, the oral cavity with its associated salivary glands and teeth, and the pharynx and larynx. Detailed descriptions of the pharyngeal constrictors, laryngeal cartilages, and intrinsic muscles explain the mechanisms of swallowing and phonation. The chapter concludes with the surface anatomy and lymphatic drainage of the region, emphasizing the clinical significance of the anterior and posterior triangles of the neck.