Head and Neck Anotomical


           

LEVEL CRANIAL CAUDAL ANTERIOR POSTERIOR LATERAL MEDIAL
Ia Geniohyoid m., plane tangent to basilar edgeof mandible Plane tangent to body of hyoid bone Symphysis menti, platysma m. Body of hyoid bone Medial edge of ant. belly of digastric m. n.a.a
Ib Mylohyoid m., cranial edge of submandibular gland Plane through central part of hyoid bone Symphysis menti, platysma m. Posterior edge of submandibular gland Basilar edge / innerside of mandible, platysma m., skin Lateral edge of ant. belly of digastric m.
IIa Caudal edge of lateral process of C1 Caudal edge of the body of hyoid bone Post. edge of submandibular gland; ant. edge of int. carotid artery; post. edge of post. belly of digastric m. Post. Border of int. jugular vein Medial edge of sternocleidomastoid Medial edge of int. carotid artery, paraspinal (levator scapulae) m.
IIb Caudal edge of lateral process of C1 Caudal edge of the body of hyoid bone Post. Border of int. jugular vein Post. border of the sternocleidomastoid m. Medial edge of sternocleidomastoid Medial edge of int. carotid artery, paraspinal (levator scapulae) m.
III Caudal edge of the body of hyoid bone Caudal edge of cricoid cartilage Postero-lateral edge of the sternohyoid m.; ant. edge of sternocleidomastoid m. Post. edge of the sternocleidomastoid m. Medial edge of sternocleidomastoid Int. edge of carotid artery, paraspinal (scalenius) m.
IV Caudal edge of cricoid cartilage 2 cm cranial to sternoclavicular joint Anteromedial edge of sternocleido-mastoid m Post. edge of the sternocleidomastoid m. Medial edge of sternocleidomastoid Medial edge of internal carotid artery, paraspinal (scalenius) m.
V Cranial edge of body of hyoid bone CT slice encompassing the transverse cervical vesselsb Post. edge of the sternocleidomastoid m. Ant. border of the trapezius m. Platysma m., skin Paraspinal (levator scapulae, splenius capitis) m.
VI Caudal edge of body of thyroid cartilagec Sternal manubrium Skin; platysma m. Separation between trachea and esophagusd Medial edges of thyroid gland, skin and ant.-medial edge of sternocleidomastoid m. n.a.
Retro- pharyngeal Base of skull Cranial edge of the body of hyoid bone Fascia under the pharyngeal mucosa Prevertebral m. (longus colli, longus capitis) Medial edge of the internal carotid artery Midline
a Midline structure lying between the medial borders of the anterior bellies of the digastric muscles
b for NPC, the reader is referred to the original description of the UICC/AJCC 1997 edition of the Ho's triangle. In essence, the fatty planes below and around the clavicle down to the trapezius muscle.
c for paratracheal and recurrent nodes, the cranial border is the caudal edge of the cricoid cartilage.
d for pretracheal nodes, trachea and anterior edge of cricoid cartilage

 

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