The submental lymph nodes (or suprahyoid) are situated between the anterior bellies of the Digastrici.

Their afferents drain the central portions of the lower lip

Lower lip

The lower lip covers the anterior body of the mandible.It is lowered by the Depressor labii inferioris muscle....

 and floor of the mouth

Mouth

The mouth is the first portion of the alimentary canal that receives food andsaliva. The oral mucosa is the mucous membrane epithelium lining the inside of the mouth....

 and the apex of the tongue.

Their efferents pass partly to the submandibular lymph nodes

Submandibular lymph nodes

The submandibular lymph nodes , three to six in number, are placed beneath the body of the mandible in the submaxillary triangle, and rest on the superficial surface of the submaxillary salivary gland....

 and partly to a gland of the deep cervical group situated on the internal jugular vein

Internal jugular vein

The two internal jugular veins collect the blood from the brain, the superficial parts of the face, and the neck.-Path:On both sides and at the base of the brain, the inferior petrosal sinus and the sigmoid sinus join to form the internal jugular vein...

 at the level of the cricoid cartilage.

External links

• Image at umich.edu - must rollover
• http://www.med.mun.ca/anatomyts/head/hnl3a.htm
• Diagram at Baylor College of Medicine
  Baylor College of Medicine
  Baylor College of Medicine, located in the Texas Medical Center in Houston, Texas, USA, is a highly regarded medical school and leading center for biomedical research and clinical care...
  
  
• http://www.patient.co.uk/showdoc/27000835/
• http://www.emedicine.com/ent/topic306.htm#section~anatomy_of_the_cervical_lymphatics