The cervical plexus is a plexus of the ventral roots of the first four cervical spinal nerves which are located from C1 to C4 cervical segment near the neck. They are located laterally to the transverse processes between prevertebral muscles from the medial side and vertebral(m.scalenus,m.levator scapulae,m.splenius cervicis) from lateral side. Here there is anastomosis with n.accessorius, n.hypoglossus and sympathetic trunk.
It is located in the neck, deep to sternocleidomastoid. Nerves formed from the cervical plexus innerva ...
Its parasympathetic fibers reach the geniculate ganglion but do not synapse. Some of these preganglionic parasympathetic fibers persist within the greater petrosal nerve as they exit the geniculate ganglion and subsequently synapse with neurons in the pterygopalatine ganglion. These postganglionic neurons send axons that provide parasympathetic innervation to the lacrimal gland.
The remaining preganglionic fibers continue as the mixed facial nerve proper as it extends through the facial canal. Before the nerve exits the skull via the ...
The hypoglossal nucleus extends the length of the medulla, and being a motor nucleus, is close to the midline. In the open medulla, it is visible as what is known as the hypoglossal trigone, a raised area (medial to the vagal trigone) protuding slightly into the fourth ventricle.
In the closed medulla, the gracial and cuneate nuclei lie posteriorly, which means the nucleus is less close to th ...
