Lymphatic system is part of the defense system against microorganisms and other substances. It helps to maintain fluid balance in tissues and to absorb fats from the digestive tract.Functions: Fluid balance Fat absorption Defense
The lymph nodes of the head and neck are arranged as a regional collar that extends from below the chin to the back of the head and as a deep vertical terminal group that is embedded in the carotid sheath in the neck.
Node Location Structures drainedOccipital Occipital bone on Back of the scalp the back of the skullRetroauricular Behind the ear over Scalp over the ear,(mastoid) the mastoid process the auricle, andParotid On or within the Scalp above the parotid salivary parotid gland, the gland eyelids, the parotid gland, the auricle, and the external auditory meatus
Node Location Structures drainedBuccal (facial) Cheek over the Drain the lymph buccinator muscle that ultimately passes into the submandibular nodesSubmandibular Lie superficial to the Front of the scalp, thenodes submandibular nose, the cheek, the upper lip, the lower lip gland just below the (except the central lower margin of the part), the frontal, jaw maxillary, and ethmoid sinuses, the upper and lower teeth (except the lower incisors), the anterior 2/3s of the tongue, the floor of the mouth and vestibule, and the gums
Node Location Structures drainedSubmental Submental triangle Tip of the tongue, the below the chin floor of the anterior part of the mouth, the incisors, the central part of the lower lip. And the skin over the chin.Anterior cervical Lie along the course The skin and of the anterior superficial tissues of jugular vein in front the front of the neck of the neckSuperficial cervical Lie along the course Skin over the angle of of the external the jaw, skin over the jugular vein lower part of the parotid gland, and the lobe of the ear
Node Location Structures drainedRetropharyngeal Lie behind the The nasopharynx, pharynx and in front the auditory tube, of the vertebral and the vertebral column columnLaryngeal In front of the larynx larynxTracheal Alongside the Neighboring(paratracheal) trachea structures, including the thyroid gland
- Form a vertical chain along the course ofthe internal jugular vein within the carotidsheath. - receive the lymph from all the groups ofregional nodes. - efferent lymph vessels from the deepcervical nodes join to form the jugular trunk,which drains into the thoracic duct or rightlymphatic duct.
Node Location Structures drainedJugulodigastric node Below and behind Tonsil and the tongue the angle of the jawJugulo-omohyoid Close to the tonguenode omohyoid muscle