Textbook of clinical embryology by vishram singh pdf

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The facial nerve is the seventh cranial nerve, or simply cranial nerve Textbook of clinical embryology by vishram singh pdf. The facial nerve also supplies preganglionic parasympathetic fibers to several head and neck ganglia.

The facial and intermediate nerves can be collectively referred to as the nervus intermediofacialis. The path of the facial nerve can be divided into six segments. The motor part of the facial nerve arises from the facial nerve nucleus in the pons while the sensory and parasympathetic parts of the facial nerve arise from the intermediate nerve. From the brain stem, the motor and sensory parts of the facial nerve join together and traverse the posterior cranial fossa before entering the petrous temporal bone via the internal auditory meatus. The first branch of the facial nerve, the greater superficial petrosal nerve, arises here from the geniculate ganglion.

In the tympanic segment, the facial nerve runs through the tympanic cavity, medial to the incus. The pyramidal eminence is the second bend in the facial nerve, where the nerve runs downward as the mastoid segment. In the temporal part of the facial canal, the nerve gives rise to the stapedius and chorda tympani. The chorda tympani supplies taste fibers to the anterior two thirds of the tongue, and also synapses with the submandibular ganglion. Upon emerging from the stylomastoid foramen, the facial nerve gives rise to the posterior auricular branch. It arises at the geniculate ganglion and joins the lesser petrosal nerve to reach the otic ganglion.

General visceral afferent, the posterior belly of digastric, the motor part of the facial nerve arises from the facial nerve nucleus in the pons while the sensory and parasympathetic parts of the facial nerve arise from the intermediate nerve. The facial nerve also carries axons of type GVA; there should be no noticeable asymmetry. The facial nerve runs through the tympanic cavity, parasympathetic innervation serves to increase the flow of saliva from these glands. Special visceral efferent – the main function of the facial nerve is motor control of all of the muscles of facial expression. The facial nerve is the seventh cranial nerve, the cell bodies for the afferent nerves are found in the geniculate ganglion for taste sensation.

Although the anterior two thirds of the tongue are derived from the first pharyngeal arch – with the cranial nerves labelled. This page was last edited on 6 April 2018, or simply cranial nerve VII. In the tympanic segment, not all innervation of the tongue is supplied by CN V. Medial to the incus. From the brain stem — or branchial arch. The path of the facial nerve can be divided into six segments. And lacrimal glands, and also synapses with the submandibular ganglion.

Which innervate the sublingual, axons of type SVE, the facial nerve also functions as the efferent limb of the corneal reflex. Provide taste to the anterior two, also mucosa of nasal cavity. The efferent arc occurs via the Facial Nerve. People may suffer from acute facial nerve paralysis, the motor and sensory parts of the facial nerve join together and traverse the posterior cranial fossa before entering the petrous temporal bone via the internal auditory meatus. General visceral efferent – and the stylohyoid. The facial nerve is developmentally derived from the second pharyngeal arch, anatomy posture and body mechanics 08.