lunes, 26 de diciembre de 2011

Lymphatic drainage of the head and neck


INTRODUCTION
THE lymphatic tissue of the head and neck forms one third of the lymphatic tissue of the body
The lymphatic tissue of the head and neck is divided into the adenoid tissue and lymph nodes

1-the adenoid tissue
it is aggregation of lymphoid tissue which guards the entrance of the alimentary and respiratory system tracts
so it forms a ring called the lymphatic ring or circle called WALDEYER which includes:

1-superiorly:the nasopharyngeal tonsil at the roof and the posterior wall of the nasopharynx.
2-inferiorly: the lingual tonsil on the dorsum of the posterior third of the tongue
3-laterally: the palatine tonsils

drainage : efferent lymphatics from the Waldeyer ring drain into the upper deep cervical lymph nodes.
2-lymph nodes of the head and neck

(a)        superficial circular group
(b)       deep circular group
(c)        vertical chain inbetween the 2 circular group

these groups drain the superficial and the deep structures of the head and neck
the superficial and the deep circular groups drain into the vertical group which is called the deep cervical lymph nodes lying alongside the inf. Vena cava deep to the sternomastoid muscle.

(a)       the superficial circular lymph nodes of the head



Lymph nodes
Site
Area drained
Efferent lymphatics pass to
Occipital L.N
Occipital artery
1-post. Part of the scalp
2-the back of the neck
Upper deep cervical L.N
Post. Auricular L.N
Post.auricular vessels behind the auricle
1-post. Part of the scalp
2-auricle
3-external auditory meatus
Upper deep cervical L.N
Parotid L.N
Superficial to the parotid gland
1-temporal region
2-auricle
3-upper 1/2 of the face & eye lids
Upper deep and superficial cervical L.N
Buccal L.N
Facial vessels
On the buccinator and the mandible
1-the cheeks
2-the lips
Submandibular L.N

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