Point: 15. Superior Salivatory and Lacrimal Nuclei
Function:
Preganglionic parasympathetic cells that are involved in the
secretion of saliva from the submandibular and sublingual
glands, and secretion of tears from the lacrimal gland. Part
of C.N. VII.
Pathway:
Nuclei lie just MEDIAL to the motor VII (what nucleus lies
just medial to nuc. ambiguus?). Pregang. parasym. fibers
arising from the sup. saliv. nuc. DO NOT pass over the
abducens nucleus with motor VII axons, but instead pass
laterally to exit the pons with motor VII axons (would they
be affected by a lesion of the facial colliculus?). Axons
terminate in the submandibular ganglion, which contains
post. gang. para. cells that project to secretary cells in
the submandibular and sublingual glands. Pregang. para.
fibers arising in the lac. nuc. terminate in the pterygo
(spheno) palatine ganglion, which contains cells that proj.
to secretory cells in the lac. gland.
Deficits:
Lesion of superior salivatory and lacrimal nuclei results in
loss of saliva secretion from the IPSI. submandibular and
sublingual glands, and loss of tear secretion from IPSI.
lacrimal gland.
Other Note:
REMEMBER THAT MORE THAN ONE CELL GROUP IS INVOLVED IN THE
PRODUCTION OF SALIVA, BUT ONLY ONE CELL GROUP IS INVOLVED IN
PRODUCTION OF TEARS.
|