pharynx

1. Pharynx
Part 2

2. Pharyngeal plexus of nerve
Formed by union of pharyngeal branches of vagus
and glossopharyngeal and the laryngopharyngeal
branch of superior cervical sympathatic ganglion
Lying in connective tissue(buccopharyngeal
fascia,superficial to constrictor muscles,especially
middle constrictor

4. Nerve supply
Glossopharyngeal supplies sensory fibers for
mucous membrane of oropharynx and
parasympathetic (secretomotor) fibers to the glands
of this region
The pharyngeal branch of vagus carries motor fibers
for the muscles of pharynx except (stylopharngeus)
and soft palate (except the tensor).

5. Nerve supply
Mucous membrane of nasopharynx and laryngopharynx
is not innervated by pharyngeal plexus
Nasopharynx is supplied with general sensory
(trigiminal) and postganglionic parasympathetic
(originally facial) fibers through pharyngeal branch of
pterygopalatine ganglion
The laryngopharynx receives its sensory and
parasympathetic innervation through internal and
recurrent laryngeal branches of vagus

6. Blood supply
The pharynx receives blood from ascending pharyngeal
branch of external carotid artery
The ascending palatine and tonsillar branches of facial
artery
The greater palatine and pharyngeal branches of maxillary
t
Branches of lingual artery and from superior and inferior
laryngeal branches of superior and inferior thyroid artery
Lymphatic drainage through retropharngeal nodes

7. Relationships of pharynx
Posteriorly contact prevertebral fascia
The small amount of loose connective tissue between fascia
and pharyngeal wall called retropharngeal space
Anterior relationships of pharynx from above downwards:
(posterior nasal apertures,soft palate,oral cavity,posterior
surface of tongue , epiglottis and larynx)
Laterally pharynx related to carotid sheath ,styloid
apparatus,glossopharyngeal nerve and pharyngeal and
superior laryngeal branch of vagus