Which of the following branches of the facial nerve supplies the risorius?Īnswer: C. Question 2. Anatomy, Embryology, and Histology QID 32572 The Anatomical Basis of Dentistry (2nd Edition). Sobatta, Atlas of Human Anatomy Volume 1, Head, Neck, and Upper Limb (12th Edition). These may join to form a common right lymphatic duct that empties to the right subclavian and internal jugular veins. On the right side, the jugular trunk joins the subclavian and broncomediastinal lymph trunks. On the left side, the jugular trunk joins the thoracic duct or may enter the junction of the subclavian vein and internal jugular vein independently. As part of the deep cervical vertical chain, they receive drainage from the superficial horizontal ring of nodes and the deep horizontal ring of nodes. The jugulodigastric nodes (Choice E) is also incorrect. They also drain into the upper group of the deep cervical nodes. The infrahyoid nodes receive drainage from the larynx, trachea, pharynx, and esophagus. The infrahyoid nodes (Choice D) is also incorrect.
They drain into the upper group of the deep cervical nodes. These nodes receive drainage from the posterior nasal cavity, nasopharynx, soft palate, middle ear, and external auditory meatus. The retropharyngeal nodes lie within the retropharyngeal space, which is the fascial space between the pharynx wall and the prevertebral fascia of the vertebral unit. The retropharyngeal nodes (Choice C) is also incorrect. The submental nodes subsequently drain to the submandibular nodes of the superficial horizontal ring and to the jugulo-omohyoid nodes of the deep cervical vertical chain. The lower lip, chin, tongue tip, and anterior floor of the mouth drain to it. Along with the submandibular lymph node, the submental lymph node is the other member of the superficial horizontal ring. The submental lymph node (Choice A) is incorrect. Finally, the deep cervical vertical chain consists of the jugulodigastric, jugular-omohyoid, and other cervical chain nodes. The deep horizontal ring includes retropharyngeal, paratracheal, pretracheal, prelaryngeal, and infrahyoid nodes. The superficial horizontal ring contains the submental and submandibular lymph nodes, and slightly deeper parotid nodes which include superficial deep preauricular nodes and retroauricular mastoid occipital nodes. There is a horizontal ring of superficial nodes, a horizontal ring of deep nodes, and a pair of vertical chains of deep cervical nodes (bilateral). The general schematic of lymph node chain layout can be grouped into three main chains. In our example, a maxillary tooth could drain to vessels through the infraorbital canal and then pass into a submandibular node, next passing to a jugulodigastric node of the deep cervical nodes. The submandibular nodes then drain to nodes of the deep cervical chain, paralleling the right and left internal jugular veins. Structures that drain to it include the submental nodes (which are also part of the superficial horizontal ring), cheek, nose, upper lip, maxillary teeth, vestibular gingivae, the hard palate mucosa and gingivae, posterior floor of the mouth, and the lateral aspects of the anterior two thirds of the tongue. The submandibular lymph nodes are part of the superficial horizontal ring of lymph drainage. Through which chain of lymph nodes will a severe infection of a maxillary tooth abscess drain? Sample NBDE I Practice Questions Question 1. Dental Anatomy and Occlusion QID 32946
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