Frequent question: Which of the following nerves carry somatic motor fibers?

What structure carries somatic motor fibers?

The general (spinal) somatic efferent neurons (GSE, somatomotor, or somatic motor fibers), arise from motor neuron cell bodies in the ventral horns of the gray matter within the spinal cord. They exit the spinal cord through the ventral roots, carrying motor impulses to skeletal muscle through a neuromuscular junction.

Which cranial nerves carry somatic special motors?

Somatic motor (general somatic efferent) neurons.

Innervation is accomplished via the oculomotor, trochlear, abducens, and hypoglossal nerves (CNN III, IV, VI, and XII, respectively).

Which cranial nerves are somatic sensory?

Nerves in Order Modality
Trigeminal Branchial Motor General Sensory
Abducens Somatic Motor
Facial Branchial Motor Visceral Motor General Sensory Special Sensory
Vestibulocochlear Special Sensory

What nerve supplies somatic motor fibers to the lateral rectus muscle?

The abducens nerve provides motor innervation to only one extraocular muscle in humans, the ipsilateral lateral rectus muscle.

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What are the two main types of somatic motor pathways?

The somatic motor pathways of the brain and spinal cord are divided into pyramidal and extrapyramidal systems. Both these systems control the motor activities of body through lower motor neurons.

What is somatic structure?

Somatic Structures: a variety of “somatosensory receptors” scattered throughout the body can become activated by (sensory) input. The sensory information is then further processed as it progresses, via ascending sensory pathways, to the cerebral cortex. ( Patestas, 137)

Which cranial nerve is both sensory and motor?

The trigeminal nerve is the largest of your cranial nerves and has both sensory and motor functions.

Which cranial nerve is the largest?

The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards.

Which cranial nerves are responsible for Eye Movement?

Cranial nerves III (CNIII) (oculomotor), IV (trochlear), and VI (abducens) control the position of the eyeballs; CNIII influences the position of the eyelids and the size of the pupils.

What are sensory nerves give examples?

For example, the glossopharyngeal nerve has a role in both taste (sensory) and swallowing (motor). Spinal nerves transmit sensory and motor information between the spinal cord and the rest of the body. Each of the 31 spinal nerves (in humans) contains both sensory and motor axons.

What are sensory nerves examples?

Sensory neurons are the nerve cells that are activated by sensory input from the environment – for example, when you touch a hot surface with your fingertips, the sensory neurons will be the ones firing and sending off signals to the rest of the nervous system about the information they have received.

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What is somatic sensory pathway?

The somatosensory tracts (also referred to as the somatosensory system or somatosensory pathways) process information about somatic sensations such as pain, temperature, touch, position, and vibration. This information is received through receptors inside or at the surface of the body.

Which cranial nerve is the only one that extends beyond the head and neck?

Vagus nerve (CN X) is the only cranial nerve that innervates the structures beyond the head and neck region.

Which cranial nerve is sensory for smell?

The olfactory nerve (CN I) is the first and shortest cranial nerve. It is a special visceral afferent nerve, which transmits information relating to smell.

Which cranial nerve supplies somatic motor fibers to intrinsic muscles of tongue?


Term Olfactory Nerve (I) Definition Purely sensory, carries afferent impulses for sense of smell
Term Hypoglossal Nerve (XII) Definition Carries somatic motor fibers to intrinsic and extrinsic muscles of tongue. Allows food mixing and manipulation by the tongue and tongue movements involved in swallowing and speech