What is the main function of the glossopharyngeal?
The glossopharyngeal nerve is the ninth set of 12 cranial nerves (CN IX). It provides motor, parasympathetic and sensory information to your mouth and throat. Among its many functions, the nerve helps raise part of your throat, enabling swallowing.
What are the branches of the glossopharyngeal nerve?
The glossopharyngeal nerve carries sensory, efferent motor, and parasympathetic fibers. Its branches consist of tympanic, tonsillar, stylopharyngeal, carotid sinus nerve, branches to the tongue, lingual branches, and a communicating branch to cranial nerve X (vagus nerve).
Where is glossopharyngeal nucleus located?
Glossopharyngeal nerve is a mixed nerve that consists both of the motor and sensory fibers that rise from its nuclei. This nerve has altogether 4 nuclei that are located in the medulla oblongata: The ambiguous nucleus.
What is glossopharyngeal and vagus?
The glossopharyngeal and vagus cranial nerves provide the brainstem with sensory inputs from different receptors in the heart, lung, and vasculature. This afferent information is critical for the short-term regulation of arterial blood pressure and the buffering of emotional and physical stressors.
What does the glossopharyngeal innervate?
The glossopharyngeal nerve innervates taste discs located on the tongue and the facial nerve innervates taste discs of the smooth lining of the oral cavity (Osculati and Sbarbati, 1995).
What cranial nerve is glossopharyngeal?
CN IX
The glossopharyngeal nerve is the 9th cranial nerve (CN IX). It is one of the four cranial nerves that has sensory, motor, and parasympathetic functions.
How many branches does the glossopharyngeal nerve have?
The pharyngeal branches of the glossopharyngeal nerve are three or four filaments which unite, opposite the Constrictor pharyngis medius, with the pharyngeal branches of the vagus and sympathetic, to form the pharyngeal plexus.
What structure does the glossopharyngeal nerve innervate?
Is the glossopharyngeal nerve sensory or motor?
The glossopharyngeal nerve, which is also called the ninth cranial nerve, has both sensory (sensation) functions and motor (movement) functions in the body, as well as specialized sensory function and parasympathetic function.
Which nerve is responsible for the gag reflex?
The afferent limb of the reflex is supplied by the glossopharyngeal nerve (cranial nerve IX), which inputs to the nucleus solitarius and the spinal trigeminal nucleus. The efferent limb is supplied by the vagus nerve (cranial nerve X) from the nucleus ambiguus. All of these are located in the medulla.
What nerve is the gag reflex?
Which cranial nerve controls tongue?
Hypoglossal Nerve
The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII). It is mainly an efferent nerve for the tongue musculature. The nerve originates from the medulla and travels caudally and dorsally to the tongue.
Where does the glossopharyngeal nerve come from?
Sensory fibers arise from the carotid sinus and carotid body at the common carotid artery bifurcation, ascend in the carotid sinus nerve, and join the other components of CN IX at the inferior glossopharyngeal ganglion. The cell bodies of these neurons reside in the inferior glossopharyngeal ganglion.
What nerves innervate the tongue?
General sensation to the anterior two-thirds of the tongue is by innervation from the lingual nerve, a branch of the mandibular branch of the trigeminal nerve (CN V3). The lingual nerve is located deep and medial to the hyoglossus muscle and is associated with the submandibular ganglion.
What nerve Innervates the uvula?
Cranial Nerves IX (Glossopharyngeal) and X (Vagus)
Is the glossopharyngeal nerve afferent or efferent?
The glossopharyngeal nerve has five major components – special and general visceral efferent, general and special visceral afferent, and general somatic afferent.
What is the difference between a gyrus and a sulcus?
A brain ridge is known as a gyrus (plural: gyri) and an indentation or depression is a sulcus (plural: sulci) or fissure. Gyri and sulci give the brain its wrinkled appearance. The cerebral cortex, or the outer layer of the cerebrum, consists of gyri that are typically surrounded by one or more sulci.
What is the course of the glossopharyngeal nerve?
Course. It exits the medulla oblongata from the postolivary sulcus, the glossopharyngeal nerve passes laterally across the flocculus, and leaves the skull through the pars nervosa of the jugular foramen in a separate sheath of the dura mater. It then passes between the internal jugular vein and internal carotid artery.
What is the lingual gyrus of the brain?
Brain Gyri. Lingual Gyrus – convolution of the occipital lobe that is involved in visual processing. This gyrus is bordered by the calcarine sulcus and collateral sulcus. Anteriorly the lingual gyrus is contiuous with the parahippocampal gyrus and together they form the medial portion of the fusiform gyrus.
What are the gyri and sulci of the brain?
Gyri and Sulci of the Brain. The brain is divided into two cerebral hemispheres and is responsible for conscious thought, emotion and voluntary movement. The folds on its surface are known as gyri and the grooves are known as sulci.